Clinical Approach to Headache

Pediatric Neurology Framework

1
Symptom Overview
Overview
2
Pathophysiology
Mechanism
3
History Taking
History
4
Physical Examination
Examination
5
Differential Diagnosis
Differential
6
Investigations
Workup
7
Clinical Decision-Making
Algorithm
8
Pearls and Pitfalls
Summary

1. Symptom Overview

Understanding the clinical significance and classification of pediatric headache

Headache is one of the most common neurological complaints in pediatric practice, affecting approximately 60% of children and adolescents at some point during childhood. By age 15, up to 75% of children will have experienced a significant headache. Headache accounts for approximately 1-2% of all pediatric emergency department visits and is among the top 10 reasons children are brought to primary care physicians. Migraine alone affects 3-10% of school-aged children and up to 28% of adolescents, with prevalence increasing with age. Chronic daily headache, defined as headache occurring 15 or more days per month, affects 1-2% of the pediatric population and significantly impacts school attendance, academic performance, and quality of life.

Definition

Headache is defined as pain or discomfort located in any region of the head, including the scalp, face, and interior of the cranium. In children, headache presentation varies considerably by age, with younger children often having difficulty localizing or describing their pain. Headache may be a primary disorder (such as migraine or tension-type headache) or secondary to an underlying condition (such as infection, trauma, or intracranial pathology). The developing nervous system in children means that headache patterns, presentation, and response to treatment may differ substantially from adults.

Key Epidemiology

Prevalence by age: 3-8% in preschoolers, 20% by age 5, 37-51% by age 7, and up to 82% by age 15
Gender distribution: Equal before puberty; female predominance (3:1) after puberty for migraine
Migraine prevalence: 1-3% of preschoolers, 4-11% of school-aged children, 8-28% of adolescents
Impact: Children with chronic headache miss an average of 7.8 school days per year
Family history: 70-90% of children with migraine have a first-degree relative with migraine

Classification by Duration

The temporal pattern of headache is one of the most important features in establishing a diagnosis. Unlike adults, pediatric chronic headache is typically defined as headache lasting more than 3 months, though many classification systems use frequency-based criteria.

Category	Duration/Frequency	Common Causes	Clinical Significance
Acute Single Episode	First or isolated headache; no prior history	Viral illness, sinusitis, febrile illness, head trauma, first migraine attack, serious intracranial pathology	Requires careful evaluation to rule out secondary causes; most commonly benign but highest risk for serious pathology
Acute Recurrent	Episodic headaches with symptom-free intervals; typically less than 15 days per month	Migraine (most common), tension-type headache, cluster headache (rare in children), episodic syndromes of childhood	Most consistent with primary headache disorders; pattern recognition is key to diagnosis
Chronic Progressive	Increasing frequency and/or severity over weeks to months	Intracranial mass, hydrocephalus, pseudotumor cerebri (idiopathic intracranial hypertension), subdural hematoma, brain abscess	Highest concern for serious secondary pathology; warrants urgent neuroimaging and evaluation
Chronic Non-Progressive	15 or more days per month for more than 3 months; stable pattern	Chronic migraine, chronic tension-type headache, new daily persistent headache, medication overuse headache	Once secondary causes excluded, focus shifts to lifestyle factors, psychological comorbidities, and medication overuse
Acute Emergency	Sudden severe onset (thunderclap) reaching maximum intensity within seconds to minutes	Subarachnoid hemorrhage, arteriovenous malformation rupture, venous sinus thrombosis, pituitary apoplexy, hypertensive crisis	Medical emergency requiring immediate evaluation and often neuroimaging; “worst headache of life” is a red flag

Classification by Character

Primary Headache Features

Migraine characteristics in children:

Often bilateral and frontotemporal (unlike adult unilateral pattern)
Shorter duration (1-72 hours; may be as brief as 30 minutes in young children)
Pulsating or throbbing quality
Associated nausea, vomiting, photophobia, phonophobia
Pallor is common; child often appears ill
Relief with sleep is characteristic
Aura present in 15-30% (visual most common)

Tension-Type Headache Features

Characteristics in children:

Bilateral, pressing or tightening (non-pulsating) quality
Mild to moderate intensity
Not aggravated by routine physical activity
No nausea or vomiting (mild nausea may occur)
Photophobia OR phonophobia may be present, but not both
“Band-like” or “hat-like” distribution
Often occurs later in the day or after school

Classification by Pattern and Timing

Pattern	Description	Suggests
Morning headache with vomiting	Headache present upon awakening, often with nausea or vomiting that may relieve the headache	Elevated intracranial pressure (tumor, hydrocephalus, pseudotumor cerebri); also consider obstructive sleep apnea
Weekend or vacation headache	Headache occurring during periods of relaxation after stressful periods	Migraine (let-down headache); caffeine withdrawal in adolescents
Late afternoon/evening headache	Headache developing or worsening as the day progresses	Tension-type headache; eyestrain; school-related stress
Headache with fever	Headache accompanying systemic illness with temperature elevation	Viral or bacterial infection; meningitis must be considered if fever plus neck stiffness, altered mental status, or petechial rash
Headache triggered by exertion, cough, or Valsalva	Headache provoked by physical activity, straining, coughing, or bending	Chiari malformation; intracranial lesion; primary exertional headache (diagnosis of exclusion)
Headache with position change	Headache that changes significantly with lying down versus standing	Worse supine: elevated intracranial pressure; Worse upright: low cerebrospinal fluid pressure (post-lumbar puncture, spontaneous leak)
School-day only headache	Headache occurring exclusively on school days, absent on weekends and holidays	School avoidance; anxiety; stress-related; bullying; also consider refractive errors or screen time issues
Monthly pattern in adolescent females	Headache occurring predictably in relation to menstrual cycle	Menstrual migraine; typically occurs 2 days before to 3 days after onset of menses
Nocturnal headache awakening from sleep	Headache severe enough to wake the child from sleep	Elevated intracranial pressure; cluster headache (rare in children); hypnic headache (very rare in pediatrics)

Age-Specific Considerations

Age Group	Presentation Characteristics	Common Causes	Special Considerations
Infants and Toddlers (0-3 years)	Unable to verbalize; irritability, head holding, head banging, vomiting, changes in sleep or feeding patterns	Intracranial pathology (hemorrhage, hydrocephalus, tumor), infection, trauma (including non-accidental)	Primary headache rare in this age group; any concern for headache requires thorough evaluation for secondary causes
Preschool (3-5 years)	May localize pain but often poorly; behavioral changes, decreased activity, sleep disruption	Migraine beginning to appear, viral illness, sinusitis, dental issues	Migraine may present as abdominal pain (abdominal migraine) or cyclic vomiting in this age group
School Age (6-12 years)	Better able to describe headache features; may minimize or exaggerate depending on context	Migraine, tension-type headache, post-concussive headache, refractive errors	School performance and attendance become important markers; bullying and academic stress common triggers
Adolescents (13-18 years)	Adult-like descriptions; increasing migraine prevalence especially in females	Migraine (including menstrual), chronic daily headache, medication overuse headache, substance use	Autonomy and adherence issues; screen time, sleep deprivation, caffeine, and stress all common factors; psychiatric comorbidities increase

Episodic Syndromes of Childhood Associated with Migraine

These conditions are considered precursors or variants of migraine and often evolve into typical migraine in later childhood or adolescence.

Syndrome	Typical Age	Key Features	Significance
Cyclic Vomiting Syndrome	3-7 years	Recurrent stereotypical episodes of intense nausea and vomiting lasting hours to days; completely well between episodes	Strong association with migraine; up to 75% develop migraine later
Abdominal Migraine	3-10 years	Recurrent episodes of midline abdominal pain lasting 1-72 hours; associated with nausea, vomiting, pallor; headache-free	Most children develop migraine headaches by adulthood
Benign Paroxysmal Vertigo of Childhood	2-4 years	Sudden brief episodes of vertigo with pallor and unsteadiness; child appears frightened; normal between episodes	Considered migraine precursor; often evolves into typical migraine
Benign Paroxysmal Torticollis of Infancy	First year of life	Recurrent episodes of head tilt with or without vomiting, pallor, or irritability; spontaneously resolves	Earliest migraine precursor; usually resolves by age 3-5 years

Key Concept: The Importance of Temporal Pattern

In pediatric headache, the temporal pattern is the single most important feature for guiding initial evaluation and determining urgency. Remember:

Chronic progressive headache (worsening over time) warrants urgent neuroimaging regardless of other features
Acute recurrent headache with symptom-free intervals is most consistent with primary headache disorders
Thunderclap headache (sudden severe onset reaching maximum intensity within seconds) is a medical emergency
The pattern often matters more than pain intensity in determining the need for urgent investigation

2. Pathophysiology and Mechanisms

Understanding the underlying mechanisms of pediatric headache

Understanding the pathophysiology of headache is essential for both diagnosis and treatment. The brain parenchyma itself is insensitive to pain, but several structures within and surrounding the cranium contain nociceptors and can generate the sensation of headache. In children, the developing nervous system may respond differently to pain stimuli than in adults, and certain conditions (such as posterior fossa tumors) may present earlier due to the smaller intracranial volume and more limited compensatory mechanisms.

Pain-Sensitive Structures

Headache arises from activation of nociceptors in pain-sensitive structures. Understanding these structures helps explain why different pathologies produce different headache patterns.

Intracranial Pain-Sensitive Structures

Dura mater (especially basal dura)
Dural arteries (middle meningeal artery)
Large cerebral arteries (circle of Willis)
Venous sinuses (especially superior sagittal sinus)
Falx cerebri and tentorium cerebelli
Proximal portions of cranial nerves with sensory components

Extracranial Pain-Sensitive Structures

Scalp (skin, subcutaneous tissue, muscles)
Periosteum of skull
Extracranial arteries (temporal, occipital)
Paranasal sinuses and mucosa
Teeth and temporomandibular joint
Eyes (cornea, iris, ciliary body)
Ears (tympanic membrane, middle ear)
Cervical nerve roots (C1-C3)

The Trigeminovascular System

The trigeminovascular system is the primary pathway for transmitting head pain and plays a central role in the pathophysiology of migraine and other primary headache disorders.

Component	Structure	Function
Peripheral Nociceptors	Free nerve endings of trigeminal nerve (CN V) in meninges and cerebral blood vessels	Detect mechanical, thermal, and chemical stimuli; release vasoactive neuropeptides (calcitonin gene-related peptide, substance P)
Primary Afferent Neurons	Cell bodies in trigeminal ganglion (Gasserian ganglion)	Transmit pain signals from peripheral structures to brainstem
Trigeminocervical Complex	Trigeminal nucleus caudalis extending to C1-C3 spinal cord dorsal horn	First central relay station; convergence of trigeminal and cervical input explains referred pain patterns
Ascending Pathways	Trigeminothalamic tracts projecting to thalamus (ventral posteromedial nucleus)	Relay pain information to higher cortical centers for conscious perception
Cortical Processing	Somatosensory cortex, insular cortex, anterior cingulate cortex	Conscious perception of pain; emotional and affective components of headache experience
Descending Modulation	Periaqueductal gray, rostral ventromedial medulla, locus coeruleus	Endogenous pain modulation; dysfunction may lead to central sensitization and chronic headache

Mechanisms of Primary Headache

Migraine Pathophysiology

Migraine is now understood as a complex neurovascular disorder involving cortical, brainstem, and trigeminal pathways. The understanding of migraine mechanisms has evolved significantly, moving away from the purely “vascular” theory.

Phase	Mechanism	Clinical Correlation
Premonitory Phase (Prodrome)	Hypothalamic and brainstem activation; dopaminergic and serotonergic changes	Mood changes, food cravings, yawning, fatigue, neck stiffness occurring hours to days before headache
Aura Phase	Cortical spreading depression: a wave of neuronal depolarization followed by suppression spreading across cortex at 2-3 mm/min	Visual, sensory, or language symptoms lasting 5-60 minutes; typically precedes headache
Headache Phase	Activation of trigeminovascular system; release of calcitonin gene-related peptide (CGRP) and other neuropeptides; neurogenic inflammation; peripheral and central sensitization	Throbbing head pain; cutaneous allodynia; photophobia, phonophobia, osmophobia; nausea and vomiting
Postdrome Phase	Gradual recovery of cortical and brainstem function; residual inflammatory changes	Fatigue, cognitive difficulties, mood changes lasting hours to days after headache resolution

Calcitonin Gene-Related Peptide (CGRP)

Location: Released from trigeminal nerve terminals in meninges and blood vessels

Role: Potent vasodilator; promotes neurogenic inflammation; levels elevated during migraine attacks

Clinical relevance: CGRP monoclonal antibodies are emerging as preventive treatments for pediatric migraine

Serotonin (5-HT)

Location: Brainstem raphe nuclei; widespread cortical projections

Role: Modulates pain transmission; levels decrease during migraine; implicated in triggering attacks

Clinical relevance: Triptans act as 5-HT1B/1D agonists; basis for acute migraine treatment

Dopamine

Location: Hypothalamus, substantia nigra, ventral tegmental area

Role: Hypersensitivity in migraineurs; involved in prodromal symptoms and associated symptoms

Clinical relevance: Explains nausea, vomiting, yawning; basis for antiemetic use in acute treatment

Pediatric-Specific Mechanisms

Developmental Considerations in Pediatric Headache

The developing nervous system in children has several unique features that affect headache presentation and pathophysiology:

Incomplete myelination: May explain bilateral headache pattern in young children (pain pathways less lateralized)
Higher brain water content: Different response to changes in intracranial pressure
Open fontanelles and sutures (infants): Can partially compensate for increased intracranial pressure, delaying symptom onset
Smaller intracranial volume: Less reserve; posterior fossa tumors present earlier in children than adults
Immature descending pain modulation: May contribute to central sensitization and chronic headache development
Higher metabolic rate: Greater vulnerability to hypoglycemia, dehydration, and sleep deprivation as triggers

How Conditions Cause Headache

Condition	Mechanism	Clinical Implication
Migraine	Cortical spreading depression triggers trigeminovascular activation; CGRP release causes neurogenic inflammation and vasodilation; central sensitization develops	Abortive treatment most effective when given early before central sensitization; preventive therapy aims to raise threshold for cortical spreading depression
Tension-Type Headache	Peripheral: myofascial tenderness from pericranial muscle contraction; Central: impaired descending pain modulation and central sensitization in chronic cases	Acute treatment with simple analgesics; chronic cases benefit from amitriptyline (affects central pain processing)
Elevated Intracranial Pressure (Tumor, Hydrocephalus)	Traction and compression of pain-sensitive dura, blood vessels, and cranial nerves; stretching of meninges	Progressive headache pattern; worse with Valsalva and position; requires urgent neuroimaging and treatment of underlying cause
Pseudotumor Cerebri (Idiopathic Intracranial Hypertension)	Elevated cerebrospinal fluid pressure without mass lesion; impaired cerebrospinal fluid absorption or increased production; papilledema from optic nerve sheath distension	Common in obese adolescent females; acetazolamide reduces cerebrospinal fluid production; weight loss essential; monitor vision closely
Meningitis	Inflammation of meninges; release of inflammatory mediators; stimulation of dural nociceptors; increased intracranial pressure from cerebral edema	Headache with fever, neck stiffness, photophobia; medical emergency requiring rapid diagnosis and antibiotic treatment
Sinusitis	Inflammation and mucosal swelling obstruct sinus drainage; negative pressure or positive pressure from purulent material stimulates sinus wall nociceptors	Facial pain/pressure over affected sinus; worse with bending forward; treatment includes antibiotics if bacterial, decongestants, and nasal steroids
Post-Traumatic (Concussion)	Mechanical injury to brain causes ionic flux, metabolic dysfunction, and neuroinflammation; microstructural axonal damage; disruption of neurotransmitter systems	Headache most common post-concussion symptom; cognitive and physical rest initially; gradual return to activity; persistent headache may require preventive treatment
Chiari Malformation Type I	Cerebellar tonsil herniation through foramen magnum; compression of brainstem and upper cervical cord; disruption of cerebrospinal fluid flow; traction on pain-sensitive structures	Occipital headache triggered by Valsalva, cough, or exertion; requires MRI of brain and cervical spine; surgical decompression if symptomatic
Medication Overuse Headache	Frequent analgesic or triptan use leads to upregulation of pain pathways; suppression of endogenous pain modulation; central sensitization becomes self-perpetuating	Paradoxical increase in headache frequency; defined as analgesic use 15 or more days/month or triptan use 10 or more days/month; treatment requires withdrawal of offending medication
Arteriovenous Malformation	Abnormal arteriovenous shunting causes vascular steal; may cause hemorrhage with sudden severe headache; dural arteriovenous fistulas cause venous hypertension	Hemorrhage presents as thunderclap headache; requires urgent neuroimaging; treatment may include embolization, surgery, or radiosurgery

Central Sensitization and Chronic Headache

Central sensitization is a key mechanism in the transformation from episodic to chronic headache and is particularly important in understanding chronic daily headache in adolescents.

Peripheral Sensitization

Lowered threshold of peripheral nociceptors
Increased response to stimuli
Spontaneous activity of nociceptors
Clinically: tenderness of scalp and pericranial muscles during and between headaches

Central Sensitization

Increased excitability of central neurons in trigeminal nucleus caudalis
Expansion of receptive fields
Cutaneous allodynia (pain from non-painful stimuli)
Impaired descending pain modulation
Clinically: difficulty brushing hair, wearing glasses, or lying on pillow during headache

Often Overlooked Mechanism: The Role of Sleep in Pediatric Headache

Sleep and headache have a bidirectional relationship that is particularly important in children and adolescents:

Hypothalamic involvement: The hypothalamus regulates both sleep-wake cycles and is implicated in migraine generation; dysfunction may explain sleep disturbances as both trigger and symptom of migraine
Glymphatic clearance: The brain’s waste clearance system is most active during sleep; disrupted sleep may impair clearance of inflammatory mediators that contribute to headache
Melatonin: Secreted by the pineal gland; involved in sleep regulation and has analgesic properties; levels may be abnormal in chronic headache patients
Sleep disorders: Obstructive sleep apnea, restless legs syndrome, and sleep bruxism can all cause or worsen headaches in children
Clinical pearl: Always assess sleep patterns in pediatric headache patients; sleep hygiene interventions can significantly reduce headache frequency without medication

Referred Pain and Convergence

The concept of referred pain is important for understanding why pathology in one location can cause pain in another area of the head.

Source of Pathology	Referred Pain Location	Mechanism
Upper cervical spine (C1-C3)	Occipital region, radiating to frontal area	Convergence of cervical and trigeminal afferents at trigeminocervical complex
Posterior fossa structures	Occipital and upper cervical region	Innervation by upper cervical nerves (C1-C3) and vagus nerve
Supratentorial structures	Frontal, temporal, parietal regions (anterior to ear)	Innervation by trigeminal nerve (primarily V1 ophthalmic division)
Eye pathology	Frontal, orbital, and periorbital pain	Trigeminal innervation of cornea, iris, ciliary body (V1)
Temporomandibular joint	Temporal and periauricular region	Trigeminal innervation (V3 mandibular division)

3. History Taking

A comprehensive approach to eliciting the pediatric headache history

Red Flags — Require Urgent Evaluation

Thunderclap headache — Sudden severe onset reaching maximum intensity within seconds (subarachnoid hemorrhage, arteriovenous malformation rupture)
Progressive worsening pattern — Increasing frequency and/or severity over weeks (intracranial mass, hydrocephalus)
Headache awakening from sleep — Especially with vomiting (elevated intracranial pressure)
Morning headache with vomiting — Vomiting may temporarily relieve headache (posterior fossa tumor, hydrocephalus)
Headache with fever and neck stiffness — (Meningitis, encephalitis)
New neurological signs — Focal deficits, ataxia, personality change, seizures (intracranial pathology)

Headache triggered by Valsalva, cough, or exertion — (Chiari malformation, intracranial lesion)
Age less than 5 years with new headache — Primary headache uncommon; higher index of suspicion for secondary causes
Papilledema on examination — (Elevated intracranial pressure regardless of cause)
Recent head trauma — Especially with altered mental status or worsening symptoms (intracranial hemorrhage)
Immunocompromised child — (Opportunistic infection, malignancy)
Headache with visual changes — Diplopia, vision loss, visual obscurations (pseudotumor cerebri, optic pathway lesion)
Occipital location in young child — Posterior fossa pathology more common in children

Systematic History: The “HEADACHE” Approach

Use the mnemonic “HEADACHE” to ensure comprehensive history taking in pediatric patients:

H — How did it start and how has it changed? Onset pattern (sudden vs gradual), temporal evolution (stable, worsening, improving), first ever vs recurrent
E — Episode details: Frequency, duration of each episode, time of day, warning signs (aura, prodrome)
A — Attributes of pain: Location, quality (throbbing, pressing, stabbing), severity (0-10 scale, functional impact), unilateral vs bilateral
D — Disability and daily impact: School absences, missed activities, sleep disruption, mood changes, family impact
A — Associated symptoms: Nausea, vomiting, photophobia, phonophobia, visual changes, dizziness, neck stiffness, fever
C — Causes and triggers: Stress, sleep changes, foods, weather, menses, screens, physical activity, specific situations
H — History (medical, family, medications): Past medical history, developmental history, family history of headache/migraine, current medications, medication trials
E — Environment and psychosocial: School performance, peer relationships, bullying, family stressors, anxiety, depression screening

Characterizing the Headache Pattern

The temporal pattern is the most important feature for determining urgency and narrowing the differential diagnosis.

Pattern	Description	Key Questions	Likely Category
Acute Single	First or isolated severe headache	“Is this the first bad headache ever? How quickly did it reach maximum intensity?”	Requires evaluation for secondary causes; may be first migraine
Acute Recurrent	Episodes with pain-free intervals	“Between headaches, are you completely normal? How many headaches per month?”	Primary headache (migraine, tension-type)
Chronic Progressive	Worsening over time	“Is each headache worse than the last? Is the headache becoming more frequent?”	Secondary cause — requires urgent imaging
Chronic Non-Progressive	Daily or near-daily, stable	“How many days per month do you NOT have a headache? Has the pattern been stable?”	Chronic migraine, chronic tension-type, medication overuse, new daily persistent headache

Targeted Questions by Suspected Cause

Suspected Cause	Key Features	Ask This Question
Migraine	Episodic, throbbing, associated symptoms, family history, relief with sleep	“Does your child look pale or sick during headaches? Do they want to lie down in a dark, quiet room? Does sleep help? Does anyone else in the family have bad headaches?”
Tension-Type Headache	Bilateral pressing/tightening, mild-moderate, no significant associated symptoms	“Does the headache feel like a tight band around the head? Can your child continue activities during the headache? Does it get worse as the day goes on?”
Elevated Intracranial Pressure	Progressive, worse in morning or supine, vomiting, visual changes	“Is the headache worse when waking up? Does vomiting make it better? Any double vision or vision changes? Is the headache worse when coughing, straining, or bending over?”
Pseudotumor Cerebri (Idiopathic Intracranial Hypertension)	Obese adolescent female, daily headache, visual symptoms, pulsatile tinnitus	“Have you noticed any brief blackouts of vision, especially when bending or standing? Do you hear a whooshing sound in your ears? Any recent weight gain?”
Chiari Malformation	Occipital headache, triggered by cough/Valsalva/exertion	“Does coughing, sneezing, laughing, or straining make the headache worse? Is the pain mainly in the back of the head or neck?”
Sinusitis	Facial pain/pressure, nasal congestion, purulent discharge, worse bending forward	“Is there pain or pressure over the cheeks or forehead? Is there thick colored mucus from the nose? Is the pain worse when bending forward?”
Medication Overuse Headache	Daily headache in patient using analgesics frequently	“How often does your child take pain medicine for headaches? More than 2-3 times per week? Does the headache come back as soon as the medicine wears off?”
Post-Concussion Headache	Headache following head injury, cognitive symptoms, vestibular symptoms	“Was there any head injury, even a minor one, before the headaches started? Any difficulty concentrating, memory problems, or dizziness?”
Meningitis	Fever, neck stiffness, photophobia, ill appearance, rash	“Is there fever? Does it hurt to bend the neck forward? Is your child sensitive to light? Any rash, especially spots that don’t blanch?”
Carbon Monoxide Exposure	Multiple family members affected, worse at home, improves away from home	“Does anyone else in the house have headaches? Does the headache get better when you’re away from home? Do you have gas appliances?”
Refractive Error/Eye Strain	Frontal headache, worse with reading or screens, squinting	“Does your child squint when reading or watching TV? Is the headache worse after school or screen time? When was the last eye exam?”
Temporomandibular Dysfunction	Jaw pain, teeth grinding, clicking jaw, temporal headache	“Any jaw pain or clicking? Does your child grind their teeth at night? Is there pain with chewing?”

Pediatric-Specific History Components

Birth and Developmental History

Important for identifying underlying neurological conditions that may present with headache.

Gestational age and birth weight: Prematurity increases risk of hydrocephalus, periventricular leukomalacia
Birth complications: Hypoxic-ischemic injury, intraventricular hemorrhage
Developmental milestones: Any delays or regression (suggests underlying neurological condition)
Head circumference trajectory: Rapid head growth may indicate hydrocephalus
Previous neuroimaging: Any prior brain MRI or CT scans

School and Social History

Essential for understanding impact and identifying psychosocial contributors.

School attendance: Number of days missed due to headache
Academic performance: Any recent decline
Bullying or social difficulties: Common headache triggers
Extracurricular activities: Impact on participation
Screen time: Duration and timing (especially before bed)
Sleep schedule: Bedtime, wake time, sleep quality, weekend vs weekday differences

Family History

Migraine has strong genetic component; family history is often positive.

Migraine or “sick headaches”: Present in 70-90% of children with migraine (first-degree relatives)
Other headache disorders: Tension-type, cluster
Motion sickness: Associated with migraine
Neurological conditions: Brain tumors, aneurysms, arteriovenous malformations
Psychiatric conditions: Anxiety, depression (comorbid with chronic headache)

Adolescent-Specific History (HEADSS)

For adolescents, screen for risk factors affecting headache and overall health.

Home: Family stressors, living situation
Education/Employment: School performance, job stress
Activities: Peers, extracurriculars, screen time
Drugs: Caffeine, alcohol, cannabis, other substances
Sexuality: Relationship stress; pregnancy (affects treatment)
Suicide/Safety: Depression and anxiety screening; chronic headache increases risk

Medication and Substance History

Medications That Can Cause or Worsen Headache

Analgesic overuse: Acetaminophen, ibuprofen, combination analgesics used more than 15 days/month
Triptan overuse: Used more than 10 days/month
Stimulants: Methylphenidate, amphetamines (for ADHD)
Oral contraceptives: Estrogen-containing (may worsen migraine with aura)
Isotretinoin: Can cause pseudotumor cerebri
Tetracyclines: Doxycycline, minocycline (pseudotumor cerebri)
Corticosteroids: Both use and withdrawal
Vitamin A excess: Pseudotumor cerebri
Growth hormone: Can cause intracranial hypertension

Substances and Lifestyle Factors

Caffeine: Both excess intake and withdrawal; common in adolescents (energy drinks, coffee)
Alcohol: Can trigger migraine; adolescent substance use
Cannabis: Increasingly common in adolescents; can cause or relieve headache
Nicotine/Vaping: Can trigger headache
Dehydration: Inadequate fluid intake, especially in active children
Skipped meals: Hypoglycemia is common trigger
Sleep deprivation: Major trigger in adolescents
Excessive screen time: Blue light, posture, eye strain

Previous Treatment History

Category	Questions to Ask	Why It Matters
Acute Treatments Tried	Which medications? What dose? How early in headache? Response?	Many “treatment failures” are due to inadequate dose or delayed administration
Preventive Medications	Which medications? Duration of trial? Maximum dose reached? Side effects?	Adequate trial requires 2-3 months at therapeutic dose; many trials are too short
Non-Pharmacological Treatments	Biofeedback? Cognitive behavioral therapy? Acupuncture? Physical therapy?	Evidence-based non-drug options important in pediatrics
Emergency Department Visits	How many? What treatments given? Response to IV medications?	Frequent ED visits suggest need for better preventive strategy
Supplements Tried	Magnesium? Riboflavin? Coenzyme Q10? Melatonin?	May have evidence for migraine prevention; assess before recommending

Clinical Pearl: The Headache Diary

A headache diary is invaluable for both diagnosis and monitoring treatment response. Recommend that families track:

Date and time of each headache
Duration
Severity (1-10 scale)
Location and quality
Associated symptoms
Potential triggers (stress, foods, sleep, weather, menses)
Medications taken and response
Impact (school missed, activities affected)

Review at least 4 weeks of diary before making treatment decisions. Apps like “Migraine Buddy” can make tracking easier for adolescents.

Collateral History from Parents/Caregivers

In pediatric practice, obtaining history from both the child and caregiver is essential. Key observations that parents may provide:

Observation	Significance
Pallor during headache	Characteristic of migraine; child “looks sick”
Behavior changes before headache	Prodromal symptoms — irritability, food cravings, yawning
Retreating to dark room	Photophobia — supports migraine diagnosis
Sleep provides relief	Very characteristic of migraine
Personality or behavior changes	May indicate intracranial pathology; also consider psychiatric comorbidity
Change in school performance	May indicate cognitive impact of chronic headache or underlying pathology
Coordination problems or clumsiness	May indicate posterior fossa pathology or cerebellar involvement
Head tilt	May indicate posterior fossa tumor, fourth nerve palsy, or torticollis

4. Physical Examination

A systematic head-to-toe approach for pediatric headache

Systematic Framework: Use the “Head to Extremities” approach for complete examination of children presenting with headache. The neurological examination is the cornerstone, but a thorough general examination is essential to identify secondary causes.

General Inspection

Appearance: Well or ill-appearing; toxic appearance suggests serious infection
Level of consciousness: Alert, drowsy, confused, or obtunded (altered mental status is a red flag)
Posture and position: Preference for lying still (migraine) vs restless (cluster); neck stiffness; head tilt
Pallor: Characteristic of migraine attack; also consider anemia
Pain behavior: Holding head, rubbing temples, avoiding light
Growth parameters: Plot height and weight; obesity relevant for pseudotumor cerebri; failure to thrive may indicate chronic illness
Dysmorphic features: May suggest genetic syndrome associated with structural brain abnormalities
Skin: Café-au-lait spots (neurofibromatosis), port-wine stain (Sturge-Weber), ash-leaf spots (tuberous sclerosis), petechial rash (meningococcemia)

Vital Signs

Age Group	Heart Rate (bpm)	Respiratory Rate (/min)	Systolic BP (mmHg)	Temperature
Infant (0-12 months)	100-160	30-60	70-90	36.5-37.5°C
Toddler (1-3 years)	90-150	24-40	80-100	36.5-37.5°C
Preschool (3-5 years)	80-140	22-34	85-105	36.5-37.5°C
School Age (6-12 years)	70-120	18-30	90-115	36.5-37.5°C
Adolescent (13-18 years)	60-100	12-20	100-130	36.5-37.5°C

Vital Sign Abnormality	What to Look For	Clinical Significance
Fever	Temperature greater than 38°C	Infectious cause — viral illness, sinusitis, meningitis; always consider meningitis if fever with headache and neck stiffness
Hypertension	BP above 95th percentile for age, sex, and height	Can cause headache directly; also seen with elevated intracranial pressure (Cushing reflex); screen for renovascular causes
Bradycardia with hypertension	Cushing triad (bradycardia, hypertension, irregular respirations)	Late sign of severely elevated intracranial pressure — impending herniation; emergency
Tachycardia	Heart rate above normal for age	Pain response, anxiety, fever, dehydration, anemia; consider hyperthyroidism
Oxygen desaturation	SpO2 less than 95% on room air	Hypoxia can cause headache; consider sleep apnea if history of morning headaches

Head Examination

Inspection and Palpation

Head circumference: Measure and plot on growth chart; macrocephaly may indicate hydrocephalus
Fontanelle (infants): Bulging suggests elevated intracranial pressure; sunken suggests dehydration
Scalp: Tenderness, swelling, signs of trauma; temporal artery tenderness (rare in children, but consider in adolescents)
Palpate skull: Bony tenderness, step-off deformity (trauma)
Signs of trauma: Bruising, lacerations; periorbital ecchymosis (“raccoon eyes”) or mastoid bruising (“Battle sign”) suggest basilar skull fracture
Ventricular shunt: If present, palpate for reservoir filling and emptying; consider shunt malfunction

Sinus Examination

Inspection: Facial swelling, periorbital edema or erythema (suggests orbital complication of sinusitis)
Palpation: Tenderness over frontal and maxillary sinuses
Percussion: Pain with percussion over sinuses
Transillumination: Limited utility in children; opacification suggests sinusitis
Note: Frontal sinuses not fully developed until age 7-8 years; ethmoid and maxillary sinuses present from birth

Eye Examination

The fundoscopic examination is critical in pediatric headache evaluation for detecting papilledema.

Component	Examination Technique	Abnormal Findings and Significance
Visual Acuity	Age-appropriate chart (Snellen, LEA symbols, HOTV)	Decreased acuity may indicate optic nerve involvement or need for corrective lenses (eye strain headaches)
Visual Fields	Confrontation testing; formal perimetry if abnormal	Field cuts suggest intracranial lesion; enlarged blind spot with pseudotumor cerebri
Pupils	Size, symmetry, reactivity to light (direct and consensual), accommodation	Anisocoria with poor reactivity suggests third nerve palsy (herniation); Horner syndrome (cluster headache, carotid dissection)
Extraocular Movements	Test in all directions of gaze; check for nystagmus	Sixth nerve palsy (elevated ICP — false localizing sign); third or fourth nerve palsy (brainstem lesion); nystagmus (cerebellar or vestibular pathology)
Fundoscopy	Dilated examination preferred; look at disc margins, vessels, macula	Papilledema: Blurred disc margins, absent venous pulsations, hemorrhages, elevated disc — indicates elevated intracranial pressure. Optic atrophy: Pale disc — chronic elevation or previous optic neuritis
Conjunctival Injection	Inspect for redness, tearing	Ipsilateral injection and tearing with headache suggests trigeminal autonomic cephalalgia (cluster headache, rare in children)

Recognizing Papilledema

Papilledema is swelling of the optic disc due to elevated intracranial pressure and is a critical finding requiring urgent evaluation.

Early signs: Hyperemia of disc, blurring of superior and inferior disc margins, loss of spontaneous venous pulsations
Moderate: Elevation of disc, obscuration of blood vessels crossing disc margin, circumferential blurring
Severe: Marked elevation, hemorrhages and exudates, obscuration of major vessels
Key point: Presence of papilledema requires urgent neuroimaging before lumbar puncture
Pediatric challenge: Fundoscopy can be difficult in young children; consider referral to ophthalmology if unable to visualize disc adequately

Ear, Nose, and Throat Examination

Ears: Otoscopy for otitis media (can cause referred headache); mastoid tenderness (mastoiditis)
Nose: Nasal mucosa (congestion, polyps); septal deviation; purulent discharge (sinusitis)
Throat: Pharyngitis, tonsillar enlargement; dental examination for caries or abscess
Temporomandibular joint: Palpate for tenderness and crepitus; observe jaw opening for deviation; note malocclusion

Neck Examination

Component	Technique	Abnormal Findings
Meningeal Signs	Passive neck flexion; Kernig sign (resistance to knee extension with hip flexed); Brudzinski sign (involuntary hip flexion with neck flexion)	Nuchal rigidity, positive Kernig or Brudzinski — meningeal irritation (meningitis, subarachnoid hemorrhage)
Range of Motion	Active flexion, extension, rotation, lateral flexion	Limited range — cervicogenic headache, muscle spasm, atlantoaxial instability (consider in Down syndrome)
Cervical Spine Palpation	Palpate spinous processes and paraspinal muscles	Tenderness over occiput-C1-C2 — cervicogenic headache; midline tenderness — consider fracture if trauma history
Lymphadenopathy	Palpate anterior and posterior cervical chains	Enlarged nodes suggest infection or malignancy
Thyroid	Palpate for enlargement, nodules	Hyperthyroidism can cause headache

Neurological Examination

A thorough neurological examination is essential in every child presenting with headache. Any focal abnormality requires urgent investigation.

Mental Status

Level of consciousness: Alert, lethargic, obtunded, comatose
Orientation: Person, place, time (age-appropriate)
Attention: Months of year backward; serial 7s in older children
Memory: Immediate recall, short-term memory
Language: Spontaneous speech, naming, comprehension, repetition
Behavior: Appropriate for age; note any personality changes reported by parents

Cranial Nerves

Cranial Nerve	Test	Headache-Relevant Abnormalities
II (Optic)	Visual acuity, visual fields, fundoscopy	Papilledema, optic atrophy, field cuts
III, IV, VI (Oculomotor, Trochlear, Abducens)	Extraocular movements, pupil responses	Diplopia; sixth nerve palsy (false localizing sign of elevated ICP); third nerve palsy with pupil involvement (aneurysm, herniation)
V (Trigeminal)	Facial sensation, corneal reflex, muscles of mastication	Sensory loss suggests trigeminal lesion; jaw weakness suggests brainstem involvement
VII (Facial)	Facial symmetry, eye closure, smile	Facial weakness — brainstem lesion, Bell’s palsy; can be associated with headache
VIII (Vestibulocochlear)	Hearing (finger rub, whisper); vestibular testing if indicated	Hearing loss with vertigo — cerebellopontine angle lesion; vestibular migraine
IX, X (Glossopharyngeal, Vagus)	Gag reflex, palate elevation, voice quality	Bulbar weakness — brainstem lesion
XI (Accessory)	Shoulder shrug, head turn against resistance	Weakness suggests spinal accessory involvement
XII (Hypoglossal)	Tongue protrusion, observe for atrophy/fasciculations	Deviation to weak side; suggests brainstem or nerve lesion

Motor Examination

Bulk: Symmetric muscle mass; atrophy suggests chronic denervation
Tone: Hypotonia or hypertonia; spasticity suggests upper motor neuron lesion
Strength: Test major muscle groups; grade 0-5; pronator drift is sensitive for subtle weakness
Abnormal movements: Tremor, chorea, dystonia

Cerebellar Examination

Gait: Observe walking; tandem gait (heel-to-toe); wide-based or ataxic gait suggests cerebellar pathology
Coordination: Finger-nose-finger, heel-shin, rapid alternating movements
Romberg test: Standing with feet together, eyes closed; positive if marked unsteadiness
Nystagmus: Cerebellar lesions often cause nystagmus toward lesion side

Posterior Fossa Tumors in Children

Posterior fossa tumors are more common in children than adults and may present with headache. Key examination findings include:

Gait ataxia — often the earliest sign; child may appear clumsy or have frequent falls
Truncal ataxia — inability to sit unsupported (midline cerebellar lesion)
Dysmetria and intention tremor — finger-nose testing
Head tilt — may be compensation for diplopia or sign of tonsillar herniation
Papilledema — from obstructive hydrocephalus
Sixth nerve palsy — from elevated intracranial pressure

Sensory Examination

Light touch: Test major dermatomes
Pain/temperature: Pin prick testing
Proprioception: Toe/finger position sense
Vibration: Tuning fork at bony prominences

Reflexes

Deep tendon reflexes: Biceps, triceps, brachioradialis, patellar, Achilles; grade 0-4
Plantar response: Upgoing toe (Babinski sign) is abnormal after infancy — indicates upper motor neuron lesion
Clonus: Sustained clonus (>3 beats) suggests upper motor neuron pathology
Primitive reflexes: Should be absent after infancy; persistence suggests neurological dysfunction

Expected Findings by Etiology

Condition	General Examination	Neurological Findings	Key Diagnostic Clues
Migraine	Pallor during attack; well between episodes	Usually entirely normal; may have mild photophobia	Normal examination despite severe symptoms; history is key
Tension-Type Headache	May have pericranial muscle tenderness	Normal	Palpate temporalis, frontalis, trapezius for tenderness
Brain Tumor	May be well-appearing early; later may have weight loss, fatigue	Papilledema, focal deficits depending on location, gait ataxia (posterior fossa)	Progressive symptoms, morning headache, neurological signs
Hydrocephalus	Increased head circumference (infants); “sunset sign” (eyes deviated downward)	Papilledema, sixth nerve palsy, upgaze palsy, hyperreflexia	Macrocephaly; bulging fontanelle in infants
Pseudotumor Cerebri	Often obese; otherwise well-appearing	Papilledema (bilateral); may have sixth nerve palsy; otherwise normal	Obese adolescent female with papilledema and normal imaging
Meningitis	Ill-appearing, febrile, may have petechial rash	Nuchal rigidity, positive Kernig/Brudzinski, photophobia, altered mental status	Fever + headache + neck stiffness = meningitis until proven otherwise
Subarachnoid Hemorrhage	May be ill-appearing or initially well	Nuchal rigidity (may develop hours after onset), focal deficits variable, altered consciousness	Thunderclap headache with nuchal rigidity
Chiari Malformation Type I	Usually well-appearing	May have nystagmus (downbeat), lower cranial nerve signs, long tract signs, cerebellar signs	Occipital headache triggered by Valsalva; may be asymptomatic
Sinusitis	May have fever, nasal congestion, purulent discharge	Normal neurological examination	Facial tenderness over sinuses; worse with bending
Post-Concussion	Usually well-appearing; may have visible injury	Often normal; may have subtle cognitive deficits, balance disturbance	History of head injury; vestibular and cognitive testing may be abnormal

Important Teaching Point

Normal examination is common! The majority of children with headache will have an entirely normal physical and neurological examination. This is particularly true for:

Migraine — normal examination is the rule between attacks
Tension-type headache — may only have pericranial tenderness
Post-concussion headache — often normal on standard examination
Medication overuse headache — examination typically normal

A normal examination does not exclude significant pathology, but in the context of a reassuring history (acute recurrent pattern, family history of migraine, symptom-free intervals), it supports a diagnosis of primary headache disorder. Conversely, any focal neurological abnormality in a child with headache warrants urgent investigation.

Age-Specific Examination Considerations

Age Group	Special Examination Considerations	Red Flag Signs
Infants (0-12 months)	Measure head circumference; assess fontanelle (bulging, sunken, or normal); check for “sunset sign”; primitive reflexes; observe feeding	Bulging fontanelle, accelerating head growth, irritability, poor feeding, developmental regression
Toddlers (1-3 years)	Observe gait and play; assess for head tilt; parental report of behavior changes is crucial	New gait abnormality, head tilt, regression of milestones, persistent vomiting
Preschool (3-5 years)	Can cooperate with basic neurological examination; may need games to assess coordination	Behavior or personality change, clumsiness, balance problems, school readiness concerns
School Age (6-12 years)	Can perform full neurological examination; assess cognition and school performance	Declining school performance, personality change, focal signs, papilledema
Adolescents (13-18 years)	Full adult-type examination; screen for depression/anxiety; assess for substance use	Same as adult red flags; consider pregnancy; screen for medication overuse

5. Differential Diagnosis

Systematic approach organized by probability, temporal pattern, and clinical features

The differential diagnosis of pediatric headache is guided primarily by the temporal pattern of symptoms. The vast majority of children with headache have primary headache disorders (migraine or tension-type headache), but secondary causes must be systematically considered and excluded, particularly in younger children and those with red flag features.

Key Principle: In pediatric headache, always consider:

Is this a primary or secondary headache? — History and examination guide this determination
What is the temporal pattern? — Acute, acute recurrent, chronic progressive, or chronic non-progressive
Are there any red flags? — If yes, secondary causes must be excluded before diagnosing primary headache
What is the child’s age? — Primary headache is less common in children under 5 years

Acute Headache (First or Worst Episode)

A child presenting with a first severe headache or “worst headache ever” requires careful evaluation to exclude serious secondary causes.

Probability	Condition	Key Features	Red Flags
COMMON (approximately 75-80%)	Viral illness/Systemic infection	Fever, malaise, myalgias, upper respiratory symptoms; headache diffuse and mild-moderate	High fever with neck stiffness, petechial rash, altered mental status
	First migraine attack	Severe, throbbing; nausea/vomiting; photophobia; family history positive; child appears ill, pallor	Thunderclap onset, focal neurological deficits persisting after headache
	Acute sinusitis	Facial pain/pressure; nasal congestion; purulent discharge; worse bending forward; following upper respiratory infection	Periorbital swelling/erythema, high fever, visual changes (orbital complication)
	Post-traumatic headache	History of head injury; may have associated dizziness, cognitive symptoms	Loss of consciousness, worsening symptoms, focal deficits, vomiting, skull fracture signs
LESS COMMON (approximately 15-20%)	Bacterial meningitis	Fever, severe headache, neck stiffness, photophobia, ill appearance; may have petechial rash	All features are red flags — medical emergency
	Viral meningitis/Encephalitis	Fever, headache, neck stiffness (less severe than bacterial); may have altered mental status with encephalitis	Altered mental status, seizures, focal deficits
	Hypertensive crisis	Severe headache with markedly elevated blood pressure; may have visual changes, encephalopathy	Severely elevated BP, altered mental status, seizures, visual loss
UNCOMMON BUT SERIOUS (approximately 5%)	Intracranial hemorrhage	Sudden severe headache (thunderclap); may have altered consciousness, focal deficits; often history of trauma or vascular malformation	Thunderclap onset, altered consciousness, focal deficits — emergency
	Arteriovenous malformation rupture	Sudden severe headache; may have seizure, focal deficits; often no prior warning	Thunderclap headache, neurological deficits — emergency
	Cerebral venous sinus thrombosis	Headache (often progressive), may have seizures, focal deficits; risk factors include dehydration, infection, prothrombotic states	Seizures, papilledema, focal deficits
	Acute hydrocephalus	Severe headache, vomiting, altered consciousness; may be due to shunt malfunction or new obstruction	Altered consciousness, vomiting, papilledema — emergency
	Carbon monoxide poisoning	Headache affecting multiple household members; flu-like symptoms; may have altered consciousness	Multiple affected individuals, altered mental status, winter months

Acute Recurrent Headache (Episodic with Pain-Free Intervals)

This pattern is most consistent with primary headache disorders. The key is to identify the headache type and assess for secondary causes if atypical features are present.

Probability	Condition	Approximate Frequency	Key Distinguishing Features
COMMON (approximately 85-90%)	Migraine without aura	60-70% of primary pediatric headache	Episodic; moderate-severe; often bilateral in children; throbbing; nausea/vomiting; photophobia/phonophobia; pallor; relief with sleep; family history positive in 70-90%
COMMON (approximately 85-90%)	Tension-type headache	20-25% of primary pediatric headache	Bilateral; pressing/tightening; mild-moderate; no nausea; may have photophobia OR phonophobia but not both; can continue activities; often later in day
LESS COMMON (approximately 8-12%)	Migraine with aura	15-30% of children with migraine	Visual aura most common (scintillating scotoma, fortification spectra); sensory or language aura possible; aura lasts 5-60 minutes and precedes headache
	Episodic syndromes of childhood	Variable; often young children	Cyclic vomiting, abdominal migraine, benign paroxysmal vertigo, benign paroxysmal torticollis — considered migraine precursors
	Recurrent sinusitis	5-10%	Facial pain/pressure with upper respiratory infections; nasal symptoms; may be mistaken for migraine
	Temporomandibular dysfunction	5-10% of adolescents	Temporal/periauricular pain; jaw clicking; teeth grinding; pain with chewing; often associated with stress/bruxism
UNCOMMON (approximately 2-5%)	Cluster headache	Rare before puberty; less than 1% of pediatric headache	Severe unilateral orbital/temporal pain; autonomic features (tearing, rhinorrhea, ptosis, miosis); attacks 15-180 minutes; circadian pattern; male predominance
	Trigeminal autonomic cephalalgias (other)	Very rare in children	Paroxysmal hemicrania, SUNCT/SUNA, hemicrania continua — very rare before adulthood
	Primary stabbing headache (ice-pick headache)	Uncommon	Brief (seconds) stabbing pains; variable location; often in children with migraine

Chronic Progressive Headache

This is the most concerning temporal pattern and warrants urgent investigation for secondary causes, particularly space-occupying lesions.

Chronic Progressive Headache = Red Flag

A headache that is progressively worsening over weeks to months requires urgent neuroimaging, regardless of other features. This pattern is uncommon in primary headache disorders and suggests an expanding intracranial process.

Condition	Key Features	Associated Findings	Urgency
Brain tumor	Progressive headache; may be worse in morning; worse with Valsalva; vomiting (may relieve headache initially)	Focal neurological deficits; papilledema; personality change; seizures; posterior fossa tumors cause ataxia	URGENT — same-day imaging
Hydrocephalus	Progressive headache; vomiting; may have gait disturbance; in infants: increasing head circumference, bulging fontanelle	Papilledema; sixth nerve palsy; upgaze palsy (“setting sun” sign); hyperreflexia	URGENT — same-day imaging
Pseudotumor cerebri (Idiopathic intracranial hypertension)	Daily headache; visual obscurations; pulsatile tinnitus; most common in obese adolescent females	Papilledema (bilateral); sixth nerve palsy; visual field defects; normal imaging except for signs of elevated pressure	URGENT — within days; ophthalmology assessment for vision
Chronic subdural hematoma	Progressive headache following head trauma (may be minor/forgotten); personality change; fluctuating symptoms	Focal deficits possible; may have subtle personality/cognitive changes	URGENT — same-day imaging
Brain abscess	Progressive headache; may have fever; history of sinusitis, otitis, dental infection, or congenital heart disease	Focal deficits; fever; elevated inflammatory markers	URGENT — same-day imaging
Cerebral venous sinus thrombosis	Progressive headache; may have seizures; risk factors: dehydration, infection, hypercoagulable state, oral contraceptives	Papilledema; focal deficits; seizures	URGENT — same-day imaging (MRV)
Chiari malformation (symptomatic)	Progressive occipital headache; may be triggered by cough/Valsalva; may have neck pain	Nystagmus; lower cranial nerve signs; long tract signs; syringomyelia symptoms	URGENT — MRI brain and cervical spine

Chronic Non-Progressive (Daily or Near-Daily) Headache

Step-by-Step Approach to Chronic Daily Headache:

Step 1: Confirm pattern is truly non-progressive — if any features suggest worsening, treat as chronic progressive
Step 2: Rule out medication overuse headache — present in up to 30% of adolescents with chronic daily headache
Step 3: Consider secondary causes — pseudotumor cerebri, Chiari malformation, cervicogenic headache
Step 4: Classify primary chronic daily headache — chronic migraine, chronic tension-type, or new daily persistent headache
Step 5: Assess comorbidities — depression, anxiety, sleep disorders are common and impact treatment

Probability	Condition	Diagnostic Criteria	Key Features
COMMON (approximately 60-70%)	Chronic migraine	Headache 15 or more days per month for more than 3 months; at least 8 days with migraine features	Evolution from episodic migraine; retains some migraine features (nausea, photophobia); often medication overuse coexists
COMMON (approximately 60-70%)	Chronic tension-type headache	Headache 15 or more days per month for more than 3 months; bilateral, pressing, mild-moderate	Often evolves from episodic tension-type; pericranial tenderness common; fewer associated symptoms than migraine
LESS COMMON (approximately 20-30%)	Medication overuse headache	Headache 15 or more days per month; regular overuse of acute headache medication for more than 3 months	Analgesics more than 15 days/month OR triptans/combination analgesics more than 10 days/month; headache worsens despite treatment; improves after withdrawal
LESS COMMON (approximately 20-30%)	New daily persistent headache	Daily headache from onset; patient can pinpoint exact date of onset; continuous from within 24 hours	Often follows viral illness, stressful event, or surgery; no prior headache history; can have migraine or tension-type features; often refractory to treatment
MUST EXCLUDE	Pseudotumor cerebri	Elevated intracranial pressure; papilledema; normal brain imaging	Obese adolescent female; visual symptoms; pulsatile tinnitus; must do fundoscopy and consider lumbar puncture
MUST EXCLUDE	Chronic post-traumatic headache	Headache developing within 7 days of head injury; persisting more than 3 months	History of concussion/head injury; associated cognitive, vestibular, mood symptoms

Anatomical Approach to Headache Etiology

Intracranial — Parenchymal

Brain tumor

Brain abscess

Intracranial hemorrhage

Arteriovenous malformation

Encephalitis

Demyelinating disease

Intracranial — Extra-Axial/Vascular

Meningitis

Subarachnoid hemorrhage

Subdural hematoma

Epidural hematoma

Hydrocephalus

Cerebral venous thrombosis

Pseudotumor cerebri

Craniocervical Junction/Spine

Chiari malformation

Atlantoaxial instability

Cervicogenic headache

CSF leak (low pressure)

Occipital neuralgia

Extracranial

Sinusitis

Otitis media/mastoiditis

Dental pathology

Temporomandibular dysfunction

Refractive errors

Acute glaucoma (rare in children)

Age-Based Differential Considerations

Age Group	More Likely Diagnoses	Special Considerations
Infants (0-12 months)	Hydrocephalus, intracranial hemorrhage, meningitis, non-accidental trauma, congenital malformations	Primary headache very rare; any concern for headache requires thorough evaluation; open fontanelle may mask elevated ICP initially
Toddlers (1-3 years)	Viral illness, meningitis/encephalitis, brain tumors (especially posterior fossa), hydrocephalus, migraine beginning	May present with behavioral changes, irritability, head holding rather than verbal complaint; posterior fossa tumors common at this age
Preschool (3-5 years)	Migraine (including abdominal migraine), viral illness, sinusitis, brain tumors	Migraine variants (cyclic vomiting, abdominal migraine) may be more common than classic headache presentation
School Age (6-12 years)	Migraine, tension-type headache, post-concussive headache, sinusitis, refractive errors	School-related stress and bullying common triggers; screen time and sleep issues; evaluate vision
Adolescents (13-18 years)	Migraine (including menstrual), chronic daily headache, medication overuse, tension-type, pseudotumor cerebri, post-concussive	Medication overuse increasingly common; caffeine and sleep deprivation major factors; psychiatric comorbidities; substance use; consider pregnancy

Drug-Induced and Substance-Related Headache

Agent	Mechanism	Characteristics	Management
Analgesic overuse (acetaminophen, NSAIDs)	Central sensitization; alteration of pain pathways with chronic use	Dull, constant headache; present upon waking; use more than 15 days per month	Gradual or abrupt withdrawal; bridge therapy; preventive medication
Triptan overuse	Receptor downregulation; rebound phenomenon	Migraine-like features; use more than 10 days per month	Withdrawal with bridge therapy; start preventive
Caffeine withdrawal	Adenosine receptor upregulation; rebound vasodilation	Bilateral throbbing headache; 12-24 hours after last caffeine; common in adolescents with energy drink use	Gradual caffeine reduction; education about hidden sources
Oral contraceptives (estrogen-containing)	Estrogen fluctuations; may increase stroke risk in migraine with aura	New-onset headache or worsening of existing migraine; headache during hormone-free week	Consider progestin-only or non-hormonal contraception; migraine with aura is contraindication to estrogen
Stimulants (methylphenidate, amphetamines)	Vasoconstriction; dopamine/norepinephrine effects	Headache during medication effect or as wearing off	Dose adjustment; timing modification; alternative ADHD medication
Isotretinoin	Can cause pseudotumor cerebri (idiopathic intracranial hypertension)	Progressive headache; visual symptoms; papilledema	Stop isotretinoin; ophthalmology evaluation; treat pseudotumor
Tetracyclines (doxycycline, minocycline)	Can cause pseudotumor cerebri	Progressive headache; visual symptoms; papilledema	Stop medication; evaluate and treat pseudotumor
Corticosteroid withdrawal	Adrenal suppression; rebound intracranial pressure changes	Headache during steroid taper; may be severe	Slower taper; symptomatic treatment
Cannabis	Variable — may cause or relieve headache; withdrawal can trigger headache	Increasing use in adolescents; both intoxication and withdrawal associated	Cessation; education about risks
Nitrates (recreational “poppers”)	Potent vasodilation	Immediate severe headache with use	Cessation of use

Quick Reference: “If You See This, Think This”

Clinical Clue	Think This First	Next Step
Thunderclap headache (maximum intensity in seconds)	Subarachnoid hemorrhage, arteriovenous malformation rupture	Emergency CT head; if negative, lumbar puncture
Progressive worsening over weeks	Brain tumor, hydrocephalus, chronic subdural	Urgent MRI brain with contrast
Morning headache with vomiting	Elevated intracranial pressure (tumor, hydrocephalus)	Urgent neuroimaging; fundoscopy
Headache worse with cough, strain, exertion	Chiari malformation; intracranial mass	MRI brain and cervical spine
Obese adolescent female with daily headache and visual symptoms	Pseudotumor cerebri	Fundoscopy; MRI/MRV; lumbar puncture with opening pressure
Headache with fever and neck stiffness	Meningitis	Emergency evaluation; lumbar puncture (after imaging if focal signs or papilledema)
Headache with ataxia in young child	Posterior fossa tumor	Urgent MRI brain
Daily headache with frequent analgesic use	Medication overuse headache	Headache diary review; withdrawal strategy
Headache after head injury with persistent symptoms	Post-concussion syndrome; if worsening — intracranial hemorrhage	CT if acute/worsening; management of post-concussion symptoms
Episodic severe headache with pallor, vomiting, relief with sleep, family history positive	Migraine	Clinical diagnosis; no imaging if typical history and normal examination
School-day only headache, absent on weekends	Tension-type headache; school avoidance; anxiety; bullying	Psychosocial assessment; vision check; school evaluation
Recurrent abdominal pain with vomiting in young child, well between episodes	Abdominal migraine; cyclic vomiting syndrome	Evaluate for other causes; consider migraine family history

6. Diagnostic Investigations

A stepwise, evidence-based approach guided by clinical suspicion

Key Principle: The vast majority of children with headache do not require neuroimaging or laboratory investigations. Investigations should be guided by clinical findings, not routine practice. A thorough history and examination are the most important diagnostic tools.

Indications for Neuroimaging

Neuroimaging is indicated when clinical features suggest an increased likelihood of secondary pathology.

When to Image — Red Flag Indications

Urgent/Emergent Imaging:

Thunderclap headache
Altered mental status
Focal neurological deficits
Papilledema
Signs of increased intracranial pressure
Meningeal signs (after stabilization)
Recent significant head trauma with concerning features
Suspicion of shunt malfunction

Non-Urgent Imaging (outpatient):

Chronic progressive headache pattern
Headache triggered by Valsalva/cough/exertion
New headache in child under 5 years
Change in established headache pattern
Occipital headache in young child
Headache awakening from sleep
Abnormal neurological examination
Atypical aura (prolonged, motor, brainstem)

Choosing the Right Imaging Modality

Modality	Advantages	Disadvantages	Best Indications
CT Head (non-contrast)	Fast; readily available; excellent for acute hemorrhage, hydrocephalus, large masses; no sedation usually needed	Ionizing radiation (particular concern in children); poor posterior fossa visualization; limited soft tissue detail	Emergency situations: suspected hemorrhage, acute trauma, acute hydrocephalus, shunt malfunction
CT Head (with contrast)	Better tumor visualization than non-contrast; faster than MRI	Radiation; contrast risks; still inferior to MRI for most lesions	When MRI unavailable and tumor/abscess suspected
MRI Brain (without contrast)	No radiation; excellent soft tissue detail; superior posterior fossa imaging; detects most pathology	Longer scan time; may require sedation in young children; less available; cost	Non-urgent evaluation of concerning headache; evaluation for Chiari malformation
MRI Brain (with gadolinium contrast)	Best for tumor characterization; infection; inflammation; meningeal disease	Longer scan; sedation often needed; contrast risks (rare); cost	Suspected tumor, abscess, meningeal disease, post-contrast enhancement needed
MRA (Magnetic Resonance Angiography)	Non-invasive vascular imaging; no radiation	May miss small aneurysms; longer scan	Suspected vascular malformation, aneurysm, arterial dissection
MRV (Magnetic Resonance Venography)	Evaluates venous sinuses; non-invasive	Longer scan	Suspected cerebral venous sinus thrombosis; pseudotumor cerebri workup
CT Angiography	Fast; good vascular detail; often available urgently	Radiation; IV contrast; less detail than conventional angiography	Emergency vascular evaluation when MRA not feasible

Pediatric Imaging Considerations

Radiation exposure: Children are more sensitive to radiation effects; prefer MRI when non-urgent; use lowest CT dose protocols (ALARA principle)
Sedation: Children under 6-7 years often require sedation for MRI; this adds risk and requires appropriate monitoring and NPO status
Motion artifact: Shorter sequences and child-friendly preparation can reduce need for sedation
Feed and wrap technique: Infants may be imaged during natural sleep after feeding
Gadolinium in children: Generally safe; avoid in renal impairment; newer agents have better safety profile

Lumbar Puncture

Lumbar puncture (LP) is indicated for specific clinical scenarios and should not be routine in headache evaluation.

Indication	Key CSF Findings	Important Considerations
Suspected meningitis	Bacterial: elevated WBC (neutrophil predominant), elevated protein, low glucose; Viral: elevated WBC (lymphocyte predominant), normal/mildly elevated protein, normal glucose	Do NOT delay antibiotics for LP if bacterial meningitis suspected; image first if focal signs, papilledema, or altered consciousness
Suspected subarachnoid hemorrhage (CT negative)	Xanthochromia; elevated RBC count that does not clear in sequential tubes	LP should be done 6-12 hours after headache onset to allow xanthochromia development
Suspected pseudotumor cerebri	Elevated opening pressure (greater than 28 cm H2O in children, greater than 25 cm H2O in non-obese adults); normal CSF composition	Perform after normal brain imaging (MRI/MRV preferred); measure opening pressure in lateral decubitus position with legs extended
Suspected CNS infection (encephalitis, chronic meningitis)	Variable depending on etiology; send for appropriate cultures, PCR, cytology	Consider additional studies: HSV PCR, enterovirus PCR, fungal studies, TB studies based on clinical context

Contraindications to Lumbar Puncture

Signs of elevated intracranial pressure with risk of herniation: Papilledema, altered consciousness, focal neurological deficits, posterior fossa signs — image first
Coagulopathy: Correct before procedure if possible
Infection at puncture site
Spinal cord abnormality at puncture level

Remember: In suspected bacterial meningitis, do not delay antibiotics to obtain imaging or LP — treat empirically and obtain cultures when possible.

Laboratory Investigations

Laboratory tests are not routinely indicated for primary headache but may be helpful in specific clinical scenarios.

Clinical Scenario	Recommended Tests	What to Look For
Fever with headache	Complete blood count, blood cultures, inflammatory markers (CRP, ESR)	Leukocytosis, bandemia, elevated inflammatory markers suggest infection
Suspected anemia	Complete blood count, reticulocyte count, iron studies	Hemoglobin less than 10 g/dL may cause headache; consider menstruating adolescents
Hypertension with headache	Basic metabolic panel, urinalysis, renal ultrasound if significant hypertension	Evaluate for renal causes of secondary hypertension
Suspected thyroid disorder	TSH, free T4	Both hypo- and hyperthyroidism can cause headache
Suspected carbon monoxide exposure	Carboxyhemoglobin level	Elevated levels confirm exposure; levels may normalize rapidly
Suspected cerebral venous thrombosis	D-dimer (may be normal); thrombophilia workup if confirmed	Factor V Leiden, prothrombin mutation, protein C/S, antithrombin III, antiphospholipid antibodies
Chronic daily headache workup	Consider: TSH, complete blood count, inflammatory markers	Rule out systemic causes; often normal in primary headache
Adolescent female — before starting preventive treatment	Pregnancy test	Many preventive medications are teratogenic (valproate, topiramate)

Ophthalmological Evaluation

When to Refer to Ophthalmology

Papilledema seen or suspected on fundoscopy
Visual symptoms (transient visual obscurations, vision loss, diplopia)
Unable to adequately visualize optic disc
Suspected pseudotumor cerebri
Suspected optic nerve pathology
Need for formal visual field testing

Optometry/Vision Evaluation

Suspected refractive error (frontal headache, worse with reading/screens)
Routine vision screening overdue
Squinting or difficulty with near/far vision
Convergence insufficiency evaluation

Targeted Investigations by Suspected Etiology

If Suspecting Migraine

Investigation Needed

Usually none: Migraine is a clinical diagnosis based on history
Headache diary: Most useful “investigation” — track frequency, triggers, response to treatment

When to Consider Imaging

Atypical features (first presentation with prolonged aura, motor/brainstem symptoms)
Change in established headache pattern
Abnormal neurological examination
Family or patient anxiety despite reassurance (discuss shared decision-making)

If Suspecting Elevated Intracranial Pressure (Tumor, Hydrocephalus)

First-Line Tests

MRI brain with contrast: Preferred imaging; best sensitivity for mass lesions
CT head: If MRI not immediately available or in emergency; good for hydrocephalus, hemorrhage
Fundoscopy: Look for papilledema

Additional Studies

MRI spine: If CNS tumor confirmed (staging for drop metastases)
Tumor markers: AFP, beta-HCG for suspected germ cell tumors
Lumbar puncture: For CSF cytology if leptomeningeal disease suspected (only after ruling out herniation risk)

If Suspecting Pseudotumor Cerebri (Idiopathic Intracranial Hypertension)

First-Line Tests

MRI brain with MRV: To exclude mass lesion and venous thrombosis; may show empty sella, flattened posterior globe, distended optic nerve sheath
Fundoscopy: Papilledema is hallmark finding
Formal visual field testing: Baseline and for monitoring

Confirmatory Test

Lumbar puncture with opening pressure: Opening pressure greater than 28 cm H2O in children (lateral decubitus, legs extended); normal CSF composition required for diagnosis
Optical coherence tomography (OCT): Quantifies optic nerve head swelling for monitoring

If Suspecting Chiari Malformation

Required Imaging

MRI brain and cervical spine: Demonstrates tonsillar herniation (greater than 5 mm below foramen magnum); evaluates for syringomyelia

Additional Studies if Symptomatic

CSF flow study (cine MRI): Evaluates CSF dynamics at craniocervical junction
Sleep study: If sleep apnea symptoms present
Full spine MRI: If syringomyelia present

If Suspecting Meningitis

Immediate Tests

Blood cultures: Before antibiotics if possible, but do not delay treatment
Lumbar puncture: CSF cell count, glucose, protein, Gram stain, culture; viral PCR panel
Complete blood count, inflammatory markers, metabolic panel

When to Image Before LP

Focal neurological deficits
Altered level of consciousness
Papilledema
Recent seizure
Immunocompromised patient
Note: Do NOT delay antibiotics for imaging — give empiric treatment first

Empiric Treatment Trials as Diagnostic Tools

Using Treatment Response to Support Diagnosis

In some cases, response to specific treatments can help support or exclude certain diagnoses. However, this approach should be used thoughtfully:

Triptan response in suspected migraine: Relief with sumatriptan or other triptan supports migraine diagnosis; however, triptans may also help tension-type headache and some secondary headaches
Indomethacin response: Complete resolution with indomethacin strongly supports hemicrania continua or paroxysmal hemicrania (rare in children)
Medication withdrawal in suspected medication overuse headache: Improvement after 2-3 months of withdrawal supports this diagnosis
Treatment of suspected sinusitis: Resolution with antibiotics and decongestants supports diagnosis; persistent symptoms despite treatment suggest alternative etiology

When NOT to Investigate

Unnecessary investigations can increase anxiety, expose children to radiation, and lead to incidental findings requiring further workup.

Imaging is Generally NOT Indicated When:

Classic episodic migraine pattern with family history and normal examination
Tension-type headache pattern with normal examination
Stable, non-progressive headache pattern
Acute headache clearly related to viral illness that resolves
Headache improving with appropriate treatment
Previous normal imaging within reasonable timeframe with unchanged clinical picture

Key point: A normal neurological examination in a child with typical primary headache features has a very high negative predictive value for serious intracranial pathology.

Summary: Investigation Algorithm

Clinical Scenario	Recommended Investigation	Urgency
Thunderclap headache	CT head (non-contrast) → LP if CT negative	EMERGENCY
Headache with fever, neck stiffness	LP (after imaging if focal signs); blood cultures	EMERGENCY
Altered mental status with headache	CT head → MRI; consider LP	EMERGENCY
Focal neurological deficits	MRI brain with contrast (CT if MRI delayed)	URGENT
Papilledema	MRI brain with MRV → LP with opening pressure	URGENT
Chronic progressive headache	MRI brain with contrast	URGENT (within days)
Valsalva/cough-triggered headache	MRI brain and cervical spine	SOON (within weeks)
New headache in child under 5 years	Consider MRI brain; low threshold for imaging	SOON (within weeks)
Typical migraine, normal examination	None required; headache diary	NOT INDICATED
Tension-type headache, normal examination	None required	NOT INDICATED

7. Clinical Decision-Making

Practical algorithms and decision pathways for pediatric headache

Step 1: Is This Urgent?

The first priority in evaluating any child with headache is to determine the urgency of the situation. Use this triage table to guide immediate management.

Clinical Scenario	Urgency Level	Immediate Action
Thunderclap headache (sudden severe onset reaching maximum intensity within seconds)	EMERGENT	Stabilize; urgent CT head; if negative, lumbar puncture; neurosurgery consultation if hemorrhage found
Altered mental status with headache (confusion, lethargy, obtundation)	EMERGENT	Stabilize airway/breathing; urgent CT head; treat empirically for infection if febrile; neurology/neurosurgery consultation
Headache with fever and meningeal signs (neck stiffness, photophobia, Kernig/Brudzinski positive)	EMERGENT	Blood cultures; empiric antibiotics IMMEDIATELY (do not delay for LP); LP after imaging if focal signs; dexamethasone consideration
New focal neurological deficit with headache	EMERGENT	Urgent neuroimaging (CT if MRI delayed); neurology consultation; consider stroke protocol in appropriate cases
Signs of herniation (Cushing triad: bradycardia, hypertension, irregular breathing; pupil changes; posturing)	EMERGENT	Emergency airway management; elevate head of bed; hyperventilation; mannitol/hypertonic saline; emergent neurosurgery
Suspected shunt malfunction (patient with VP shunt; headache, vomiting, lethargy)	EMERGENT	Urgent CT head (compare to baseline); shunt series X-rays; neurosurgery consultation
Papilledema on fundoscopy	URGENT	Same-day MRI/MRV if available; ophthalmology consultation; if tumor/hemorrhage excluded, lumbar puncture with opening pressure
Chronic progressive pattern (worsening over weeks)	URGENT	MRI brain with contrast within 24-48 hours; do not reassure without imaging
Severe migraine not responding to usual treatment (status migrainosus)	URGENT	IV hydration; IV antiemetics (prochlorperazine, metoclopramide); IV ketorolac; consider IV magnesium, dihydroergotamine, or valproate
Typical recurrent headache pattern with normal examination, known migraine	ROUTINE	Acute treatment optimization; headache diary; consider preventive therapy if frequent; reassurance
Chronic stable headache (daily but non-progressive, normal examination)	ROUTINE	Evaluate for medication overuse; address lifestyle factors; consider preventive therapy; screen for anxiety/depression

Step 2: Classify by Temporal Pattern

Once immediate emergencies are excluded, classify the headache pattern to guide further evaluation and management.

Acute Single Episode

Duration: First or isolated severe headache

Key questions:

How quickly did it reach maximum intensity?
Any fever or signs of infection?
Any recent trauma?
Any neurological symptoms?

Proceed to: Algorithm A

Acute Recurrent

Duration: Episodic with pain-free intervals; less than 15 days per month

Key questions:

Frequency and duration of episodes?
Associated symptoms (nausea, photophobia)?
Family history of migraine?
Triggers identified?

Proceed to: Algorithm B

Chronic Progressive

Duration: Increasing frequency and/or severity over weeks to months

Key questions:

Worse in morning or with position change?
Associated vomiting?
Any neurological symptoms or signs?
Behavior or personality changes?

Proceed to: Algorithm C (REQUIRES IMAGING)

Chronic Non-Progressive

Duration: 15 or more days per month for more than 3 months; stable pattern

Key questions:

Analgesic/triptan use frequency?
Sleep, stress, mood assessment?
Impact on school and activities?
Previous preventive trials?

Proceed to: Algorithm D

Step 3: Follow the Appropriate Algorithm

Algorithm A: Acute Single Episode

Clinical Scenario	Most Likely Diagnosis	Action
Sudden onset, “worst headache ever,” maximum intensity in seconds	Subarachnoid hemorrhage until proven otherwise	Emergency CT → LP if CT negative → Neurosurgery if hemorrhage confirmed
Fever, neck stiffness, ill appearance	Meningitis	Empiric antibiotics immediately; LP (after imaging if focal signs); admit
Recent head trauma with persistent headache, vomiting, or altered mental status	Intracranial hemorrhage or concussion	CT head; neurosurgery if hemorrhage; concussion management if CT normal
Fever with mild headache, upper respiratory symptoms, well-appearing	Viral illness	Supportive care; return precautions for worsening; no imaging needed
Severe headache with nausea, photophobia, pallor, family history positive, child appears ill	First migraine attack	Acute migraine treatment; if typical features and normal examination, imaging not required; education and follow-up
Facial pain/pressure, nasal congestion, purulent discharge	Acute sinusitis	Antibiotics if bacterial criteria met; decongestants; follow-up if not improving

Algorithm B: Acute Recurrent (Episodic) Headache

Clinical Scenario	Most Likely Diagnosis	Action
Moderate-severe episodes; throbbing; nausea/vomiting; photophobia/phonophobia; relief with sleep; family history positive	Migraine without aura	Headache diary; optimize acute treatment (NSAIDs, triptans if appropriate); lifestyle modifications; preventive therapy if 4 or more attacks per month
Above features preceded by visual symptoms (zigzag lines, scotoma) lasting 5-60 minutes	Migraine with aura	Same as above; avoid estrogen-containing contraceptives; educate about aura versus stroke symptoms
Bilateral, pressing/tightening; mild-moderate; no nausea; continues activities; worse later in day	Tension-type headache	Lifestyle modifications; stress management; simple analgesics; consider amitriptyline if frequent
Recurrent abdominal pain with nausea/vomiting; pallor; well between episodes; young child	Abdominal migraine	Exclude GI pathology if not previously done; treat as migraine variant; may evolve to typical migraine
Recurrent vertigo episodes with unsteadiness; pallor; normal between; toddler/preschool	Benign paroxysmal vertigo of childhood	Reassurance; exclude other causes if atypical; usually self-resolving; migraine precursor
Brief episodes of severe unilateral pain with autonomic features (tearing, rhinorrhea, ptosis)	Cluster headache or other trigeminal autonomic cephalalgia (rare in children)	Oxygen for acute cluster; verapamil prevention; neurology referral for diagnosis confirmation

Algorithm C: Chronic Progressive Headache

All Chronic Progressive Headaches Require Neuroimaging

This pattern is uncommon in primary headache and suggests an expanding intracranial process. MRI brain with contrast is preferred.

Imaging Result	Findings	Action
Mass lesion identified	Brain tumor, abscess, or other space-occupying lesion	Urgent neurosurgery referral; dexamethasone if significant edema; oncology involvement if tumor; manage elevated intracranial pressure
Hydrocephalus	Dilated ventricles; possible obstruction	Neurosurgery referral; identify cause; may require shunt or endoscopic third ventriculostomy
Chiari malformation	Tonsillar herniation more than 5 mm; possible syrinx	Neurosurgery referral; may require decompression if symptomatic
Signs of elevated pressure but no mass	Empty sella, flattened globes, optic nerve sheath distension	MRV to exclude venous thrombosis; lumbar puncture with opening pressure; likely pseudotumor cerebri
Venous sinus thrombosis	Absent flow in venous sinuses on MRV	Anticoagulation; thrombophilia workup; manage elevated pressure; hematology involvement
Normal MRI	No structural abnormality	Consider MRV if not done; lumbar puncture if elevated pressure suspected; re-evaluate clinical pattern; may be evolving chronic daily headache

Algorithm D: Chronic Non-Progressive (Daily) Headache

Step	Assessment	Action if Positive
1. Rule out secondary causes	Any red flags? Progressive features? Abnormal examination?	Neuroimaging; treat underlying cause
2. Assess for medication overuse	Analgesics more than 15 days/month? Triptans more than 10 days/month?	Medication withdrawal (may need bridge therapy); education; preventive medication
3. Screen for comorbidities	Anxiety? Depression? Sleep disorder? School avoidance?	Address psychological factors; consider psychology/psychiatry referral; treat sleep issues
4. Classify chronic daily headache	Does pattern meet criteria for chronic migraine, chronic tension-type, or new daily persistent headache?	Guide treatment selection based on diagnosis
5. Optimize lifestyle factors	Sleep hygiene? Hydration? Regular meals? Exercise? Screen time?	Structured lifestyle modification program; headache diary
6. Initiate preventive therapy	Adequate trial of evidence-based preventive?	Start preventive medication (amitriptyline, topiramate, propranolol); consider supplements (magnesium, riboflavin, CoQ10)
7. Consider multidisciplinary approach	Refractory to above measures?	Refer to pediatric headache specialist; consider biofeedback, cognitive behavioral therapy; infusion therapy for refractory cases

“What Do I Do If…” Decision Reference

Clinical Situation	Immediate Action	Next Step
Child under 5 years with new headache	Thorough evaluation; low threshold for imaging	MRI brain if any concerning features; close follow-up even if reassuring
Headache not responding to usual migraine treatment	Ensure adequate dose given early in attack; consider rescue therapy	If status migrainosus: IV hydration, antiemetics, ketorolac, consider admission for IV therapy
Patient taking analgesics daily for headache	Recognize medication overuse; educate patient and family	Plan withdrawal strategy; start preventive; address rebound headache with bridge therapy
Adolescent girl requesting oral contraceptives who has migraine	Determine if migraine with or without aura	Aura present: avoid estrogen-containing methods (progestin-only or non-hormonal); No aura: can use with monitoring
Child missing significant school due to headache	Validate symptoms; assess for school avoidance/anxiety	Multidisciplinary approach; school accommodations (504 plan); psychology involvement; optimize treatment; goal is return to function
Normal MRI in child with concerning headache pattern	Consider whether MRV was included; reassess clinical pattern	LP with opening pressure if elevated pressure suspected; close follow-up; repeat imaging if pattern changes
Parent very anxious despite reassuring evaluation	Acknowledge concerns; explain rationale for clinical diagnosis	Shared decision-making about imaging; if imaging done and normal, provide reassurance; consider anxiety impact on child’s headache
Headache after concussion persisting more than 1 month	Assess for post-concussion syndrome; rule out other pathology if atypical	Graded return to activities; treat headache type (often migraine-like); consider vestibular therapy; psychology if mood symptoms
Known migraine patient with new “different” headache	Take new headache seriously; do not assume it is just migraine	Full evaluation; consider imaging if significantly different from usual pattern
Child with VP shunt presenting with headache	Always consider shunt malfunction; low threshold for evaluation	CT head (compare to baseline); shunt series; neurosurgery consultation; may need shunt exploration

Troubleshooting Refractory Headache

When Treatment Isn’t Working — Ask These Questions

Is the diagnosis correct? Re-evaluate for secondary causes; consider atypical presentations; review headache diary
Was the preventive trial adequate? Most preventives require 2-3 months at therapeutic dose; many trials are too short or at subtherapeutic doses
Is there medication overuse? Present in up to 30% of adolescents with chronic daily headache; must be addressed before preventives will work
Are comorbidities being addressed? Anxiety, depression, and sleep disorders dramatically impact headache treatment response
Is there adherence to lifestyle modifications? Sleep, hydration, meals, exercise, and screen time all contribute
Are there ongoing triggers? School stress, family dynamics, bullying, undiagnosed learning differences
Is the family on board? Parental anxiety or secondary gain can perpetuate headache disability
Is a multidisciplinary approach needed? Refractory cases often benefit from neurology, psychology, physical therapy, and school coordination

When to Refer to Pediatric Neurology

Urgent Referral

Abnormal neuroimaging findings
Papilledema
Focal neurological deficits
Atypical aura (prolonged, motor, or brainstem features)
Suspected pseudotumor cerebri
Rapidly worsening headache pattern

Routine Referral

Diagnostic uncertainty
Failure of first-line preventive therapy
Chronic daily headache refractory to treatment
Need for specialized treatments (nerve blocks, infusions)
Significant disability despite treatment
Complex comorbidities

8. Clinical Pearls and Pitfalls

Practical wisdom — learn from successes and avoid common mistakes

Must-Know Clinical Pearls

Temporal pattern is king: The pattern of headache over time (acute, acute recurrent, chronic progressive, chronic non-progressive) is the single most important factor in determining urgency and guiding differential diagnosis. Always establish the temporal pattern first.

Migraine looks different in children: Pediatric migraine is often bilateral (unlike adult unilateral), shorter in duration (may be only 1-2 hours), and children appear pale and sick. Relief with sleep is highly characteristic. Ask about pallor — parents often notice this.

Family history is powerful: Up to 90% of children with migraine have a first-degree relative with migraine. A positive family history in the context of typical features is strongly supportive of the diagnosis and reduces the need for neuroimaging.

Normal examination is the norm: Most children with headache — even those with significant migraine — will have a completely normal neurological examination. This is expected and reassuring, not concerning.

Posterior fossa tumors present differently: In children, posterior fossa tumors are more common than in adults. They often present with subtle gait abnormality, clumsiness, or head tilt before headache becomes prominent. Always do a careful cerebellar examination.

Medication overuse is common in adolescents: Up to 30% of adolescents with chronic daily headache have medication overuse headache. If you don’t ask about analgesic frequency, you will miss this. Treatment requires withdrawal of the offending medication.

Sleep is therapeutic and diagnostic: Relief with sleep is characteristic of migraine and can be used both diagnostically and therapeutically. Many pediatric migraines are best treated by going to sleep in a dark, quiet room.

Lifestyle factors matter enormously: Sleep deprivation, skipped meals, dehydration, and excessive screen time are major contributors to pediatric headache. Addressing these factors may be more effective than medication in many cases.

Treat early for best results: Acute migraine treatment is most effective when given early, before central sensitization develops. Educate families about early treatment and ensure access to medication at school.

The headache diary is invaluable: A well-kept headache diary provides more diagnostic information than any test. It helps establish pattern, identify triggers, assess medication use, and monitor treatment response. Make this a standard part of evaluation.

Critical Pitfalls to Avoid

Assuming “chronic” means “benign”: Chronic progressive headache is a red flag, not a reassurance. Do not confuse “the headache has been going on for a long time” with “this is probably nothing serious.” Always clarify if the pattern is worsening.

Skipping fundoscopy: Papilledema is a critical finding that changes management entirely. Every child with significant headache should have a fundoscopic examination. If you cannot visualize the disc, refer to ophthalmology.

Missing medication overuse: Patients don’t volunteer this information because they see analgesics as treatment, not a problem. You must specifically ask “How many days per week do you take pain medicine?” If the answer is more than 2-3 days, consider medication overuse headache.

Diagnosing “sinus headache” in children: True sinus headache from sinusitis requires signs of infection (purulent discharge, fever, facial tenderness). Most “sinus headaches” are actually migraine — which commonly involves facial pain and congestion. Treating repeatedly for sinusitis misses the real diagnosis.

Inadequate preventive trials: Declaring a preventive medication “failed” after 2-3 weeks at a starting dose is premature. Most preventives need 2-3 months at a therapeutic dose to assess effectiveness. Titrate slowly and give adequate time.

Ignoring the psychiatric comorbidities: Anxiety and depression are extremely common in children with chronic headache and dramatically impact treatment response. If you’re not screening for these, you’re missing half the picture.

Dismissing a “different” headache in a known migraine patient: When a child with known migraine says “this headache is different,” take it seriously. Patients can develop new pathology. A change in headache pattern warrants fresh evaluation.

Forgetting about shunt malfunction: In any child with a ventricular shunt who presents with headache, shunt malfunction must be considered. Always compare new imaging to baseline, and have a low threshold for neurosurgery consultation.

Ordering CT when MRI is indicated: For non-emergency evaluation of pediatric headache, MRI is superior to CT (better soft tissue resolution, no radiation, better posterior fossa visualization). Avoid unnecessary radiation in children.

Delaying antibiotics in suspected meningitis: If bacterial meningitis is suspected, give empiric antibiotics immediately. Do not wait for CT, LP, or any other test. Minutes matter for outcomes.

Key Takeaways

Most pediatric headache is primary: Migraine and tension-type headache account for the vast majority of cases. A careful history and normal examination are usually sufficient for diagnosis without neuroimaging.
Temporal pattern guides everything: Establish whether the headache is acute, acute recurrent, chronic progressive, or chronic non-progressive — this determines urgency and differential diagnosis.
Red flags require action: Thunderclap onset, progressive worsening, nocturnal awakening, Valsalva triggers, focal deficits, papilledema, age under 5 years, and abnormal examination all warrant urgent evaluation.
MRI is preferred over CT: When neuroimaging is indicated in the non-emergency setting, MRI provides superior information without radiation exposure.
Medication overuse is underrecognized: Always ask about analgesic frequency in chronic daily headache. Treatment requires withdrawal of the overused medication.
Lifestyle factors are powerful: Sleep, hydration, regular meals, exercise, and screen time management are foundational treatments that should precede or accompany pharmacotherapy.
Comorbidities impact outcomes: Anxiety, depression, and sleep disorders are common in children with chronic headache and must be addressed for treatment to succeed.
Family history supports migraine: A positive family history of migraine in the context of typical clinical features is reassuring and supportive of the diagnosis.
Early treatment works best: Acute migraine treatment is most effective when given at the onset of symptoms, before pain escalates and central sensitization develops.
Multidisciplinary care for refractory cases: Children with chronic headache that is not responding to standard treatment benefit from a team approach including neurology, psychology, physical therapy, and school coordination.

Quick Reference Algorithm

Systematic Approach to Pediatric Headache:

Triage for emergencies: Thunderclap headache? Altered mental status? Focal deficits? Meningeal signs? Signs of herniation? → Emergency evaluation and management
Establish the temporal pattern: Acute single episode? Acute recurrent? Chronic progressive? Chronic non-progressive? → Guides differential and urgency
Identify red flags: Any present? → Neuroimaging indicated (urgent if progressive or focal findings)
Perform thorough examination: Fundoscopy, complete neurological examination, vital signs including blood pressure → Any abnormality requires investigation
Classify the headache type: Migraine (with or without aura)? Tension-type? Secondary headache? Other primary headache? → Guides treatment selection
Assess for complicating factors: Medication overuse? Psychiatric comorbidities? Sleep disorder? School avoidance? → Must be addressed for treatment success
Develop a treatment plan: Acute treatment optimization + Lifestyle modifications + Preventive therapy if indicated + Address comorbidities
Establish follow-up: Headache diary, return precautions, clear criteria for re-evaluation, and scheduled follow-up visit

Summary: The Five Questions to Answer

Question	Why It Matters	How to Answer
1. Is this urgent?	Determines immediate management	Screen for red flags; triage appropriately
2. What is the temporal pattern?	Guides differential diagnosis	Careful history of onset, evolution, and current pattern
3. Is this primary or secondary?	Determines need for investigation and treatment approach	History, examination, imaging if indicated
4. What factors are contributing?	Identifies modifiable targets for treatment	Assess lifestyle, medication use, comorbidities, triggers
5. What is the impact?	Determines treatment intensity and goals	School attendance, activities, family function, quality of life