Clinical Approach to Headache

Pediatric Comprehensive 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 headache in children

Headache is one of the most common symptoms encountered in pediatric practice, affecting approximately 60% of children and adolescents by age 15 years. It accounts for approximately 1-2% of all pediatric emergency department visits and is among the top ten reasons for outpatient pediatric consultations. The prevalence increases with age, rising from approximately 3-8% in preschool children to 57-82% in adolescents. While the vast majority of pediatric headaches are benign primary headache disorders, the clinician must remain vigilant for secondary causes that may indicate serious underlying pathology.

Definition

Headache is defined as pain or discomfort located in any region of the head, including the scalp, face, and interior of the head. In children, headache is classified as either primary (the headache itself is the disorder, such as migraine or tension-type headache) or secondary (headache is a symptom of an underlying condition, such as infection, trauma, or intracranial pathology).

Key Epidemiology

Prevalence by age: 3-8% in preschoolers, 20% by age 5, 37-51% by age 7, 57-82% in adolescents
Gender distribution: Equal before puberty; female predominance (3:1) after puberty for migraine
Migraine prevalence: 3-10% of children; peaks around puberty
Tension-type headache: Most common primary headache type (10-25% of children)
Secondary causes requiring urgent evaluation: Less than 3% of pediatric headaches
Brain tumors: Present with headache in 62% of cases, but headache is rarely the only symptom

Classification by Temporal Pattern

The temporal pattern of headache is the most clinically useful classification in pediatrics, as it guides the differential diagnosis and urgency of evaluation.

Pattern	Definition	Common Causes	Clinical Significance
Acute	Single episode or first severe headache without prior history	Viral illness, sinusitis, streptococcal pharyngitis, first migraine, meningitis, intracranial hemorrhage	Requires careful evaluation to exclude serious secondary causes; “first or worst” headache warrants urgent assessment
Acute Recurrent	Episodic headaches separated by symptom-free intervals	Migraine (most common), tension-type headache, cluster headache (rare in children)	Classic pattern for primary headache disorders; between episodes, child is completely well
Chronic Progressive	Headaches increasing in frequency and/or severity over weeks to months	Brain tumor, hydrocephalus, idiopathic intracranial hypertension, subdural hematoma, brain abscess	RED FLAG pattern: Requires urgent neuroimaging to exclude space-occupying lesion or increased intracranial pressure
Chronic Non-Progressive	Daily or near-daily headaches of stable intensity for more than 3 months	Chronic migraine, chronic tension-type headache, new daily persistent headache, medication overuse headache	Often associated with psychosocial stressors, anxiety, depression, or school avoidance; medication overuse must be excluded
Mixed Pattern	Combination of chronic background headache with superimposed acute severe episodes	Chronic migraine with episodic exacerbations, chronic tension-type headache with superimposed migraine	Common in adolescents; requires addressing both the chronic component and acute episodes

Critical Concept: The chronic progressive pattern is the most concerning temporal pattern in pediatric headache. A headache that is progressively worsening over time, particularly when associated with neurological signs, warrants urgent neuroimaging regardless of other features.

Classification by Headache Type (ICHD-3 Criteria)

The International Classification of Headache Disorders, 3rd edition (ICHD-3), provides standardized diagnostic criteria. The two most common primary headache disorders in children are migraine and tension-type headache.

Migraine

Prevalence: 3-10% of children; increases with age

Duration: 2-72 hours in children (shorter than adults)

Key Features:

Pulsating quality (may be bilateral in young children)
Moderate to severe intensity
Aggravated by physical activity
Nausea and/or vomiting
Photophobia and phonophobia
Desire to lie down in dark, quiet room

Pediatric Considerations: In young children, migraine is often bilateral (frontal or bitemporal) rather than unilateral; photophobia/phonophobia may be inferred from behavior

Tension-Type Headache

Prevalence: 10-25% of children; most common primary headache

Duration: 30 minutes to 7 days

Key Features:

Pressing or tightening (non-pulsating) quality
Bilateral location (“band-like”)
Mild to moderate intensity
Not aggravated by routine physical activity
No nausea or vomiting
May have photophobia OR phonophobia (not both)

Pediatric Considerations: Often associated with stress, anxiety, sleep deprivation, or school-related issues; may be difficult to distinguish from mild migraine

Age-Specific Considerations

Age Group	Common Causes	Clinical Considerations
Infants and Toddlers (0-3 years)	Viral illness, otitis media, meningitis, hydrocephalus, nonaccidental trauma	Cannot verbalize headache; present with irritability, head holding, vomiting, or lethargy; high index of suspicion for secondary causes required
Preschool (3-5 years)	Viral illness, sinusitis, migraine (can begin at this age), refractive errors	Beginning to localize and describe pain; migraine often presents as episodic vomiting or abdominal pain (abdominal migraine)
School Age (6-11 years)	Migraine, tension-type headache, viral illness, sinusitis, refractive errors, dental problems	Classic migraine features become more apparent; school-related stress emerges as trigger; screen for vision problems
Adolescents (12-18 years)	Migraine, tension-type headache, chronic daily headache, medication overuse headache, idiopathic intracranial hypertension	Adult-like presentations; screen for depression, anxiety, substance use; medication overuse common; female predominance for migraine emerges

Classification by Location

Location	Common Causes	Clinical Clues
Frontal/Bifrontal	Tension-type headache, migraine (young children), sinusitis, refractive error	Most common location in children regardless of headache type
Temporal (Unilateral)	Migraine, temporomandibular joint dysfunction	Classic migraine location in older children and adolescents
Occipital	Tension-type headache, posterior fossa lesion, Chiari malformation, cervicogenic headache	Isolated occipital headache in young children warrants neuroimaging
Periorbital	Migraine, sinusitis, orbital cellulitis, refractive error	Eye examination and vision screening important
Generalized	Increased intracranial pressure, meningitis, viral illness, chronic daily headache	Consider intracranial pathology if associated with vomiting or neurological signs

Impact on Quality of Life

Pediatric headache disorders significantly impact quality of life, affecting school attendance, academic performance, social interactions, and family dynamics. Children with chronic migraine miss an average of 7.8 school days per year due to headache. The psychosocial impact includes:

Academic: Difficulty concentrating, missed school days, declining grades
Social: Reduced participation in extracurricular activities and sports
Psychological: Increased rates of anxiety, depression, and sleep disturbance
Family: Disruption of family activities, parental work absences, stress on siblings

The Pediatric Headache Triad to Remember:

Pattern Recognition: The temporal pattern (acute, acute recurrent, chronic progressive, chronic non-progressive) is the most important initial classification
Primary versus Secondary: Most pediatric headaches are primary (benign), but secondary causes must be excluded, especially with red flags
Age Matters: Headache presentation and causes vary significantly by age; younger children require higher suspicion for secondary causes

2. Pathophysiology and Mechanisms

Understanding the underlying mechanisms of headache in children

Understanding headache pathophysiology is essential for appropriate diagnosis and treatment. The brain parenchyma itself is insensitive to pain; headache arises from activation of pain-sensitive structures including the meninges, blood vessels, and cranial nerves. In children, the developing nervous system may exhibit different pain processing and thresholds compared to adults, contributing to age-specific presentations.

Pain-Sensitive Structures

Headache results from stimulation, traction, displacement, inflammation, or distension of pain-sensitive intracranial and extracranial structures:

Structure	Location	Pain Innervation	Clinical Relevance
Dura mater	Intracranial	Trigeminal nerve (V1, V2, V3) and upper cervical nerves (C1-C3)	Traction or inflammation causes referred pain to face, head, and neck
Cerebral blood vessels	Intracranial	Trigeminal nerve and sympathetic fibers	Distension or inflammation triggers vascular headaches; key in migraine pathophysiology
Venous sinuses	Intracranial	Trigeminal nerve	Thrombosis or increased pressure causes headache
Scalp and pericranial muscles	Extracranial	Trigeminal and cervical nerves	Muscle tension and tenderness in tension-type headache
Paranasal sinuses	Extracranial	Trigeminal nerve branches	Inflammation causes referred facial and headache pain
Eyes and orbits	Extracranial	Ophthalmic division of trigeminal nerve (V1)	Refractive errors, glaucoma, and orbital pathology cause periorbital and frontal pain

Key Anatomical Principle

The brain parenchyma itself has no pain receptors. Therefore, even large brain lesions may not cause headache until they affect pain-sensitive structures (meninges, blood vessels) or cause increased intracranial pressure. This explains why some children with brain tumors present late with significant intracranial pathology.

Migraine Pathophysiology

Migraine is now understood as a neurovascular disorder involving cortical, subcortical, and brainstem dysfunction rather than a purely vascular phenomenon. The pathophysiology involves multiple interconnected mechanisms:

Cortical Spreading Depression

Mechanism: A wave of neuronal and glial depolarization that spreads across the cortex at 3-5 mm/minute

Consequence: Causes the visual and sensory symptoms of migraine aura; triggers trigeminal activation

Pediatric Note: Aura is less common in children than adults; may present as confusion or behavioral change

Trigeminovascular Activation

Mechanism: Activation of trigeminal nerve fibers surrounding cerebral blood vessels releases vasoactive neuropeptides (calcitonin gene-related peptide, substance P)

Consequence: Neurogenic inflammation, vasodilation, and pain signal transmission to brainstem

Pediatric Note: Higher CGRP levels found during pediatric migraine attacks

Brainstem and Thalamic Processing

Mechanism: Central sensitization in trigeminal nucleus caudalis and thalamus amplifies and prolongs pain perception

Consequence: Allodynia (pain from non-painful stimuli), photophobia, phonophobia

Pediatric Note: Developing pain pathways may process migraine differently; explains some atypical presentations

Phase	Duration	Pathophysiology	Clinical Features
Prodrome	Hours to days before headache	Hypothalamic and limbic system activation	Mood changes, food cravings, yawning, fatigue, neck stiffness
Aura	5-60 minutes	Cortical spreading depression	Visual disturbances (most common), sensory symptoms, speech difficulties; present in only 15-30% of pediatric migraine
Headache	2-72 hours in children	Trigeminovascular activation, neurogenic inflammation, central sensitization	Throbbing pain, nausea, vomiting, photophobia, phonophobia; often bilateral in young children
Postdrome	Hours to days	Resolution of cortical and vascular changes	Fatigue, difficulty concentrating, mood changes, food cravings or anorexia

Tension-Type Headache Pathophysiology

The pathophysiology of tension-type headache involves both peripheral and central mechanisms, with the relative contribution varying between episodic and chronic forms:

Peripheral Mechanisms

Pericranial muscle tenderness: Increased tenderness and EMG activity in neck and scalp muscles
Myofascial trigger points: Localized areas of muscle hyperirritability
Peripheral sensitization: Lowered pain threshold in muscle nociceptors

Predominates in: Episodic tension-type headache

Central Mechanisms

Central sensitization: Increased excitability of central pain pathways
Impaired descending pain modulation: Reduced supraspinal inhibition of pain
Psychological factors: Stress, anxiety, and depression modulate pain processing

Predominates in: Chronic tension-type headache

Secondary Headache Mechanisms

Mechanism	Conditions	Pathophysiology	Clinical Implications
Increased Intracranial Pressure	Brain tumor, hydrocephalus, idiopathic intracranial hypertension, venous sinus thrombosis	Stretching and displacement of pain-sensitive dura and blood vessels; compression of cranial nerves	Headache worse in morning, with Valsalva maneuvers, when lying down; papilledema; sixth nerve palsy
Meningeal Irritation	Meningitis (bacterial, viral, fungal), subarachnoid hemorrhage, post-lumbar puncture	Inflammation or blood products irritating the meninges; activation of meningeal nociceptors	Severe headache, neck stiffness, photophobia; Kernig and Brudzinski signs; fever in infectious causes
Vascular Distension/Inflammation	Arteriovenous malformation, aneurysm, vasculitis, stroke	Stretching of vessel walls; inflammation of vascular adventitia; hemorrhage	Sudden onset severe headache (“thunderclap”); focal neurological deficits; may have bruit
Low Intracranial Pressure	Post-lumbar puncture headache, spontaneous intracranial hypotension, cerebrospinal fluid leak	Downward displacement of brain causing traction on pain-sensitive structures; meningeal enhancement	Headache dramatically worse when upright, improves when lying flat (orthostatic pattern)
Referred Pain	Sinusitis, otitis media, dental pathology, temporomandibular joint dysfunction, cervical spine pathology	Convergence of nociceptive afferents from extracranial structures onto trigeminal nucleus caudalis	Pain localized to specific region; tenderness over affected structure; symptoms worsen with specific triggers

Pediatric-Specific Pathophysiological Considerations

The Developing Brain and Pain Processing

Several features of the developing nervous system influence headache presentation in children:

Myelination: Incomplete myelination in young children may alter pain signal transmission and processing
Neuroplasticity: Greater neuroplasticity may contribute to both different presentations and better treatment response
Neurotransmitter systems: Developing serotonergic and dopaminergic systems may explain age-related differences in migraine features
Hormonal influences: Puberty-related hormonal changes explain the shift to female predominance in migraine after adolescence
Sleep architecture: Age-related changes in sleep patterns influence headache frequency and timing

Genetic and Environmental Factors

Genetic Factors

Family history: 50-90% of children with migraine have a first-degree relative with migraine
Heritability: Twin studies show 40-50% heritability for migraine
Candidate genes: CACNA1A, ATP1A2, SCN1A (familial hemiplegic migraine); MTHFR variants
Polygenic inheritance: Most pediatric migraine follows complex polygenic inheritance pattern

Environmental Triggers

Sleep: Both deprivation and excess sleep trigger headaches
Stress: Academic pressure, family stress, peer relationships
Diet: Skipped meals more important than specific food triggers in children
Dehydration: Common and modifiable trigger
Screen time: Prolonged use associated with headache
Physical activity: Both lack of activity and overexertion

Mechanism Summary: How Conditions Cause Headache

Condition	Primary Mechanism	Treatment Implication
Migraine	Trigeminovascular activation, cortical spreading depression, central sensitization	Triptans block trigeminal activation; preventives reduce cortical excitability
Tension-type headache	Peripheral myofascial mechanisms plus central sensitization in chronic form	Simple analgesics for episodic; stress management and preventives for chronic
Brain tumor	Mass effect causing traction on pain-sensitive structures; increased intracranial pressure	Surgical resection; corticosteroids reduce peritumoral edema
Meningitis	Meningeal inflammation activating meningeal nociceptors	Treat underlying infection; anti-inflammatory agents
Idiopathic intracranial hypertension	Elevated cerebrospinal fluid pressure causing dural and vascular stretch	Weight loss; acetazolamide reduces cerebrospinal fluid production; shunting if refractory
Sinusitis	Inflammation of sinus mucosa; referred pain via trigeminal nerve branches	Treat infection; decongestants; drainage if complicated
Post-traumatic headache	Diffuse axonal injury, neuroinflammation, central sensitization	Cognitive and physical rest initially; treat based on headache phenotype
Medication overuse headache	Central sensitization from chronic analgesic exposure; altered pain modulation	Withdrawal of offending medication; bridge therapy; preventive treatment

Clinical Pearl: The Threshold Theory

Migraine can be understood as a lowered threshold for activation of the trigeminovascular system. In children with migraine, this threshold is determined by genetic susceptibility and modulated by environmental factors (triggers). This explains why identifying and managing triggers (sleep, stress, meals, hydration) is a cornerstone of pediatric migraine management—raising the threshold reduces attack frequency even without preventive medication.

3. History Taking

A comprehensive approach to eliciting the headache history in children

Red Flags — Require Urgent Evaluation

First or worst headache — Intracranial hemorrhage, meningitis, mass lesion
Thunderclap onset (maximal intensity within seconds) — Subarachnoid hemorrhage, arterial dissection
Progressive worsening pattern — Brain tumor, hydrocephalus, chronic subdural hematoma
Headache awakening child from sleep — Increased intracranial pressure
Early morning headache with vomiting — Posterior fossa tumor, hydrocephalus
Headache worse with coughing, straining, or Valsalva — Chiari malformation, mass lesion

Associated focal neurological symptoms — Space-occupying lesion, stroke, demyelination
Altered mental status or personality change — Encephalitis, mass lesion, metabolic cause
Papilledema or visual changes — Increased intracranial pressure, idiopathic intracranial hypertension
New headache in immunocompromised child — Opportunistic infection, malignancy
Headache following head trauma — Intracranial hemorrhage, post-concussion syndrome
Occipital headache in young child — Posterior fossa pathology
Age less than 5 years with new headache — Higher risk of secondary cause

Taking a thorough headache history in children requires patience and skill. Young children may have difficulty describing their symptoms, necessitating careful questioning and observation. Always obtain history from both the child (when age-appropriate) and the caregiver, as perspectives may differ. The history should focus on identifying the temporal pattern, characterizing the headache features, and screening for red flags that suggest secondary causes.

Systematic History: The “HEADACHE” Approach

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

H — How did it start and How long? Onset (sudden vs gradual), duration of each episode, and temporal pattern (acute, acute recurrent, chronic progressive, chronic non-progressive)
E — Episodes and Evolution: Frequency of attacks, symptom-free intervals, any change in pattern over time (getting worse, better, or staying the same)
A — Associated symptoms: Nausea, vomiting, photophobia, phonophobia, visual changes, dizziness, numbness, weakness, fever, neck stiffness
D — Description and Distribution: Quality (throbbing, pressing, stabbing), location (unilateral, bilateral, frontal, occipital), severity (mild, moderate, severe; use age-appropriate pain scales)
A — Aggravating and Alleviating factors: What makes it worse (activity, light, noise, coughing, bending)? What helps (rest, sleep, dark room, medications)?
C — Clues from Context: Recent illness, trauma, stress, sleep changes, dietary changes, new medications, menstrual cycle (adolescent females)
H — History (medical, family, developmental): Past medical history, family history of headache/migraine, birth history, developmental milestones, current medications
E — Effect on life: Impact on school attendance, academic performance, social activities, sleep, mood, and family dynamics

Characterizing the Temporal Pattern

The temporal pattern is the single most important historical feature for guiding the differential diagnosis and determining urgency:

Pattern	Key Questions to Ask	What You’re Looking For
Acute (First/Single Episode)	“Is this the first headache like this?” “How quickly did it reach maximum intensity?” “Any recent illness, injury, or fever?”	Sudden onset suggests vascular cause; associated fever suggests infection; trauma history suggests intracranial hemorrhage
Acute Recurrent	“How often do the headaches occur?” “Is your child completely well between episodes?” “How long do they last?”	Symptom-free intervals support primary headache; typical duration 2-72 hours for migraine, 30 min-7 days for tension-type
Chronic Progressive	“Are the headaches getting worse over time?” “More frequent, more severe, or both?” “Any new symptoms developing?”	RED FLAG pattern — worsening over weeks to months suggests space-occupying lesion; requires urgent neuroimaging
Chronic Non-Progressive	“How many days per month does your child have headache?” “Has the severity stayed about the same?” “When did this daily pattern begin?”	Daily or near-daily headaches of stable intensity; inquire about medication overuse, stress, anxiety, depression

Targeted Questions by Suspected Cause

Suspected Cause	Key Features	Ask This Question
Migraine	Episodic, moderate-severe, pulsating, with nausea/vomiting, photophobia/phonophobia	“Does your child want to lie down in a dark, quiet room?” “Does the headache get worse with running or climbing stairs?” “Does anyone in the family have migraines?”
Tension-type headache	Bilateral, pressing/tightening, mild-moderate, no nausea	“Does it feel like a band or pressure around the head?” “Can your child continue activities during the headache?” “Is there a lot of stress at school or home?”
Increased intracranial pressure	Progressive, worse in morning, with vomiting, visual changes	“Is the headache worse when your child first wakes up?” “Does coughing, sneezing, or bearing down make it worse?” “Any changes in vision or balance?”
Meningitis/Encephalitis	Acute, severe, with fever, neck stiffness, altered mental status	“Has there been any fever?” “Does it hurt to bend the neck forward?” “Has your child seemed confused or unusually sleepy?”
Sinusitis	Frontal/facial pain, nasal congestion, post-nasal drip, worsened by bending forward	“Is there nasal congestion or colored nasal discharge?” “Is the pain over the forehead or cheeks?” “Does bending forward make it worse?”
Medication overuse headache	Daily headache in patient taking analgesics ≥10-15 days/month	“How often does your child take pain medication for headaches?” “What medications and how many days per month?” “Does the headache come back when the medication wears off?”
Idiopathic intracranial hypertension	Daily headache, visual obscurations, pulsatile tinnitus, in overweight adolescent female	“Any brief episodes of vision going gray or black?” “Any ringing or whooshing sound in the ears?” “Has there been recent weight gain?”
Post-traumatic headache	Headache beginning within 7 days of head injury	“Was there any head injury, even minor, before the headaches started?” “Any loss of consciousness, confusion, or amnesia with the injury?”
Refractive error	Frontal headache, worse with reading/screens, relieved by rest	“Is the headache worse after reading or using screens?” “Has your child had a recent eye examination?” “Does your child squint or hold things close to see?”

Pediatric-Specific History Components

Birth and Early History

Gestational age and birth weight: Prematurity associated with intraventricular hemorrhage, hydrocephalus
Perinatal complications: Hypoxic-ischemic injury, neonatal infections
Congenital anomalies: Chiari malformation, vascular malformations
Previous neurosurgery: Shunt placement, tumor resection

Developmental History

Developmental milestones: Motor, language, social development on track?
Academic performance: Any recent decline or learning difficulties?
Behavioral changes: New irritability, personality change, regression?
Previous developmental assessments: Any diagnosed conditions?

School and Social History

School attendance: Days missed due to headache
Academic pressure: Exams, homework load, expectations
Peer relationships: Bullying, social stress, isolation
Extracurricular activities: Sports, activities, screen time
Family dynamics: Parental conflict, recent changes, sibling issues

Lifestyle Factors

Sleep: Bedtime, wake time, sleep quality, sleep disorders
Hydration: Daily fluid intake, caffeinated beverages
Meals: Regular meals or skipping breakfast/lunch
Caffeine: Intake and any recent changes
Screen time: Duration and timing (especially before bed)
Physical activity: Regular exercise or sedentary lifestyle

Family History

The Importance of Family History in Pediatric Headache

Family history is particularly valuable in pediatric headache evaluation:

Migraine: 50-90% of children with migraine have a first-degree relative with migraine; often underdiagnosed in parents as “sinus headaches”
Tension-type headache: Also shows familial clustering, though less strongly than migraine
Vascular malformations: Some have hereditary patterns (hereditary hemorrhagic telangiectasia)
Genetic syndromes: Neurofibromatosis, tuberous sclerosis associated with brain tumors
Metabolic conditions: Mitochondrial disorders may present with migraine-like headaches

Ask specifically: “Does anyone in the family—parents, siblings, grandparents—have headaches or migraines?” Many parents don’t recognize their own migraines.

Medication and Substance History

Medications That Can Cause Headache

Stimulants (methylphenidate, amphetamines) — Common cause in children with ADHD
Oral contraceptives — In adolescent females
Isotretinoin — Associated with idiopathic intracranial hypertension
Corticosteroids — Both during use and withdrawal
Tetracyclines (doxycycline, minocycline) — Idiopathic intracranial hypertension
Growth hormone — Idiopathic intracranial hypertension
Vitamin A excess — Idiopathic intracranial hypertension
Withdrawal from — Caffeine, opioids, barbiturates

Medication Overuse Assessment

Critical to assess in chronic daily headache:

Simple analgesics (paracetamol, ibuprofen): Overuse if ≥15 days/month
Triptans: Overuse if ≥10 days/month
Combination analgesics: Overuse if ≥10 days/month
Opioids: Overuse if ≥10 days/month

Key questions:

“What medications does your child take for headaches?”
“How many days per month does your child take pain medication?”
“Does your child take medication to prevent a headache from getting worse?”

Assessing Functional Impact

Domain	Questions to Ask	Clinical Significance
School	“How many school days has your child missed due to headache in the last month/semester?” “Can your child concentrate in class during a headache?”	Significant disability indicates need for preventive treatment; school avoidance may suggest anxiety component
Sleep	“Does the headache affect your child’s sleep?” “Does the headache wake your child from sleep?”	Sleep disruption perpetuates headache cycle; headache waking from sleep is a red flag
Activities	“Has your child had to stop activities they enjoy because of headaches?” “Can your child participate in sports and play?”	Activity limitation indicates significant disability; balance rest with maintaining normal activities
Mood	“How does your child’s mood change during headaches?” “Has your child seemed sad, worried, or anxious?”	Screen for comorbid anxiety and depression; bidirectional relationship with chronic headache
Family	“How do the headaches affect the family?” “Has a parent had to miss work?”	Assess family burden and coping; family involvement important for treatment success

Clinical Pearl: The Headache Diary

A headache diary is invaluable for diagnosis and management. Recommend that families track:

Date, time of onset, and duration of each headache
Pain severity (use age-appropriate scale: faces scale for young children, 0-10 for older children)
Location and quality of pain
Associated symptoms (nausea, vomiting, light/sound sensitivity)
Potential triggers (sleep, food, stress, activity, weather, menses)
Medications taken and response
School days missed and activities affected

Review the diary at follow-up to identify patterns, triggers, and treatment response. Many smartphone apps are available for headache tracking.

4. Physical Examination

A systematic head-to-toe approach for evaluating headache in children

Systematic Framework: Use a structured “General → Head and Neck → Neurological → Systems” approach for complete examination of children presenting with headache. The examination should be tailored to the child’s age, level of cooperation, and the clinical context (acute versus chronic headache).

Examination Goals

The physical examination in pediatric headache serves to:

Exclude secondary causes — Identify signs of increased intracranial pressure, infection, or structural pathology
Support the diagnosis — Confirm findings consistent with primary headache disorders
Assess severity — Evaluate for signs of acute distress or chronic disease
Guide further investigation — Determine need for neuroimaging or other testing
Reassure family — A thorough normal examination helps reassure families and reduces anxiety

General Inspection

Appearance: Well or unwell? Toxic-appearing? Level of alertness and interaction
Position of comfort: Lying still in dark room (migraine) versus writhing in pain (cluster headache, rare in children)
Facial expression: Grimacing, photophobia (closing eyes, turning from light)
Skin: Pallor, flushing, rash (meningococcemia), neurocutaneous stigmata
Growth: Measure and plot height, weight, and head circumference (children <3 years); calculate BMI in older children
Dysmorphic features: May indicate genetic syndrome associated with structural brain abnormalities
Behavior: Age-appropriate behavior? Irritability? Lethargy?

Vital Signs

Age	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 (axillary) Fever (≥38°C) with headache requires evaluation for infection
Toddler (1-3 years)	90-150	24-40	80-100
Preschool (3-5 years)	80-140	22-34	80-110
School age (6-11 years)	70-120	18-30	85-120
Adolescent (12-18 years)	60-100	12-20	90-120

Vital Sign Abnormality	Clinical Significance in Headache
Fever	Suggests infectious etiology — meningitis, encephalitis, sinusitis, systemic infection
Hypertension	Can cause headache directly; also seen with increased intracranial pressure (Cushing response); screen for secondary hypertension
Bradycardia with hypertension	Cushing triad (with irregular respirations) — indicates severely elevated intracranial pressure; neurosurgical emergency
Tachycardia	Pain response, fever, dehydration, anxiety, anemia
Abnormal respiratory pattern	Cheyne-Stokes, ataxic breathing — brainstem dysfunction

Head and Neck Examination

Head

Head circumference: Measure in children <3 years; macrocephaly may indicate hydrocephalus; microcephaly may indicate congenital infection or syndrome
Fontanelle: In infants — bulging suggests increased intracranial pressure; sunken suggests dehydration
Cranial sutures: Widened sutures in infants suggest increased intracranial pressure
Scalp: Tenderness, swelling, signs of trauma, ventricular shunt tubing
Palpation: Temporal artery tenderness (rare in children), sinus tenderness over frontal and maxillary areas
Auscultation: Cranial bruit (may indicate arteriovenous malformation, though rarely audible)

Eyes

Examination	What to Look For	Clinical Significance
Pupil examination	Size, symmetry, reactivity	Unilateral dilation with decreased reactivity — third nerve palsy (uncal herniation); Horner syndrome (ptosis, miosis, anhidrosis)
Visual acuity	Age-appropriate testing	Decreased acuity may indicate optic nerve involvement; refractive error as headache cause
Visual fields	Confrontation testing (older children)	Field defects suggest intracranial mass or idiopathic intracranial hypertension
Fundoscopy	Optic disc margins, venous pulsations	Papilledema — blurred disc margins, elevated disc, absent venous pulsations — indicates increased intracranial pressure; requires urgent evaluation
Eye movements	Full range in all directions	Sixth nerve palsy (failure of lateral gaze) — false localizing sign of increased intracranial pressure; third nerve palsy (down and out, dilated pupil)

Critical: Fundoscopy in Pediatric Headache

Fundoscopic examination to assess for papilledema is mandatory in any child with:

New or worsening headache pattern
Chronic daily headache
Headache with vomiting (especially morning vomiting)
Headache with any neurological symptoms
Headache in young children (age <5 years)

Note: Fundoscopy can be challenging in uncooperative children. If adequate visualization is not possible and clinical concern exists, ophthalmology consultation or neuroimaging should not be delayed.

Ears, Nose, and Throat

Ears: Otitis media can cause referred headache; mastoid tenderness (mastoiditis)
Nose: Nasal congestion, purulent discharge, septal deviation (sinusitis)
Sinuses: Tenderness over frontal and maxillary sinuses (sinusitis); transillumination rarely helpful in children
Throat: Pharyngeal erythema, tonsillar enlargement (streptococcal pharyngitis can cause headache)
Teeth: Dental caries, malocclusion (dental pathology, temporomandibular joint dysfunction)
Temporomandibular joint: Tenderness, crepitus, limited opening (temporomandibular joint dysfunction)

Neck

Meningeal signs:
- Neck stiffness: Resistance to passive flexion (meningitis, subarachnoid hemorrhage)
- Kernig sign: Resistance/pain with knee extension when hip is flexed to 90°
- Brudzinski sign: Involuntary hip and knee flexion when neck is passively flexed
Range of motion: Pain or limitation may indicate cervicogenic headache or meningitis
Lymphadenopathy: May indicate infection
Thyroid: Enlargement (rare cause of headache through metabolic effects)

Clinical Pearl: Meningeal Signs in Children

Meningeal signs may be unreliable or absent in:

Infants: May have nonspecific signs (irritability, poor feeding, bulging fontanelle) rather than classic neck stiffness
Very early meningitis: Signs may not yet have developed
Immunocompromised children: May have blunted inflammatory response
Partially treated meningitis: Prior antibiotics may mask signs

A high index of suspicion and low threshold for lumbar puncture is warranted when meningitis is considered, regardless of meningeal sign findings.

Neurological Examination

A thorough neurological examination is essential in every child with headache. The examination should be age-appropriate, using developmental assessments in young children.

Mental Status

Level of consciousness: Alert, drowsy, lethargic, obtunded, comatose (use pediatric Glasgow Coma Scale if impaired)
Orientation: Person, place, time (age-appropriate)
Behavior: Appropriate for age? Irritability, apathy, personality change?
Speech: Fluency, comprehension, naming (age-appropriate)
Attention and concentration: Can follow commands? Easily distracted?

Cranial Nerves

Cranial Nerve	Test	Abnormality and Significance
I (Olfactory)	Smell identification (older children)	Anosmia — frontal lobe tumor, post-traumatic
II (Optic)	Visual acuity, visual fields, fundoscopy	Decreased acuity, field cuts, papilledema — see eye examination above
III, IV, VI (Oculomotor, Trochlear, Abducens)	Eye movements, pupils	Diplopia, strabismus, ptosis, abnormal pupils — mass lesion, increased intracranial pressure, aneurysm
V (Trigeminal)	Facial sensation, masseter strength, corneal reflex	Sensory loss, weakness — brainstem or cavernous sinus lesion
VII (Facial)	Facial symmetry, strength	Facial weakness — Bell palsy, brainstem lesion, middle ear pathology
VIII (Vestibulocochlear)	Hearing, nystagmus	Hearing loss, vertigo, nystagmus — cerebellopontine angle tumor, vestibular pathology
IX, X (Glossopharyngeal, Vagus)	Palate movement, gag reflex, voice	Dysarthria, dysphagia — brainstem lesion
XI (Accessory)	Shoulder shrug, head turn	Weakness — rarely affected in isolation
XII (Hypoglossal)	Tongue protrusion, movement	Tongue deviation, atrophy — brainstem or skull base lesion

Motor Examination

Tone: Hypotonia (cerebellar, neuromuscular), hypertonia/spasticity (upper motor neuron lesion)
Strength: Test major muscle groups; look for asymmetry, pronator drift
Bulk: Atrophy suggests chronic denervation
Abnormal movements: Tremor, chorea, dystonia

Sensory Examination

Light touch and pain: Test major dermatomes if cooperative
Proprioception: Joint position sense (if cooperative)
Age-appropriate assessment: In young children, observe response to touch and withdrawal from painful stimuli

Cerebellar Examination

Gait: Observe walking, tandem gait (heel-to-toe), running — ataxia suggests cerebellar lesion
Coordination: Finger-to-nose, heel-to-shin (older children); observe reaching for toys (young children)
Rapid alternating movements: Dysdiadochokinesia in cerebellar dysfunction
Romberg test: Positive (falls with eyes closed) suggests proprioceptive or vestibular dysfunction

Reflexes

Deep tendon reflexes: Biceps, triceps, brachioradialis, knee, ankle — asymmetry or hyperreflexia concerning
Plantar response: Extensor (Babinski) response abnormal after age 12-18 months — upper motor neuron lesion
Clonus: Sustained clonus suggests upper motor neuron pathology

Skin Examination

Neurocutaneous stigmata may indicate syndromes associated with intracranial pathology:

Finding	Associated Syndrome	Intracranial Associations
Café-au-lait spots (≥6)	Neurofibromatosis type 1	Optic glioma, other gliomas, moyamoya syndrome
Ash-leaf spots, shagreen patch, facial angiofibromas	Tuberous sclerosis	Subependymal nodules, cortical tubers, giant cell astrocytoma
Port-wine stain (V1 distribution)	Sturge-Weber syndrome	Leptomeningeal angioma, seizures, stroke-like episodes
Telangiectasias (lips, tongue, fingers)	Hereditary hemorrhagic telangiectasia	Arteriovenous malformations, pulmonary AVMs with paradoxical emboli
Petechiae, purpura	Meningococcemia, other sepsis	Meningitis, septic emboli

Summary: Expected Findings by Etiology

Condition	General/Vital Signs	Neurological Examination	Other Findings
Migraine	May appear pale, quiet, photophobic; vital signs usually normal	Usually normal; may have mild sensory changes during aura	Prefers dark, quiet environment; may have scalp allodynia
Tension-type headache	Appears well; vital signs normal	Normal	May have pericranial muscle tenderness
Brain tumor/Increased intracranial pressure	Variable; may have hypertension, bradycardia (Cushing response)	Papilledema; sixth nerve palsy; focal deficits depend on location; gait ataxia (posterior fossa)	Macrocephaly in infants; bulging fontanelle; vomiting
Meningitis	Fever, tachycardia, may appear toxic	Meningeal signs (neck stiffness, Kernig, Brudzinski); altered mental status	Petechial rash (meningococcal); photophobia
Idiopathic intracranial hypertension	Often overweight; vital signs usually normal	Papilledema; sixth nerve palsy; visual field defects	Pulsatile tinnitus
Sinusitis	May have low-grade fever; nasal congestion	Normal	Sinus tenderness; purulent nasal discharge; periorbital swelling if complicated
Post-traumatic headache	Variable; usually stable vitals	Usually normal; may have subtle cognitive changes or vestibular dysfunction	May have scalp tenderness or visible trauma

Important Teaching Point

Normal examination is common! The majority of children with headache, including those with migraine and tension-type headache, will have an entirely normal physical and neurological examination. A normal examination between headache episodes is actually reassuring and supports the diagnosis of a primary headache disorder.

However, a normal examination does not exclude serious pathology if the history is concerning (chronic progressive pattern, red flags). In such cases, neuroimaging is indicated regardless of examination findings.

When to Examine During Versus Between Attacks

Examination During Headache Attack

Assess severity and level of distress
Look for autonomic features (tearing, nasal congestion, ptosis) — suggest trigeminal autonomic cephalalgia
Check for cutaneous allodynia (light touch perceived as painful)
Neurological examination to exclude focal deficits
Fundoscopy if increased intracranial pressure suspected

Examination Between Attacks

Complete neurological examination without time pressure
Growth parameters assessment
Thorough fundoscopy
Assessment of baseline developmental status
Screen for anxiety, depression, and school avoidance

5. Differential Diagnosis

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

The differential diagnosis of pediatric headache is broad, but a systematic approach based on the temporal pattern dramatically narrows the possibilities. The vast majority of pediatric headaches are primary headache disorders (migraine and tension-type headache), but secondary causes must be excluded, particularly in young children and when red flags are present.

Key Diagnostic Principle: The temporal pattern is the most important feature for generating the differential diagnosis in pediatric headache:

Acute headache: Think infection, hemorrhage, first migraine, trauma
Acute recurrent: Think primary headache disorders (migraine, tension-type)
Chronic progressive: Think space-occupying lesion, hydrocephalus — URGENT
Chronic non-progressive: Think chronic migraine, chronic tension-type, medication overuse

Acute Headache (First or Single Episode)

Acute headache requires careful evaluation to distinguish benign causes from serious secondary pathology. The “first or worst” headache warrants urgent assessment.

Probability	Condition	Key Features	Red Flags
COMMON (~85%)	Viral upper respiratory infection	Diffuse headache with fever, nasal congestion, sore throat; generally mild; resolves with illness	High fever with severe headache, neck stiffness, altered mental status
	First migraine attack	Moderate-severe, pulsating, with nausea/vomiting, photophobia; family history often positive; child wants to lie down	Thunderclap onset, focal neurological deficits persisting after headache
	Acute sinusitis	Frontal or facial pain, worse with bending forward; nasal congestion; purulent discharge; may have fever	Periorbital swelling/erythema (orbital cellulitis), severe toxicity
	Tension-type headache	Bilateral, pressing/tightening, mild-moderate; often related to stress, sleep deprivation, or missed meals	Severe intensity atypical; should consider other causes
LESS COMMON (~10%)	Post-traumatic headache	Headache within 7 days of head injury; may be associated with dizziness, cognitive symptoms, sleep disturbance	Loss of consciousness, amnesia, vomiting, worsening symptoms, focal deficits
	Streptococcal pharyngitis	Headache with sore throat, fever, cervical lymphadenopathy; no cough; tonsillar exudates	Severe toxicity, trismus (peritonsillar abscess)
	Viral meningitis	Headache with fever, photophobia, neck stiffness; generally less toxic than bacterial; enterovirus common in summer/fall	Altered mental status, seizures, focal deficits suggest encephalitis or bacterial cause
UNCOMMON BUT SERIOUS (~5%)	Bacterial meningitis	Severe headache, high fever, neck stiffness, photophobia, altered mental status; may have petechial rash	Rapid progression, toxic appearance, petechiae/purpura — requires immediate treatment
	Intracranial hemorrhage	Sudden severe headache (“thunderclap”); may have altered consciousness, vomiting, focal deficits; history of trauma or vascular malformation	Thunderclap onset, altered mental status, focal neurological signs, coagulopathy
	Encephalitis	Headache with fever, altered mental status, personality change, seizures; may have focal deficits	Behavioral change, seizures, focal deficits, rapid deterioration
	Hypertensive emergency	Severe headache with markedly elevated blood pressure; may have visual changes, altered mental status, seizures	Severely elevated BP, encephalopathy, retinal changes, renal dysfunction
	Carbon monoxide poisoning	Headache, nausea, dizziness; multiple family members affected; winter months; gas heating	Altered mental status, multiple affected individuals, cherry-red skin (late)

Acute Recurrent Headache (Episodic with Symptom-Free Intervals)

This pattern is characteristic of primary headache disorders. The child is completely well between attacks.

Probability	Condition	Approximate Frequency	Key Distinguishing Features
COMMON (~90%)	Migraine without aura	60-70% of pediatric migraine	Duration 2-72 hours; pulsating; moderate-severe; nausea/vomiting; photo/phonophobia; aggravated by activity; often bilateral in young children; family history positive
COMMON (~90%)	Episodic tension-type headache	Most common primary headache overall	Duration 30 min-7 days; pressing/tightening; mild-moderate; bilateral; NO nausea; may have photo OR phonophobia (not both); NOT aggravated by activity
LESS COMMON (~8%)	Migraine with aura	15-30% of pediatric migraine	Visual aura most common (scotoma, fortification spectra, photopsia); sensory or speech aura possible; aura typically 5-60 minutes before headache
	Childhood periodic syndromes (migraine equivalents)	Common in young children	Cyclic vomiting syndrome, abdominal migraine, benign paroxysmal vertigo, benign paroxysmal torticollis; often evolve to migraine later
	Recurrent sinusitis	Variable	Frontal/facial pain with URI symptoms; purulent discharge; may be overdiagnosed (true “sinus headache” is rare)
	Exertional headache	Uncommon	Headache triggered by physical exertion; pulsating; usually bilateral; lasts minutes to 48 hours; must exclude structural cause on first presentation
UNCOMMON (~2%)	Trigeminal autonomic cephalalgias (cluster headache)	Rare in children (more common post-puberty)	Severe unilateral orbital/temporal pain; autonomic features (tearing, rhinorrhea, ptosis, miosis); attacks 15-180 minutes; restlessness
	Occipital neuralgia	Rare	Shooting/stabbing pain in occipital region; tenderness over greater occipital nerve; may follow trauma or infection
	Epilepsy-related headache	Variable	Ictal or post-ictal headache; may mimic migraine; often has other seizure features; EEG abnormalities

Chronic Progressive Headache — RED FLAG PATTERN

Urgent Evaluation Required

Chronic progressive headache — headaches that are increasing in frequency, severity, or both over weeks to months — is the most concerning temporal pattern. This pattern suggests a space-occupying lesion or other cause of progressively increasing intracranial pressure. Neuroimaging is mandatory.

Condition	Key Features	Associated Signs	Urgency
Brain tumor	Progressive headache over weeks-months; worse in morning; worsened by coughing/straining; may wake child from sleep	Papilledema, focal neurological deficits, personality change, declining school performance, vomiting (especially morning), gait ataxia (posterior fossa)	URGENT
Hydrocephalus	Progressive headache; may be acute in shunt malfunction; morning headache and vomiting classic	Macrocephaly (infants), bulging fontanelle, “setting sun” eyes, papilledema, sixth nerve palsy, altered mental status	URGENT
Idiopathic intracranial hypertension (pseudotumor cerebri)	Daily headache, often worse in morning; visual obscurations (transient visual loss); pulsatile tinnitus; typically overweight adolescent female	Papilledema (required for diagnosis), sixth nerve palsy, visual field defects; normal brain imaging except empty sella, optic nerve sheath dilation	URGENT
Chronic subdural hematoma	Progressive headache following trauma (may be minor or remote); may have subtle personality change	May have subtle focal deficits, altered mental status; history of trauma (may be weeks prior)	URGENT
Brain abscess	Progressive headache; fever may be low-grade or absent; often history of sinusitis, otitis, dental infection, or congenital heart disease	Focal neurological deficits, seizures, signs of primary infection source, papilledema	URGENT
Cerebral venous sinus thrombosis	Progressive headache; may have thunderclap onset; risk factors include dehydration, prothrombotic states, infection, oral contraceptives	Papilledema, focal deficits, seizures, altered mental status	URGENT
Chiari malformation (symptomatic)	Occipital/suboccipital headache; worse with coughing, straining, Valsalva; may be progressive as syrinx develops	Lower cranial nerve dysfunction, upper extremity weakness/sensory changes, gait disturbance	URGENT

Chronic Non-Progressive Headache (Daily or Near-Daily, Stable Intensity)

Chronic daily headache is defined as headache occurring ≥15 days per month for >3 months. While less immediately dangerous than chronic progressive headache, this pattern significantly impacts quality of life and requires careful evaluation.

Step-by-Step Approach to Chronic Non-Progressive Headache:

Step 1: Confirm the pattern is truly non-progressive — if any features suggest worsening, treat as chronic progressive
Step 2: Exclude medication overuse headache — present in up to 30% of adolescents with chronic daily headache
Step 3: Identify the underlying headache type — chronic migraine versus chronic tension-type headache
Step 4: Screen for comorbidities — anxiety, depression, sleep disorders, school avoidance
Step 5: Consider neuroimaging if any atypical features or examination abnormalities

Probability	Condition	Approximate Frequency	Key Distinguishing Features
COMMON (~70%)	Chronic migraine	~40% of chronic daily headache	≥15 headache days/month with ≥8 having migraine features; often evolved from episodic migraine; may have continuous background headache with superimposed severe attacks
COMMON (~70%)	Chronic tension-type headache	~30% of chronic daily headache	≥15 days/month; bilateral, pressing, mild-moderate; no nausea/vomiting; may have mild photophobia OR phonophobia
LESS COMMON (~25%)	Medication overuse headache	Up to 30% of adolescents with chronic daily headache	Daily or near-daily headache in patient using acute medications ≥10-15 days/month; headache worsens with analgesic use; improves with medication withdrawal
LESS COMMON (~25%)	New daily persistent headache	~10% of chronic daily headache	Daily headache from onset (patient can usually identify exact date); often follows viral illness, stressful event, or surgery; unremitting from onset
UNCOMMON (~5%)	Headache attributed to psychiatric disorder	Variable	Headache occurring exclusively during somatization disorder, psychotic disorder, or severe depression; diagnosis of exclusion
	Cervicogenic headache	Rare in children	Unilateral headache radiating from neck; reduced cervical range of motion; triggered by neck movement or sustained posture
	Post-traumatic headache (chronic)	Variable	Headache persisting >3 months after head injury; may have features of migraine or tension-type; often associated with other post-concussive symptoms

Anatomical Approach to Differential Diagnosis

Intracranial — Parenchymal

Brain tumor

Brain abscess

Encephalitis

Demyelinating disease

Stroke (arterial ischemic, hemorrhagic)

Arteriovenous malformation

Intracranial — Extra-axial/CSF

Meningitis (bacterial, viral, fungal)

Subarachnoid hemorrhage

Subdural hematoma

Epidural hematoma

Hydrocephalus

Idiopathic intracranial hypertension

Intracranial hypotension

Extracranial — Head and Neck

Sinusitis

Otitis media/mastoiditis

Dental pathology

Temporomandibular joint dysfunction

Refractive error

Glaucoma (rare in children)

Cervical spine pathology

Systemic Causes

Viral illness (systemic)

Hypertension

Anemia

Hypoglycemia

Carbon monoxide poisoning

Medication side effects

Substance use/withdrawal

Sleep disorders

Age-Based Differential Diagnosis

Age Group	Common Causes	Special Considerations
Infants (0-12 months)	Meningitis, hydrocephalus, intracranial hemorrhage (including nonaccidental trauma), viral illness	Cannot verbalize headache; present with irritability, poor feeding, bulging fontanelle, vomiting; high suspicion for secondary causes required
Toddlers (1-3 years)	Viral illness, otitis media, meningitis, brain tumor (posterior fossa tumors peak in this age), hydrocephalus	Limited ability to describe symptoms; may hold head, bang head, or show behavioral changes; brain tumors more common than in older children
Preschool (3-5 years)	Viral illness, migraine (can begin at this age), sinusitis, brain tumor	Migraine may present as episodic abdominal pain or vomiting; beginning to localize and describe pain
School age (6-11 years)	Migraine, tension-type headache, viral illness, sinusitis, post-traumatic headache	Primary headache disorders become predominant; school-related stress emerges as factor; can provide reliable history
Adolescents (12-18 years)	Migraine, tension-type headache, chronic daily headache, medication overuse headache, idiopathic intracranial hypertension	Adult-like presentations; medication overuse common; screen for depression, anxiety, substance use; IIH typically in overweight females

Drug-Induced Headache

Medication/Substance	Mechanism	Characteristics	Management
Stimulants (methylphenidate, amphetamines)	Vasoconstriction, sympathetic activation	Common in children with ADHD; often dose-related; may occur at initiation or with dose increase	Dose reduction, medication timing adjustment, or switch to alternative stimulant
Analgesic overuse (paracetamol, NSAIDs, triptans)	Central sensitization, altered pain modulation	Daily or near-daily headache; ≥10-15 days/month of analgesic use; headache returns as medication wears off	Gradual withdrawal of overused medication with bridge therapy
Oral contraceptives	Hormonal effects on vascular tone and pain pathways	New onset or worsening of migraine; may occur during hormone-free interval	Consider continuous dosing or progestin-only options; contraindicated in migraine with aura
Isotretinoin	Idiopathic intracranial hypertension	Daily headache, visual symptoms, papilledema; typically within first 2 months of treatment	Discontinue isotretinoin; treat IIH; ophthalmology evaluation
Tetracyclines (doxycycline, minocycline)	Idiopathic intracranial hypertension	Daily headache, visual symptoms; used for acne in adolescents	Discontinue medication; treat IIH
Corticosteroids	During use: various mechanisms; Withdrawal: intracranial hypotension, adrenal insufficiency	Headache during use or upon withdrawal; dose-dependent	Gradual taper if discontinuing; treat underlying cause
Caffeine withdrawal	Rebound vasodilation after chronic vasoconstriction	Bilateral, throbbing headache 12-24 hours after last caffeine; common in adolescents with high caffeine intake	Gradual caffeine reduction; or treat with caffeine if withdrawal is cause
Nitrates (for cardiac conditions)	Vasodilation	Immediate or delayed headache after administration	Dose adjustment; tolerance often develops

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

Clinical Clue	Think This First	Next Step
Thunderclap onset (maximal in seconds)	Subarachnoid hemorrhage, arterial dissection, cerebral venous thrombosis	Emergent CT head; if negative, lumbar puncture
Headache waking child from sleep	Increased intracranial pressure (tumor, hydrocephalus)	Urgent neuroimaging (MRI preferred)
Morning headache with vomiting	Posterior fossa tumor, hydrocephalus	Urgent neuroimaging; fundoscopy for papilledema
Headache worse with coughing/straining	Chiari malformation, space-occupying lesion	MRI brain and craniocervical junction
Occipital headache in young child	Posterior fossa pathology	MRI brain with attention to posterior fossa
Headache + fever + neck stiffness	Meningitis	Emergent lumbar puncture (after CT if focal signs); empiric antibiotics
Headache + fever + altered mental status	Encephalitis, meningitis	Emergent imaging, lumbar puncture; empiric acyclovir and antibiotics
Daily headache + analgesic use ≥10-15 days/month	Medication overuse headache	Detailed medication diary; plan for withdrawal
Daily headache + obesity + visual symptoms (adolescent female)	Idiopathic intracranial hypertension	Fundoscopy; MRI/MRV; lumbar puncture with opening pressure
Episodic headache + nausea + wants to lie in dark room	Migraine	Clinical diagnosis; neuroimaging only if red flags
Bilateral pressing headache + school stress + no nausea	Tension-type headache	Clinical diagnosis; address triggers; reassurance
Headache + new onset seizures	Space-occupying lesion, encephalitis, vascular malformation	Urgent neuroimaging; EEG
Headache following head injury	Post-traumatic headache; intracranial hemorrhage if severe injury	CT if red flags; otherwise clinical monitoring

6. Diagnostic Investigations

A stepwise, evidence-based approach guided by clinical suspicion

The diagnosis of primary headache disorders (migraine, tension-type headache) is clinical, based on history and a normal neurological examination. Investigations are not required for every child with headache, but are indicated when secondary causes are suspected based on red flags, atypical features, or abnormal examination findings. The key principle is to investigate thoughtfully based on clinical suspicion, avoiding both unnecessary testing and missed serious diagnoses.

Key Principle: Neuroimaging is NOT routinely indicated in children with recurrent headaches, normal neurological examination, and no red flags. However, it IS indicated when:

Chronic progressive headache pattern
Any neurological abnormality on examination (including papilledema)
Red flag features in history
Age less than 5 years with new recurrent headache
Change in established headache pattern
Occipital headache in young children
Headache causing awakening from sleep

Baseline Assessment for All Children with Headache

Assessment	Purpose	What to Look For	Practical Points
Complete history and examination	Establish temporal pattern; identify red flags; characterize headache	Pattern (acute, acute recurrent, chronic progressive, chronic non-progressive); warning signs; neurological abnormalities	Most important “investigation”; sufficient for diagnosis of primary headache in most cases
Blood pressure measurement	Screen for hypertension as cause or contributor	Elevated BP for age, sex, and height	Use appropriate cuff size; compare to pediatric percentiles; repeat if elevated
Fundoscopic examination	Assess for papilledema (increased intracranial pressure)	Blurred disc margins, elevated disc, absent venous pulsations, hemorrhages	Essential in all children with headache; ophthalmology referral if unable to visualize or abnormality suspected
Visual acuity testing	Screen for refractive error	Decreased acuity for age	Age-appropriate method; referral to optometry/ophthalmology if abnormal
Growth parameters	Screen for chronic disease; assess head circumference in young children	Weight loss (concerning for malignancy); macrocephaly (hydrocephalus); obesity (IIH risk)	Plot on appropriate growth charts; calculate BMI in older children

Neuroimaging: When and What to Order

MRI versus CT in Pediatric Headache

MRI is preferred for most indications in pediatric headache because:

Superior soft tissue resolution for detecting tumors, Chiari malformation, white matter abnormalities
Better visualization of posterior fossa (common site of pediatric brain tumors)
No ionizing radiation (important in children)
Can add MRA/MRV to evaluate vessels if indicated

CT is preferred when:

Emergent evaluation needed (acute trauma, suspected hemorrhage, acute neurological deterioration)
MRI not readily available
Child cannot tolerate MRI (sedation contraindicated or not available)
Evaluating for acute blood (CT more sensitive in first 24 hours)

Clinical Scenario	Imaging Modality	Specific Protocol	Urgency
Chronic progressive headache	MRI brain with and without contrast	Include posterior fossa views; contrast to evaluate for tumor, infection, inflammation	URGENT (within 24-48 hours)
Thunderclap headache	CT head without contrast (first); if negative, lumbar puncture	Non-contrast CT to detect acute blood; LP for xanthochromia if CT negative	EMERGENT
Headache with papilledema	MRI brain with contrast + MRV	Evaluate for mass, hydrocephalus, venous thrombosis; MRV for cerebral venous sinus thrombosis	URGENT (within 24 hours)
Headache with focal neurological signs	MRI brain with and without contrast	Evaluate for mass, stroke, demyelination, vascular malformation	URGENT
Headache worse with coughing/Valsalva	MRI brain and craniocervical junction	Specific views of craniocervical junction for Chiari malformation; CSF flow study if Chiari confirmed	SOON (within 1-2 weeks)
Post-traumatic headache with red flags	CT head without contrast (acute); MRI if persistent symptoms	CT for acute hemorrhage; MRI for chronic post-traumatic changes	CT emergent if red flags; MRI can be elective
Suspected idiopathic intracranial hypertension	MRI brain with contrast + MRV	Look for empty sella, optic nerve sheath dilation, transverse sinus stenosis; MRV to exclude venous thrombosis	URGENT
Recurrent headache, normal exam, age ≥5 years, no red flags	Imaging NOT routinely indicated	Clinical diagnosis of primary headache	May consider for parental reassurance after discussion

Lumbar Puncture

Indication	Key Measurements	What to Look For	Important Considerations
Suspected meningitis/encephalitis	Opening pressure, cell count, protein, glucose, Gram stain, culture, PCR	Pleocytosis, elevated protein, low glucose (bacterial); CSF PCR for HSV, enterovirus	CT before LP if papilledema, focal signs, or altered mental status; don’t delay antibiotics for LP
Suspected subarachnoid hemorrhage (CT negative)	Xanthochromia, red blood cells, spectrophotometry	Xanthochromia (yellow discoloration from bilirubin); RBCs not clearing in successive tubes	Wait 6-12 hours after headache onset for xanthochromia to develop; spectrophotometry more sensitive than visual inspection
Suspected idiopathic intracranial hypertension	Opening pressure (most critical); cell count, protein, glucose	Elevated opening pressure (>28 cm H2O in children, >25 cm H2O in adults); normal CSF composition	Measure with child in lateral decubitus, legs extended; therapeutic as well as diagnostic (removes CSF)
Suspected intracranial hypotension	Opening pressure	Low opening pressure (<6 cm H2O)	May worsen headache; consider CT myelography to locate CSF leak

Contraindications to Lumbar Puncture

Obtain CT head BEFORE lumbar puncture if any of the following are present:

Papilledema or other signs of increased intracranial pressure
Focal neurological deficits
Altered level of consciousness (GCS <13)
New onset seizures
Immunocompromised state
Signs of impending herniation

Do not delay empiric antibiotics for suspected bacterial meningitis while awaiting CT or LP.

Laboratory Investigations

Routine blood tests are not indicated for typical primary headache disorders but may be helpful in specific clinical scenarios:

Test	When to Order	What to Look For	Clinical Relevance
Complete blood count	Suspected infection, anemia, malignancy	Anemia (can cause headache); leukocytosis (infection); abnormal counts (leukemia)	Anemia is treatable cause of headache; abnormal CBC may indicate systemic illness
Inflammatory markers (ESR, CRP)	Suspected infection, inflammatory condition	Elevated ESR/CRP suggests inflammation or infection	May be elevated in meningitis, abscess, vasculitis
Metabolic panel	Altered mental status, suspected metabolic cause	Electrolyte abnormalities, renal function, glucose	Hyponatremia, hypoglycemia, uremia can cause headache
Thyroid function tests	Symptoms suggestive of thyroid dysfunction	Hypothyroidism or hyperthyroidism	Thyroid dysfunction can contribute to headache; treatable
Coagulation studies	Suspected intracranial hemorrhage, before LP	Coagulopathy	Important before LP; may indicate underlying bleeding disorder
Blood gas (venous or arterial)	Suspected carbon monoxide poisoning	Carboxyhemoglobin level	CO poisoning causes headache; requires specific testing (co-oximetry)
Lead level	Risk factors for lead exposure; chronic headache with developmental concerns	Elevated lead level	Lead toxicity can cause headache and encephalopathy

Targeted Investigations by Suspected Etiology

If Suspecting Migraine

Diagnosis

Clinical diagnosis: Based on ICHD-3 criteria; no specific test confirms migraine
Neuroimaging: NOT routinely indicated if typical history, normal examination, no red flags
Headache diary: Valuable for confirming pattern and identifying triggers

When to Consider Imaging

Atypical features (e.g., always same side, prolonged aura)
Abnormal neurological examination
Change in established headache pattern
Age less than 5 years
Parental anxiety not relieved by reassurance

If Suspecting Increased Intracranial Pressure

First-Line Investigations

Fundoscopy: Look for papilledema — mandatory
MRI brain with contrast: Evaluate for mass, hydrocephalus
MRV: Evaluate for cerebral venous sinus thrombosis

Second-Line Investigations

Lumbar puncture: Opening pressure measurement (after imaging); therapeutic in IIH
Visual field testing: Formal perimetry to document visual loss
OCT (optical coherence tomography): Quantitative assessment of optic nerve edema

If Suspecting Infection (Meningitis/Encephalitis)

Essential Investigations

Lumbar puncture: Cell count, protein, glucose, Gram stain, culture, PCR panel
Blood cultures: Before antibiotics if possible
Complete blood count: Leukocytosis, left shift
CT head: Before LP if contraindications present

CSF Analysis — Key Values

Bacterial meningitis: WBC >1000/μL (neutrophils), protein >100 mg/dL, glucose <40 mg/dL (or CSF:serum ratio <0.4)
Viral meningitis: WBC 10-500/μL (lymphocytes), protein 50-100 mg/dL, glucose normal
HSV encephalitis: May have RBCs; HSV PCR positive

If Suspecting Vascular Cause

Suspected Condition	Primary Investigation	Additional Testing
Subarachnoid hemorrhage	CT head without contrast (sensitivity ~95% in first 6 hours)	Lumbar puncture if CT negative; CT angiography to identify aneurysm
Cerebral venous sinus thrombosis	MRI brain + MRV	CT venography if MRI not available; thrombophilia workup
Arteriovenous malformation	MRI brain with and without contrast	MRA or conventional angiography for detailed vascular anatomy
Arterial dissection	MRI/MRA of head and neck	CT angiography; fat-saturated T1 MRI for intramural hematoma
Stroke	MRI brain with DWI (diffusion-weighted imaging)	MRA; echocardiogram; hypercoagulability workup

Other Specialized Investigations

Investigation	Indication	What It Shows	Pediatric Considerations
EEG (Electroencephalography)	Headache with seizures or altered awareness; suspected epilepsy-related headache	Epileptiform abnormalities; may show slowing in encephalopathy	Not indicated for routine headache evaluation; does not diagnose migraine
Polysomnography (sleep study)	Suspected sleep disorder contributing to headache; snoring, witnessed apneas	Sleep apnea, periodic limb movements, other sleep disorders	Sleep disorders common in children with chronic headache; treatable cause
Sinus CT	Suspected complicated sinusitis; recurrent sinusitis; pre-operative evaluation	Sinus opacification, air-fluid levels, bony changes, complications	Not indicated for routine “sinus headache” (usually migraine); reserve for complicated cases
Ophthalmology evaluation	Papilledema, visual symptoms, suspected refractive error, IIH	Formal visual fields, OCT, refraction, dilated fundus examination	Essential for documenting and monitoring papilledema; visual field testing may be difficult in young children
Psychological assessment	Chronic daily headache; suspected anxiety, depression, school avoidance	Screen for comorbid anxiety, depression, functional impairment	High comorbidity of anxiety and depression with chronic headache; impacts treatment planning

Empiric Treatment Trials as Diagnostic Tools

Therapeutic Trials in Pediatric Headache

In some situations, response to treatment can support the diagnosis:

Triptan response: Good response to a triptan supports migraine diagnosis, though not all migraines respond
Medication withdrawal: If chronic daily headache improves after stopping frequent analgesics, medication overuse headache is confirmed
Treatment of underlying condition: If headache resolves with treatment of sinusitis, refractive error correction, or sleep disorder management, the causal relationship is supported

Important: Empiric trials should not replace appropriate investigation when red flags are present.

Summary: Investigation Algorithm

Stepwise Approach to Investigating Pediatric Headache:

All children: Complete history, neurological examination, blood pressure, fundoscopy, visual acuity
If red flags present: Urgent neuroimaging (MRI preferred; CT if emergent or MRI unavailable)
If chronic progressive pattern: MRI brain with contrast — URGENT
If fever + headache + meningeal signs: Lumbar puncture (CT first if contraindications); empiric antibiotics
If thunderclap headache: CT head → if negative, lumbar puncture for xanthochromia
If papilledema present: MRI brain + MRV → lumbar puncture with opening pressure
If typical primary headache, normal exam, no red flags: Clinical diagnosis; neuroimaging NOT routinely needed
If chronic daily headache: Exclude medication overuse; consider psychological assessment

7. Pattern Recognition and Clinical Decision-Making

Practical algorithms and decision pathways for pediatric headache

Clinical decision-making in pediatric headache requires integrating the history, examination findings, and temporal pattern to determine the urgency of evaluation, need for investigations, and appropriate management pathway. This section provides practical algorithms to guide these decisions at the point of care.

Step 1: Is This Urgent?

The first and most critical decision is determining the urgency of the clinical situation. Use this triage table to guide immediate management:

Clinical Scenario	Urgency Level	Immediate Action	Disposition
Altered mental status + headache	EMERGENT	ABCs, IV access, blood glucose, consider empiric antibiotics/acyclovir if infection suspected	Emergency department; ICU if unstable
Thunderclap headache (maximal in seconds)	EMERGENT	Emergent CT head; if negative, lumbar puncture	Emergency department
Headache + fever + neck stiffness	EMERGENT	IV antibiotics immediately; LP when safe (CT first if contraindications)	Emergency department; admission
Headache + new focal neurological deficit	EMERGENT	Emergent neuroimaging (CT if unstable, MRI if stable)	Emergency department
Headache + papilledema	URGENT	MRI brain + MRV within 24 hours; ophthalmology consultation	Admission or urgent outpatient evaluation
Chronic progressive headache pattern	URGENT	MRI brain with contrast within 24-48 hours; fundoscopy	Urgent outpatient or emergency department based on severity
Headache waking child from sleep	URGENT	MRI brain within 1 week; fundoscopy	Urgent outpatient evaluation
First or worst headache	URGENT	Thorough evaluation; consider neuroimaging based on features	Emergency department or same-day evaluation
New headache in child age <5 years	URGENT	Lower threshold for investigation; neuroimaging recommended	Urgent outpatient or emergency department
Recurrent episodic headache, normal exam, no red flags	ROUTINE	Clinical evaluation; headache diary; lifestyle counseling	Outpatient follow-up
Chronic daily headache, stable, normal exam	ROUTINE	Evaluate for medication overuse; screen for anxiety/depression	Outpatient follow-up; consider neurology referral

Step 2: Classify by Temporal Pattern

Once urgency is established, classify the headache by temporal pattern to guide the diagnostic and management approach:

Acute (Single Episode)

Definition: First severe headache or new headache type

Action: Proceed to Algorithm A

Key Question: Is this a primary headache or a symptom of underlying pathology?

Acute Recurrent

Definition: Episodic headaches with symptom-free intervals

Action: Proceed to Algorithm B

Key Question: Does this fit criteria for migraine or tension-type headache?

Chronic Progressive

Definition: Headaches increasing in frequency and/or severity

Action: Proceed to Algorithm C — URGENT

Key Question: Is there a space-occupying lesion or other cause of raised intracranial pressure?

Chronic Non-Progressive

Definition: Daily or near-daily headaches of stable intensity

Action: Proceed to Algorithm D

Key Question: Is there medication overuse? What is the underlying headache type?

Step 3: Follow the Appropriate Algorithm

Algorithm A: Acute Headache (First or New Episode)

Clinical Scenario	Most Likely Diagnosis	Action
Headache + fever + URI symptoms, normal neuro exam	Viral illness	Supportive care; analgesia; safety-net advice; follow-up if not improving in 5-7 days
Headache + fever + neck stiffness/photophobia	Meningitis	Emergent LP (CT first if contraindications); empiric antibiotics; admission
Moderate-severe headache + nausea + photophobia, wants to lie down, family history positive	First migraine attack	Trial of analgesia (ibuprofen ± antiemetic); quiet dark environment; reassurance; headache diary; follow-up
Thunderclap onset, severe	Subarachnoid hemorrhage until proven otherwise	Emergent CT head; if negative, LP for xanthochromia
Headache following head trauma + any red flag	Intracranial hemorrhage	CT head; neurosurgical consultation if positive; admission for observation
Headache following minor head trauma, no red flags	Post-traumatic headache	Clinical observation; discharge with head injury instructions; follow-up if symptoms persist
Frontal headache + nasal congestion + purulent discharge + facial tenderness	Acute sinusitis	Analgesia; consider antibiotics if bacterial criteria met; decongestants; follow-up

Algorithm B: Acute Recurrent Headache

Clinical Scenario	Most Likely Diagnosis	Action
Episodic moderate-severe headache + nausea/vomiting + photo/phonophobia + aggravated by activity + family history	Migraine without aura	Confirm diagnosis clinically; headache diary; lifestyle optimization; acute treatment plan; consider preventive if frequent
Episodic headache with preceding visual symptoms (fortifications, scotoma) lasting 5-60 minutes	Migraine with aura	Confirm diagnosis; reassure about aura; treatment as for migraine; note: avoid estrogen-containing contraceptives
Bilateral pressing headache, mild-moderate, no nausea, able to continue activities	Episodic tension-type headache	Reassurance; identify triggers (stress, sleep, posture); simple analgesia; lifestyle counseling
Episodic severe abdominal pain + nausea/vomiting + pallor, symptom-free between, family history of migraine	Abdominal migraine	Recognize as migraine equivalent; treat as migraine; often evolves to typical migraine with age
Episodic severe vomiting (1-5 days) + pallor, symptom-free between, family history of migraine	Cyclic vomiting syndrome	Recognize as migraine equivalent; manage vomiting; IV fluids if severe; migraine preventives may help
Headache triggered by exertion, pulsating, bilateral, first episode	Exertional headache (primary vs secondary)	First episode requires neuroimaging to exclude structural cause; if normal, reassure; NSAIDs before exercise may help

Algorithm C: Chronic Progressive Headache — URGENT PATHWAY

This Pattern Requires Urgent Neuroimaging

Chronic progressive headache — headaches that are increasing in frequency, severity, or both over weeks to months — suggests a space-occupying lesion or other serious intracranial pathology until proven otherwise.

Step	Action	If Positive	If Negative
1. Fundoscopy	Look for papilledema	Confirms raised ICP; urgent MRI + MRV; neurosurgery/neurology consultation	Does not exclude raised ICP; proceed to imaging
2. MRI brain with contrast	Evaluate for mass, hydrocephalus, other structural cause	Manage based on findings; urgent subspecialty referral	Consider MRV to exclude venous thrombosis; if normal, reassess history
3. MRV (if MRI normal)	Evaluate for cerebral venous sinus thrombosis	Anticoagulation; hematology consultation	Consider LP with opening pressure if IIH suspected
4. LP with opening pressure	Measure opening pressure; CSF analysis	Elevated OP: diagnose IIH; manage accordingly	Reassess temporal pattern; may be chronic non-progressive

Algorithm D: Chronic Non-Progressive (Daily) Headache

Step	Question	If Yes	If No
1. Verify pattern	Is it truly non-progressive (stable intensity)?	Continue algorithm	Treat as chronic PROGRESSIVE; urgent imaging
2. Check medication use	Is the child taking analgesics ≥10-15 days/month?	Medication overuse headache likely; plan withdrawal	Continue to identify headache type
3. Identify headache type	Does it have migrainous features (≥8 days/month)?	Chronic migraine; initiate preventive treatment	Likely chronic tension-type headache
4. Screen for comorbidities	Is there anxiety, depression, or sleep disorder?	Address comorbidities; may need psychological intervention	Continue management
5. Consider imaging	Any atypical features or examination abnormalities?	MRI brain to exclude structural cause	Clinical management without imaging

“What Do I Do If…” Decision Reference

Clinical Situation	Immediate Action	Next Step
Child presents during acute migraine attack	Administer ibuprofen (10 mg/kg) or paracetamol (15 mg/kg); antiemetic if vomiting (ondansetron); provide quiet, dark environment	Reassess in 1-2 hours; if not improving, consider triptan (if age-appropriate) or IV fluids; discharge with follow-up plan
Parent is anxious and requesting brain scan for typical migraine	Acknowledge concerns; explain that clinical diagnosis is reliable when features are typical and exam is normal	Offer to reconsider imaging if pattern changes or treatment fails; provide clear safety-net advice; document discussion
Cannot visualize fundus adequately	Attempt with mydriatic drops if no contraindication; try handheld ophthalmoscope or smartphone fundoscopy	If still unable and clinical concern exists, obtain ophthalmology consultation or proceed to neuroimaging
Child has chronic daily headache and is missing significant school	Assess for medication overuse; screen for anxiety and depression; evaluate sleep	Multidisciplinary approach: neurology, psychology, school liaison; develop graded return-to-school plan; consider preventive medication
MRI shows incidental finding (e.g., pineal cyst, arachnoid cyst)	Review with radiology; most small cysts are incidental and not causing headache	If cyst unlikely to be causative, treat the primary headache disorder; neurosurgery consultation only if concerning features
Adolescent female on oral contraceptives develops migraine with aura	Stop estrogen-containing contraceptives immediately (increased stroke risk)	Switch to progestin-only or non-hormonal contraception; refer to gynecology if needed; manage migraine with preventives
Child with VP shunt presents with headache	High suspicion for shunt malfunction; check shunt series (X-ray); CT head to assess ventricle size	Urgent neurosurgery consultation if shunt malfunction suspected; do not assume primary headache
Child has headache only on school days	Explore school-related stressors; assess for anxiety; rule out vision problems	Address underlying factors; visual assessment; do not dismiss as “not real” — may be tension-type or migraine triggered by stress

When to Refer to Pediatric Neurology

Urgent Referral

Chronic progressive headache pattern
Papilledema or other signs of raised ICP
Abnormal neurological examination
Abnormal neuroimaging findings
New daily persistent headache
Headache with new seizures

Routine Referral

Frequent migraine not responding to first-line preventives
Chronic daily headache requiring multidisciplinary management
Diagnostic uncertainty despite thorough evaluation
Hemiplegic migraine or other complex migraine variants
Headache significantly impacting school attendance/quality of life
Medication overuse headache requiring supervised withdrawal

Troubleshooting Refractory Headache

When Treatment Is Not Working, Ask These Questions

Is the diagnosis correct? Re-review history; consider alternative diagnoses; has the pattern changed?
Is there medication overuse? Check analgesic frequency; overuse can perpetuate chronic headache
Is there an underlying secondary cause? Consider imaging if not already done; re-examine for papilledema
Are comorbidities being addressed? Screen for anxiety, depression, sleep disorders
Is the treatment being taken correctly? Check adherence; ensure correct dose and timing; is acute medication being taken early enough?
Was preventive medication given adequate trial? At least 2-3 months at therapeutic dose before concluding failure
Are lifestyle factors optimized? Sleep, hydration, regular meals, exercise, screen time, stress management
Are expectations realistic? Goal is to reduce frequency and severity, not necessarily eliminate all headaches

8. Clinical Pearls and Pitfalls

Practical wisdom — learn from successes and avoid common mistakes

Must-Know Clinical Pearls

Temporal pattern is king: The single most important piece of information is the temporal pattern — acute, acute recurrent, chronic progressive, or chronic non-progressive. This guides the entire diagnostic approach and determines urgency.

Migraine looks different in young children: In children under 10, migraine is often bilateral (not unilateral), shorter in duration (may be as brief as 1-2 hours), and may present with abdominal symptoms. Photophobia and phonophobia may be inferred from behavior rather than verbalized.

Family history is powerful: 50-90% of children with migraine have a first-degree relative with migraine. Ask specifically — many parents don’t recognize their own “sinus headaches” or “stress headaches” as migraine.

Lifestyle factors are foundational: Sleep, hydration, regular meals, and stress management are not just adjuncts — they are first-line treatment. Many children improve significantly with lifestyle optimization alone.

Treat acute migraine early: Analgesics (ibuprofen, paracetamol) work best when given at headache onset. Delayed treatment leads to central sensitization and medication failure. Counsel families on early intervention.

The headache diary is diagnostic: A prospective headache diary reveals patterns that retrospective history cannot. It helps identify triggers, confirms temporal pattern, tracks treatment response, and detects medication overuse.

Normal examination is reassuring: Most primary headaches have completely normal neurological examinations. A thorough normal examination, combined with typical history and no red flags, provides strong reassurance without the need for imaging.

Brain tumors rarely present with headache alone: While headache is common in pediatric brain tumors (62%), it is rarely the only symptom. Look for associated features: vomiting (especially morning), personality change, gait disturbance, visual changes, declining school performance.

Fundoscopy is mandatory: Every child with headache deserves a fundoscopic examination. Papilledema changes management urgently. If you cannot see the fundus and there is clinical concern, refer for ophthalmology or proceed to imaging.

Medication overuse is common and treatable: Up to 30% of adolescents with chronic daily headache have medication overuse. Always count medication days. Withdrawal (with appropriate bridge therapy) often dramatically improves headache frequency.

Critical Pitfalls to Avoid

Missing the chronic progressive pattern: This is the most dangerous mistake. A headache that is progressively worsening over weeks to months requires urgent neuroimaging regardless of other features. Do not assume primary headache without excluding secondary causes in this pattern.

Skipping the fundoscopic examination: Failing to check for papilledema can miss life-threatening raised intracranial pressure. Even if difficult in an uncooperative child, document attempts and have a low threshold for ophthalmology referral or imaging.

Assuming “sinus headache” in children: True sinus headache requires objective evidence of sinusitis. Most children diagnosed with “sinus headache” actually have migraine. Frontal location alone does not indicate sinus disease — migraine is commonly frontal in children.

Ignoring medication overuse: Prescribing preventive medications for chronic daily headache without addressing medication overuse will fail. The overused analgesics must be withdrawn for any preventive to work effectively.

Dismissing headache in young children: Children under 5 years with recurrent headache have a higher likelihood of secondary causes. The threshold for investigation should be lower, not higher, in this age group.

Over-reliance on CT scan: CT may miss posterior fossa tumors, Chiari malformation, white matter disease, and early space-occupying lesions. When imaging is indicated for chronic or concerning headache, MRI is the preferred modality.

Treating chronic headache with only acute medications: Chronic migraine and chronic tension-type headache require preventive treatment. Relying solely on acute analgesics leads to medication overuse and perpetuates the chronic cycle.

Missing psychiatric comorbidity: Anxiety and depression are highly comorbid with chronic headache in children and adolescents. Failing to screen for and address these conditions leads to treatment failure and continued disability.

Assuming normal imaging excludes serious disease: Normal imaging at one point in time does not guarantee future safety. If headache pattern changes or new symptoms develop, re-evaluate and consider repeat imaging.

Stopping preventives too early: Preventive medications require 2-3 months at therapeutic dose to assess efficacy. Stopping after a few weeks because “it’s not working” is premature. Also, taper gradually rather than abrupt discontinuation.

Key Takeaways

Temporal pattern first: Classify every headache as acute, acute recurrent, chronic progressive, or chronic non-progressive — this determines urgency and guides the entire approach.
Chronic progressive = urgent imaging: This pattern suggests space-occupying lesion until proven otherwise. MRI is mandatory.
Primary headache is the norm: Migraine and tension-type headache account for the vast majority of pediatric headaches. With typical history, normal examination, and no red flags, the diagnosis is clinical.
Fundoscopy is essential: Examine the fundi in every child with headache. Papilledema indicates raised intracranial pressure and requires urgent evaluation.
Young children are different: Children under 5 years have higher rates of secondary headache. Migraine presents differently in young children (bilateral, shorter, abdominal symptoms).
Family history supports diagnosis: A positive family history of migraine strongly supports the diagnosis and provides reassurance to families.
Lifestyle is first-line treatment: Sleep hygiene, hydration, regular meals, and stress management should be addressed before or alongside any medication.
Watch for medication overuse: Always count analgesic days. Medication overuse headache is common in adolescents and requires withdrawal for improvement.
Screen for comorbidities: Anxiety, depression, and sleep disorders commonly accompany chronic headache and must be addressed for successful treatment.
MRI over CT when imaging is indicated: MRI provides superior evaluation of posterior fossa (common tumor location), white matter, and is radiation-free.
Reassurance is therapeutic: A thorough evaluation with clear explanation and reassurance reduces anxiety and often improves outcomes, even without medication.
Follow-up is essential: Establish a follow-up plan. Patterns can change, and what appears to be primary headache may evolve to reveal secondary pathology.

Quick Reference Algorithm

Systematic Approach to Pediatric Headache:

Assess urgency: Is there altered mental status, fever with meningism, thunderclap onset, or acute focal deficit? → Emergent evaluation
Identify temporal pattern: Acute, acute recurrent, chronic progressive, or chronic non-progressive?
Screen for red flags: Review history for warning signs; perform complete neurological examination including fundoscopy
Chronic progressive pattern? → Urgent MRI brain with contrast
Red flags present? → Neuroimaging (MRI preferred) based on specific concern
Typical primary headache pattern + normal exam + no red flags? → Clinical diagnosis; imaging NOT routinely required
Classify headache type: Migraine, tension-type, or other; use ICHD-3 criteria
Initiate management: Lifestyle optimization; acute treatment plan; preventive medication if frequent/disabling
Address comorbidities: Screen for anxiety, depression, sleep disorders, medication overuse
Establish follow-up: Headache diary; reassess pattern and treatment response; refer if refractory or atypical

Red Flags Summary — Rapid Reference

Red Flag	Concern	Action
Chronic progressive pattern	Space-occupying lesion, hydrocephalus	Urgent MRI
Thunderclap onset	Subarachnoid hemorrhage, vascular event	Emergent CT; LP if CT negative
Papilledema	Raised intracranial pressure	Urgent MRI + MRV
Focal neurological signs	Structural lesion, stroke	Urgent neuroimaging
Altered mental status	Encephalitis, meningitis, herniation	Emergent evaluation
Fever + meningism	Meningitis	LP; empiric antibiotics
Wakes child from sleep	Raised ICP	MRI within 1 week
Worse with Valsalva	Chiari malformation, mass	MRI brain + craniocervical junction
Age <5 years	Higher rate of secondary causes	Lower threshold for imaging
Occipital location (young child)	Posterior fossa lesion	MRI with posterior fossa views