Clinical Approach to Dizziness and Vertigo
Comprehensive Practical Framework1. Symptom Overview
Understanding the clinical significance and classification of dizziness and vertigo
Dizziness is one of the most common presenting complaints in primary care and emergency medicine, accounting for approximately 5% of all clinic visits and 4% of emergency department presentations. It affects roughly 15-20% of adults annually, with prevalence increasing significantly with age—reaching 30% in those over 65 years. The symptom carries substantial morbidity, being associated with falls, anxiety, depression, and functional impairment. Despite its frequency, dizziness remains one of the most challenging symptoms to evaluate due to its subjective nature and broad differential diagnosis spanning multiple organ systems.
Definition
Dizziness is an umbrella term encompassing various sensations of altered spatial orientation or balance. Vertigo specifically refers to the illusory perception of movement (usually spinning) of oneself or the environment, arising from asymmetric input within the vestibular system. Understanding this distinction is fundamental—vertigo indicates vestibular pathology, while other dizziness types suggest alternative mechanisms.
Classification by Symptom Type
The first and most critical step in evaluating dizziness is determining which of the four classic subtypes the patient is experiencing. While traditional teaching emphasized this distinction, recent evidence suggests patients often have difficulty categorizing their symptoms, and the symptom type may change with repeated questioning. Nevertheless, understanding these categories remains clinically useful.
| Symptom Type | Description | Typical Causes | Key Questions |
|---|---|---|---|
| Vertigo | Illusory sense of spinning or motion; world moving around patient or patient moving in space | Benign paroxysmal positional vertigo, vestibular neuritis, Menière disease, posterior circulation stroke | “Does the room spin around you?” |
| Presyncope | Sensation of impending faint; lightheadedness with feeling of losing consciousness | Orthostatic hypotension, cardiac arrhythmias, vasovagal episodes, hypovolemia | “Do you feel like you might pass out?” |
| Disequilibrium | Sense of imbalance or unsteadiness, particularly when walking; no head sensation | Peripheral neuropathy, cerebellar disease, parkinsonism, multisensory deficit | “Do you feel unsteady on your feet?” |
| Non-specific dizziness | Vague lightheadedness, floating sensation, or “wooziness” not fitting other categories | Anxiety disorders, hyperventilation, medication effects, chronic subjective dizziness | “Can you describe the sensation in other words?” |
Classification by Duration and Timing
The temporal pattern of dizziness provides crucial diagnostic information. Duration, frequency, and triggers help narrow the differential significantly.
| Category | Duration | Common Causes | Clinical Significance |
|---|---|---|---|
| Seconds to less than 1 minute | Brief episodes, often triggered | Benign paroxysmal positional vertigo, orthostatic hypotension, cardiac arrhythmias | Usually benign; triggered episodes suggest positional vertigo or orthostasis |
| Minutes to hours | Prolonged episodes with full recovery | Menière disease, vestibular migraine, transient ischemic attack, panic attacks | Episodic vestibular syndromes; requires careful evaluation for vascular causes |
| Days to weeks | Acute prolonged vertigo | Vestibular neuritis, labyrinthitis, cerebellar stroke, multiple sclerosis | Acute vestibular syndrome—must distinguish peripheral from central causes |
| Chronic (greater than 3 months) | Persistent or frequently recurrent | Persistent postural-perceptual dizziness, bilateral vestibulopathy, medication effects | Often multifactorial; may require multidisciplinary approach |
Peripheral Versus Central Vestibular Disorders
For patients with true vertigo, distinguishing peripheral (inner ear or vestibular nerve) from central (brainstem or cerebellum) causes is the most important clinical determination due to the markedly different implications and management.
Peripheral Vestibular Disorders
Location: Inner ear (labyrinth) or vestibular nerve
Prevalence: Account for approximately 80% of vertigo cases
Characteristics: Severe vertigo, horizontal or horizontal-torsional nystagmus that suppresses with visual fixation, often with hearing symptoms, generally benign course
Examples: Benign paroxysmal positional vertigo, vestibular neuritis, Menière disease, labyrinthitis
Central Vestibular Disorders
Location: Brainstem vestibular nuclei, cerebellum, or central vestibular pathways
Prevalence: Account for approximately 20% of vertigo cases, but higher morbidity
Characteristics: May have milder vertigo, any direction nystagmus that does not suppress with fixation, often with neurological symptoms, potentially life-threatening
Examples: Posterior circulation stroke, vestibular migraine, multiple sclerosis, cerebellar tumors
Classification by Trigger
| Pattern | Description | Suggests |
|---|---|---|
| Positional | Triggered by specific head movements (rolling over in bed, looking up, bending forward) | Benign paroxysmal positional vertigo (most common), central positional vertigo |
| Orthostatic | Triggered by standing from sitting or lying position | Orthostatic hypotension, hypovolemia, autonomic dysfunction, medication effects |
| Spontaneous episodic | Occurs without clear trigger, with symptom-free intervals | Menière disease, vestibular migraine, cardiac arrhythmias |
| Spontaneous acute prolonged | Acute onset, continuous symptoms lasting days | Vestibular neuritis, labyrinthitis, cerebellar or brainstem stroke |
| Chronic persistent | Continuous symptoms for weeks to months | Persistent postural-perceptual dizziness, bilateral vestibulopathy, chronic medical conditions |
Key Concept: The TiTrATE Approach
Modern evaluation of dizziness uses the TiTrATE framework:
- Timing — Is the symptom episodic or continuous? How long do episodes last?
- Triggers — Is the symptom spontaneous or triggered (by position, standing, stress)?
- And — What are the associated symptoms (hearing loss, headache, neurological symptoms)?
- Targeted — What does the targeted examination reveal (HINTS exam, Dix-Hallpike, orthostatic vitals)?
- Examination — Complete examination to identify the underlying syndrome
This approach replaces the older method of asking patients to choose a dizziness “type,” which has proven unreliable.
2. Pathophysiology and Mechanisms
Understanding the underlying mechanisms of dizziness and vertigo
Balance and spatial orientation depend on the precise integration of information from three sensory systems: the vestibular apparatus, vision, and proprioception. The brain continuously compares inputs from these systems to generate a coherent perception of body position and movement. Dizziness occurs when there is dysfunction, asymmetry, or conflicting information within or between these systems. Understanding the anatomy and physiology of these pathways illuminates why different conditions produce characteristic symptom patterns and guides targeted examination and treatment.
The Vestibular System: Anatomy and Function
| Structure | Location | Function | Clinical Relevance |
|---|---|---|---|
| Semicircular canals (3 pairs) | Inner ear, oriented in three perpendicular planes | Detect angular (rotational) acceleration of the head | Dysfunction causes rotational vertigo; horizontal canal most commonly affected in benign paroxysmal positional vertigo |
| Utricle | Vestibule of inner ear, horizontally oriented | Detects linear horizontal acceleration and head tilt | Source of otoconia that cause benign paroxysmal positional vertigo when displaced |
| Saccule | Vestibule of inner ear, vertically oriented | Detects linear vertical acceleration (gravity sensing) | Important for postural stability; tested by vestibular evoked myogenic potentials |
| Vestibular nerve (cranial nerve VIII) | Travels through internal auditory canal with cochlear nerve | Transmits vestibular signals to brainstem nuclei | Affected in vestibular neuritis; can be compressed by acoustic neuromas |
| Vestibular nuclei | Lateral medulla and pons | First central integration center; connects to cerebellum, oculomotor nuclei, spinal cord | Affected in brainstem strokes; critical for vestibulo-ocular reflex |
| Cerebellum (vestibulocerebellum) | Flocculonodular lobe and vermis | Calibrates and modulates vestibular responses | Cerebellar strokes can mimic peripheral vertigo; impaired gain adaptation |
The Vestibulo-Ocular Reflex: Key to Clinical Examination
The vestibulo-ocular reflex is a three-neuron arc that stabilizes gaze during head movement by producing compensatory eye movements in the opposite direction. This reflex operates at very high speed (latency less than 15 milliseconds) and is essential for clear vision during daily activities. Testing this reflex is the cornerstone of bedside vestibular examination.
| Component | Structure | Function |
|---|---|---|
| Afferent limb | Hair cells in semicircular canals → Vestibular nerve → Vestibular nuclei | Detects head rotation and transmits signal to brainstem |
| Integration center | Vestibular nuclei in medulla/pons | Processes vestibular input and coordinates output |
| Efferent limb | Projections to oculomotor nuclei (cranial nerves III, IV, VI) → Extraocular muscles | Produces compensatory eye movements opposite to head movement |
Clinical Application: The Head Impulse Test
The head impulse test directly assesses the vestibulo-ocular reflex. When the head is rapidly rotated toward a side with vestibular dysfunction, the reflex fails, and the eyes move with the head instead of remaining fixed on the target. The patient must then make a corrective saccade (quick eye movement) back to the target. A positive test (corrective saccade present) indicates peripheral vestibular loss on that side—a reassuring finding that the vertigo is not from a stroke.
Understanding Nystagmus
Nystagmus is the involuntary rhythmic oscillation of the eyes that results from vestibular asymmetry. In acute vestibular lesions, the intact side “overpowers” the damaged side, creating a perceived rotation and compensatory eye movements.
Peripheral Nystagmus
Direction: Horizontal or horizontal-torsional
Pattern: Unidirectional (fast phase away from lesion)
Fixation: Suppresses with visual fixation
Intensity: Increases when looking in direction of fast phase (Alexander’s law)
Central Nystagmus
Direction: Can be purely vertical, purely torsional, or direction-changing
Pattern: May change direction with gaze
Fixation: Does NOT suppress with fixation
Intensity: May not follow Alexander’s law
Positional Nystagmus
Direction: Upbeating and torsional in posterior canal benign paroxysmal positional vertigo
Pattern: Brief (less than 1 minute), fatigable
Latency: Onset 1-5 seconds after positioning
Red flag: Downbeating positional nystagmus suggests central cause
How Specific Conditions Cause Dizziness
| Condition | Mechanism | Treatment Implication |
|---|---|---|
| Benign paroxysmal positional vertigo | Otoconia (calcium carbonate crystals) become dislodged from utricle and enter semicircular canal, causing inappropriate cupula deflection with head movement | Canalith repositioning maneuvers (Epley, Semont) physically relocate crystals back to utricle |
| Vestibular neuritis | Viral inflammation (often herpes simplex virus reactivation) of vestibular nerve causes acute unilateral vestibular loss; creates profound asymmetry between sides | Corticosteroids may speed recovery; vestibular rehabilitation accelerates central compensation |
| Menière disease | Endolymphatic hydrops (excess fluid in endolymphatic system) causes distension and rupture of membranous labyrinth, leading to episodic vestibular and cochlear dysfunction | Salt restriction, diuretics aim to reduce endolymphatic pressure; intratympanic therapies for refractory cases |
| Vestibular migraine | Cortical spreading depression affects vestibular cortex; trigeminal activation affects inner ear blood flow; central sensitization | Migraine prophylaxis and lifestyle modification; avoid vestibular suppressants long-term |
| Posterior circulation stroke | Infarction of brainstem vestibular nuclei, cerebellum, or vestibular pathways causes acute vestibular asymmetry or bilateral dysfunction | Emergency evaluation and stroke protocol; thrombolysis if within window |
| Orthostatic hypotension | Inadequate autonomic compensation for positional blood pooling causes cerebral hypoperfusion upon standing | Identify reversible causes; volume repletion; compression garments; pharmacotherapy |
| Persistent postural-perceptual dizziness | Maladaptive central recalibration after vestibular insult; heightened visual dependence and anxiety-vestibular interaction | Vestibular rehabilitation; cognitive behavioral therapy; SSRIs/SNRIs |
Integration of Balance Systems
The brain maintains balance by weighting and integrating inputs from multiple sensory systems. When one system is compromised, increased reliance on others can lead to characteristic symptoms and examination findings.
Vestibular Input
Information: Head position and movement in space
When impaired: Vertigo, oscillopsia (visual blurring with head movement), postural instability
Compensation: Increased visual and proprioceptive dependence
Visual Input
Information: Spatial orientation relative to environment
When impaired: Increased fall risk in darkness; dizziness in visually complex environments
Over-reliance: Visual vertigo, supermarket syndrome
Proprioceptive Input
Information: Body position relative to support surface
When impaired: Unsteadiness on uneven surfaces; sensory ataxia
Common causes: Peripheral neuropathy, posterior column disease
Often Overlooked Mechanism: Cerebellar Stroke Mimicking Peripheral Vertigo
The cerebellum normally inhibits the vestibular nuclei. Cerebellar infarction can release this inhibition, producing severe vertigo that appears “peripheral” in character—intense spinning, nausea, and vomiting with relatively few other neurological findings. This is dangerous because the posterior inferior cerebellar artery territory can infarct with an isolated vertigo presentation, yet may progress to life-threatening brainstem compression from edema. The HINTS examination (Head Impulse, Nystagmus, Test of Skew) is more sensitive than early MRI for detecting posterior circulation stroke presenting as acute vestibular syndrome.
Age-Related Changes and Multisensory Dizziness
In elderly patients, dizziness frequently results from accumulated deficits across multiple balance systems rather than a single pathology. This “multisensory dizziness” or “presbyvestibulopathy” represents the convergence of age-related decline in vestibular hair cells, visual acuity, proprioception, and central processing.
| System | Age-Related Changes | Clinical Consequence |
|---|---|---|
| Vestibular | 40% reduction in vestibular hair cells and nerve fibers by age 70; decreased vestibulo-ocular reflex gain | Reduced ability to compensate for rapid head movements; oscillopsia |
| Visual | Decreased acuity, contrast sensitivity, depth perception; cataracts, macular degeneration | Increased reliance on other systems; difficulty in low-light conditions |
| Proprioceptive | Peripheral neuropathy (especially diabetic); reduced joint position sense | Unsteadiness on uneven surfaces; positive Romberg sign |
| Central processing | Slowed processing speed; white matter changes; reduced adaptive capacity | Delayed compensation after vestibular injury; cognitive load worsens balance |
3. History Taking
A comprehensive approach to eliciting the dizziness and vertigo history
Red Flags — Require Urgent Evaluation
- Acute onset with neurological symptoms — Posterior circulation stroke
- Severe headache with vertigo — Cerebellar hemorrhage, vertebral artery dissection
- Diplopia, dysarthria, dysphagia — Brainstem involvement
- New-onset ataxia or inability to walk — Central lesion, cerebellar stroke
- Neck pain with vertigo after trauma — Vertebral artery dissection
- Sudden hearing loss with vertigo — Labyrinthine infarction, requires urgent ENT referral
- Vertical or direction-changing nystagmus — Central pathology
- Syncope or near-syncope with exertion — Cardiac arrhythmia, aortic stenosis
- Chest pain or palpitations with dizziness — Cardiac cause
- Risk factors for stroke — Hypertension, diabetes, atrial fibrillation, prior stroke
Systematic History: The “SPINS” Approach
Use the mnemonic “SPINS” to ensure comprehensive history taking for dizziness and vertigo:
- S — Sensation: What exactly does the patient feel? Spinning, lightheadedness, unsteadiness, or vague dizziness?
- P — Provocation and Pattern: What triggers the symptom? Is it positional, orthostatic, spontaneous? What is the temporal pattern?
- I — Intensity and Impact: How severe is it? Can they walk? Does it affect daily activities? Associated nausea/vomiting?
- N — Neurological and otological symptoms: Any hearing loss, tinnitus, ear fullness? Headache, visual changes, weakness, numbness, speech problems?
- S — Secondary factors: Medications, medical history, cardiovascular risk factors, anxiety, recent illness?
Critical Timing Questions
The temporal pattern of dizziness is often the single most important diagnostic clue. Ask these questions systematically:
| Question | Why It Matters | Diagnostic Implications |
|---|---|---|
| “How long does each episode last?” | Duration separates major diagnostic categories | Seconds = benign paroxysmal positional vertigo, orthostasis; Minutes-hours = Menière, migraine; Days = vestibular neuritis, stroke |
| “Is it constant or does it come and go?” | Episodic versus continuous symptoms suggest different pathology | Episodic = benign paroxysmal positional vertigo, Menière, migraine; Continuous = vestibular neuritis, persistent postural-perceptual dizziness |
| “When did it first start?” | Acute versus chronic onset changes urgency | Acute first episode requires stroke exclusion; recurrent episodes suggest benign causes |
| “What were you doing when it started?” | Context provides trigger information | Rolling in bed = benign paroxysmal positional vertigo; Standing = orthostasis; Spontaneous = vestibular neuritis, Menière |
| “Are you completely normal between episodes?” | Inter-episode symptoms suggest chronic or central pathology | Complete resolution = peripheral; Persistent baseline symptoms = central or persistent postural-perceptual dizziness |
Targeted Questions by Suspected Cause
| Suspected Cause | Key Features | Ask This Question |
|---|---|---|
| Benign paroxysmal positional vertigo | Brief episodes (less than 1 minute), triggered by head position changes, intense spinning | “Does turning over in bed or looking up trigger the spinning? Does it stop within a minute if you stay still?” |
| Vestibular neuritis | Acute onset, continuous severe vertigo lasting days, often post-viral | “Did the vertigo start suddenly and remain constant? Did you have a cold or flu in the weeks before?” |
| Menière disease | Episodic vertigo (20 minutes to 12 hours), fluctuating hearing loss, tinnitus, ear fullness | “Do you notice ringing in your ear or a feeling of fullness before the spinning starts? Does your hearing seem to fluctuate?” |
| Vestibular migraine | Episodic vertigo with migraine features, variable duration, photophobia, motion sensitivity | “Do you get headaches with the dizziness? Are you sensitive to light or sound? Do you have a history of migraines?” |
| Orthostatic hypotension | Lightheadedness on standing, improves with sitting or lying | “Does the dizziness only happen when you stand up? Does it go away if you sit or lie down quickly?” |
| Cardiac arrhythmia | Presyncope or syncope, palpitations, exertional symptoms | “Do you feel your heart racing or skipping? Have you actually fainted? Does it happen with exercise?” |
| Posterior circulation stroke | Acute onset, neurological symptoms, vascular risk factors | “Did this come on suddenly? Do you have any double vision, trouble speaking, weakness, or numbness?” |
| Persistent postural-perceptual dizziness | Chronic non-spinning dizziness, worse in visually complex environments, often follows vestibular event | “Is the dizziness worse in busy places like supermarkets? Did this start after an illness or stressful event?” |
| Anxiety-related dizziness | Associated with panic symptoms, hyperventilation, situational triggers | “Do you feel anxious or panicky when the dizziness happens? Do you notice yourself breathing fast?” |
Associated Symptoms: Diagnostic Clues
Otological Symptoms (Suggest Peripheral Cause)
- Hearing loss: Menière disease, labyrinthitis, acoustic neuroma, labyrinthine infarction
- Tinnitus: Menière disease, acoustic neuroma, labyrinthitis
- Ear fullness or pressure: Menière disease, eustachian tube dysfunction
- Ear pain: Otitis media, herpes zoster oticus (Ramsay Hunt syndrome)
- Ear discharge: Chronic otitis media with labyrinthine fistula
Neurological Symptoms (Suggest Central Cause)
- Diplopia: Brainstem or cranial nerve involvement
- Dysarthria: Brainstem or cerebellar stroke
- Dysphagia: Lateral medullary syndrome
- Facial weakness or numbness: Brainstem lesion
- Limb weakness or ataxia: Stroke, multiple sclerosis
- Severe headache: Cerebellar hemorrhage, migraine
Medication and Substance History
Medications That Cause Dizziness
- Antihypertensives — Orthostatic hypotension (especially alpha-blockers, diuretics)
- Aminoglycoside antibiotics — Vestibulotoxicity (gentamicin, streptomycin)
- Loop diuretics — Ototoxicity (furosemide at high doses)
- Anticonvulsants — Cerebellar toxicity (phenytoin, carbamazepine)
- Sedatives and benzodiazepines — Central nervous system depression
- Antidepressants — Orthostasis, sedation (tricyclics, SSRIs)
- Antipsychotics — Orthostasis, sedation
- Chemotherapy agents — Vestibulotoxicity (cisplatin)
- Phosphodiesterase-5 inhibitors — Hypotension, visual changes
Social and Occupational History
- Alcohol use: Acute intoxication, cerebellar degeneration, positional alcohol nystagmus
- Caffeine: May exacerbate vestibular migraine and anxiety-related dizziness
- Smoking: Cardiovascular risk factor; may worsen Menière disease
- Occupation: Pilots, drivers, machine operators—safety implications
- Noise exposure: Occupational hearing loss, barotrauma in divers
- Recent travel: Mal de débarquement syndrome after sea travel
- Head trauma: Post-traumatic vertigo, benign paroxysmal positional vertigo
- Stress and sleep: May trigger vestibular migraine, anxiety
Relevant Past Medical History
| Condition | Relevance to Dizziness |
|---|---|
| Cardiovascular disease | Arrhythmia, orthostatic hypotension, vertebrobasilar insufficiency |
| Hypertension, diabetes, hyperlipidemia | Stroke risk factors—consider posterior circulation ischemia |
| Migraine history | Vestibular migraine even without headache during episodes |
| Anxiety or panic disorder | Psychogenic dizziness, hyperventilation; also comorbid with vestibular disorders |
| Diabetes mellitus | Peripheral neuropathy affecting proprioception; autonomic dysfunction |
| Autoimmune disease | Autoimmune inner ear disease, multiple sclerosis |
| Previous ear surgery or infection | Labyrinthine fistula, chronic vestibular dysfunction |
4. Physical Examination
A systematic approach to examining patients with dizziness and vertigo
Systematic Framework: The examination of dizzy patients has two goals: (1) identify dangerous causes requiring urgent intervention, and (2) determine the underlying mechanism to guide treatment. Use the “HINTS Plus” examination for acute vestibular syndrome and targeted examinations based on symptom pattern.
General Inspection
- Appearance: Distress level, pallor, diaphoresis (suggests vagal response or cardiac cause)
- Posture: Leaning to one side (toward vestibular lesion), reluctance to move head
- Gait observation: Can patient walk? Wide-based gait, veering to one side, ataxia
- Nystagmus at rest: Observe eyes in primary gaze before any testing
- Hearing: Does patient turn one ear toward you? Response to whispered voice
Vital Signs
| Vital Sign | What to Look For | Clinical Significance |
|---|---|---|
| Orthostatic blood pressure | Drop of ≥20 mmHg systolic or ≥10 mmHg diastolic within 3 minutes of standing | Orthostatic hypotension—identify cause (hypovolemia, medications, autonomic dysfunction) |
| Heart rate | Irregular rhythm, bradycardia, tachycardia; lack of compensatory tachycardia with orthostasis | Arrhythmia as cause; neurogenic orthostatic hypotension if heart rate does not increase with standing |
| Blood pressure (both arms) | Difference greater than 20 mmHg between arms | Subclavian steal syndrome, aortic dissection |
| Temperature | Fever | Labyrinthitis (versus vestibular neuritis), meningitis, systemic infection |
| Respiratory rate | Tachypnea, hyperventilation | Anxiety, panic disorder; respiratory alkalosis causing lightheadedness |
| Oxygen saturation | Hypoxemia | Hypoxia as cause of lightheadedness; underlying cardiopulmonary disease |
The HINTS Examination: Distinguishing Central from Peripheral Vertigo
For patients with acute vestibular syndrome (acute onset continuous vertigo with nystagmus), the HINTS examination is more sensitive than early MRI for detecting posterior circulation stroke. A “dangerous” HINTS pattern should prompt urgent neuroimaging and stroke evaluation.
HINTS Examination: When to Use
Use HINTS only for acute vestibular syndrome: acute onset, continuous vertigo, nystagmus present, and gait instability. Do NOT use for episodic or triggered vertigo (such as benign paroxysmal positional vertigo). In the correct clinical context, a “central” HINTS pattern has greater than 96% sensitivity for stroke.
| Test | Technique | Peripheral (Reassuring) | Central (Dangerous) |
|---|---|---|---|
| Head Impulse (HI) | Patient fixes gaze on examiner’s nose. Rapidly rotate head 10-20° to each side. Watch for corrective saccade. | Abnormal (positive): Corrective saccade present—vestibular nerve or labyrinth dysfunction | Normal (negative): No corrective saccade despite acute vertigo—central pathways intact but vertigo present suggests brainstem/cerebellar lesion |
| Nystagmus (N) | Observe in primary gaze and with gaze in each direction. Note direction, whether it changes with gaze direction. | Unidirectional: Fast phase beats away from lesion; increases looking toward fast phase (Alexander’s law) | Direction-changing: Changes direction with gaze direction; or purely vertical/torsional nystagmus |
| Test of Skew (TS) | Alternate cover test: cover one eye, then quickly move cover to other eye. Watch for vertical correction. | Negative: No vertical eye movement with alternate covering | Positive (skew deviation): Vertical correction when cover moved—indicates brainstem lesion |
HINTS Interpretation:
- Peripheral pattern (benign): Abnormal head impulse + Unidirectional nystagmus + Negative test of skew
- Central pattern (dangerous): ANY ONE of: Normal head impulse + Direction-changing nystagmus + Positive skew deviation
- “HINTS Plus”: Add acute hearing loss—new unilateral hearing loss with vertigo suggests labyrinthine infarction (anterior inferior cerebellar artery stroke) and requires urgent evaluation
Dix-Hallpike Test: Diagnosis of Benign Paroxysmal Positional Vertigo
The Dix-Hallpike maneuver is the gold standard for diagnosing posterior canal benign paroxysmal positional vertigo, the most common cause of vertigo.
Technique
- Patient sits on examination table, head turned 45° to one side
- Rapidly move patient to supine position with head hanging 20-30° below table level
- Maintain position for at least 30 seconds while observing eyes
- Return to sitting, observe for reversal nystagmus
- Repeat with head turned to opposite side
Positive Result (Posterior Canal)
- Latency: 1-5 second delay before nystagmus onset
- Direction: Upbeating and torsional (top of eye beats toward lower ear)
- Duration: Less than 60 seconds (typically 10-30 seconds)
- Fatigability: Decreases with repetition
- Symptoms: Reproduces patient’s typical vertigo
Red Flags in Positional Testing
The following findings suggest central positional vertigo and require neuroimaging:
- Downbeating nystagmus (suggests craniocervical junction pathology)
- No latency (immediate onset)
- Duration greater than 1 minute
- Non-fatiguing (same intensity with repetition)
- No associated vertigo despite prominent nystagmus
Additional Vestibular Examination
| Test | Technique | Interpretation |
|---|---|---|
| Supine Roll Test | Patient supine, rapidly turn head 90° to each side while watching eyes | Tests for horizontal canal benign paroxysmal positional vertigo; horizontal nystagmus beating toward ground (geotropic) or toward ceiling (apogeotropic) |
| Romberg Test | Patient stands with feet together, eyes open then closed | Increased sway with eyes closed suggests vestibular or proprioceptive dysfunction; immediate fall with eyes open suggests cerebellar disease |
| Fukuda (Unterberger) Stepping Test | Patient marches in place with eyes closed for 50 steps | Rotation greater than 45° toward one side suggests ipsilateral vestibular hypofunction |
| Dynamic Visual Acuity | Compare visual acuity with head still versus during passive horizontal head oscillation | Drop of more than 2 lines suggests bilateral vestibular hypofunction |
| Head Shaking Nystagmus | Patient closes eyes, examiner oscillates head horizontally for 20 seconds, then observes for nystagmus | Nystagmus appearing after head shaking suggests asymmetric vestibular function |
| Frenzel Goggles | Magnifying lenses that eliminate visual fixation | Enhances detection of peripheral nystagmus (which suppresses with fixation); central nystagmus persists |
Ear Examination
Otoscopy
- External canal: Cerumen impaction, foreign body, vesicles (herpes zoster oticus)
- Tympanic membrane: Perforation, cholesteatoma, middle ear effusion, hemotympanum
- Pneumatic otoscopy: Vertigo and nystagmus with pressure changes suggests labyrinthine fistula or superior canal dehiscence
Hearing Assessment
- Whispered voice test: Gross assessment of hearing asymmetry
- Weber test: Tuning fork on forehead—lateralizes to affected ear in conductive loss, away in sensorineural loss
- Rinne test: Air versus bone conduction—air greater than bone is normal; bone greater than air suggests conductive loss
- Finger rub test: Compare hearing in each ear
Neurological Examination
| System | Tests | Significance |
|---|---|---|
| Cranial nerves | Pupils, extraocular movements, facial sensation and strength, palate elevation, tongue movement | Multiple cranial nerve deficits suggest brainstem lesion |
| Motor | Strength in all limbs, pronator drift | Unilateral weakness suggests stroke |
| Sensory | Light touch, proprioception (especially lower limbs) | Peripheral neuropathy contributing to imbalance |
| Cerebellar | Finger-nose-finger, heel-shin, rapid alternating movements, gait | Dysmetria, dysdiadochokinesia, ataxic gait suggest cerebellar lesion |
| Gait | Observe walking, tandem gait, turning | Wide-based ataxic gait (cerebellar); veering to one side (peripheral vestibular); small shuffling steps (parkinsonian) |
Cardiovascular Examination
- Heart auscultation: Murmurs (aortic stenosis causes exertional syncope), irregular rhythm
- Carotid auscultation: Bruits suggesting carotid stenosis
- Jugular venous pressure: Elevated in heart failure
- Peripheral pulses: Asymmetry suggesting vascular disease
- Peripheral edema: Heart failure, venous insufficiency
Expected Findings by Etiology
| Condition | Vestibular Examination | Neurological Examination | Other Findings |
|---|---|---|---|
| Benign paroxysmal positional vertigo | Positive Dix-Hallpike with characteristic nystagmus | Normal | Normal hearing, no spontaneous nystagmus |
| Vestibular neuritis | Abnormal head impulse toward affected side; unidirectional horizontal-torsional nystagmus | Normal | Normal hearing; “safe” HINTS pattern |
| Menière disease | May have nystagmus during attack; between attacks often normal | Normal | Unilateral low-frequency hearing loss; may have positive Romberg |
| Cerebellar stroke | Normal head impulse; direction-changing or vertical nystagmus; positive skew | Cerebellar signs: dysmetria, ataxia, dysdiadochokinesia | “Dangerous” HINTS pattern; unable to walk |
| Brainstem stroke | “Dangerous” HINTS pattern | Cranial nerve deficits, crossed sensory/motor findings | May have Horner syndrome, dysphagia, dysarthria |
| Orthostatic hypotension | Normal vestibular examination | Usually normal; may have signs of autonomic neuropathy | Positive orthostatic vital signs; reproduction of symptoms with standing |
| Anxiety-related dizziness | Normal vestibular examination | Normal | Hyperventilation may reproduce symptoms; normal exam overall |
Important Teaching Point
A normal general neurological examination does NOT exclude stroke! Up to 50% of patients with posterior circulation strokes have isolated vertigo without other neurological findings on standard examination. This is why the HINTS examination is critical—it detects central pathology that standard neurological examination misses. Conversely, many common causes of dizziness (vestibular migraine, persistent postural-perceptual dizziness, anxiety) present with entirely normal physical examination findings.
5. Differential Diagnosis
Systematic approach organized by timing pattern, probability, and clinical features
The differential diagnosis of dizziness is best organized by the temporal pattern of symptoms rather than by attempting to categorize the sensation type. This approach, based on the TiTrATE framework, guides efficient evaluation and reduces diagnostic error.
Acute Vestibular Syndrome (Continuous Vertigo Lasting Days)
Acute vestibular syndrome presents with sudden-onset continuous vertigo, nausea/vomiting, gait instability, nystagmus, and head motion intolerance lasting days to weeks. The critical distinction is between peripheral and central causes.
| Probability | Condition | Key Features | Red Flags |
|---|---|---|---|
| COMMON (approximately 70-80%) | Vestibular neuritis | Acute onset, severe vertigo for days, often post-viral; unilateral vestibular loss on examination | — |
| COMMON | Labyrinthitis | Same as vestibular neuritis PLUS hearing loss and/or tinnitus | Sudden profound hearing loss requires urgent ENT referral |
| LESS COMMON (approximately 15-20%) | Posterior circulation stroke (cerebellar or brainstem) | Vascular risk factors; “dangerous” HINTS pattern; may have subtle neurological signs | Normal head impulse test; direction-changing nystagmus; skew deviation; inability to walk |
| LESS COMMON | Multiple sclerosis (acute demyelinating lesion) | Young patient; may have prior neurological episodes; central pattern on examination | Other neurological symptoms; history of optic neuritis |
| UNCOMMON BUT SERIOUS (approximately 5%) | Labyrinthine infarction (anterior inferior cerebellar artery) | Acute vertigo WITH sudden hearing loss; may be isolated or with cerebellar signs | HINTS Plus: new hearing loss with acute vertigo = stroke until proven otherwise |
| UNCOMMON BUT SERIOUS | Cerebellar hemorrhage | Severe headache, vomiting, rapid deterioration; hypertension | Severe headache; decreased consciousness; hypertensive emergency |
| UNCOMMON BUT SERIOUS | Wernicke encephalopathy | Alcoholism or malnutrition; confusion, ataxia, ophthalmoplegia | Altered mental status; history of alcohol use disorder |
Episodic Triggered Vestibular Syndrome (Brief Episodes with Specific Triggers)
Key Diagnostic Question: What triggers the episodes?
- Head position changes → Benign paroxysmal positional vertigo
- Standing from sitting/lying → Orthostatic hypotension
- Loud sounds or pressure changes → Superior canal dehiscence, perilymph fistula
- Valsalva maneuver → Superior canal dehiscence
| Probability | Condition | Duration | Key Features |
|---|---|---|---|
| VERY COMMON (approximately 50%) | Benign paroxysmal positional vertigo | Seconds to less than 1 minute | Triggered by rolling over, looking up, bending; positive Dix-Hallpike; fatigable |
| COMMON (approximately 30%) | Orthostatic hypotension | Seconds to minutes | On standing; improves with sitting/lying; positive orthostatic vitals |
| LESS COMMON | Cardiac arrhythmia | Seconds to minutes | Presyncope or syncope; palpitations; exertional symptoms |
| LESS COMMON | Superior semicircular canal dehiscence | Seconds | Triggered by loud sounds (Tullio phenomenon) or pressure changes; autophony; pulsatile tinnitus |
| UNCOMMON | Perilymph fistula | Variable | History of barotrauma, surgery, or trauma; vertigo with pressure changes |
| UNCOMMON | Central positional vertigo | Variable, often prolonged | Atypical nystagmus on Dix-Hallpike (downbeating, non-fatiguing); posterior fossa lesion |
Episodic Spontaneous Vestibular Syndrome (Recurrent Episodes Without Clear Trigger)
| Probability | Condition | Episode Duration | Distinguishing Features |
|---|---|---|---|
| COMMON (approximately 40%) | Vestibular migraine | Minutes to 72 hours | Migraine history or features; photophobia, phonophobia; motion sensitivity; may occur without headache |
| COMMON (approximately 30%) | Menière disease | 20 minutes to 12 hours | Fluctuating hearing loss, tinnitus, aural fullness; episodes cluster then remit |
| LESS COMMON | Transient ischemic attack (posterior circulation) | Minutes (typically less than 1 hour) | Vascular risk factors; usually other brainstem/cerebellar symptoms; single episode more concerning |
| LESS COMMON | Panic disorder with dizziness | Minutes to 1 hour | Associated panic symptoms; situational triggers; hyperventilation |
| UNCOMMON | Vestibular paroxysmia | Seconds to minutes (brief, frequent) | Very brief attacks, many per day; responds to carbamazepine; vascular compression of CN VIII |
| UNCOMMON | Autoimmune inner ear disease | Hours to days | Bilateral fluctuating hearing loss; may have systemic autoimmune disease |
| UNCOMMON | Episodic ataxia type 2 | Hours | Family history; triggered by stress or exercise; interictal nystagmus; responds to acetazolamide |
Chronic Vestibular Syndrome (Persistent Dizziness Greater Than 3 Months)
Step-by-Step Approach to Chronic Dizziness:
- Step 1: Review medications — Many drugs cause chronic dizziness
- Step 2: Identify comorbidities — Anxiety, migraine, prior vestibular disorder
- Step 3: Consider persistent postural-perceptual dizziness — Most common cause of chronic non-spinning dizziness
- Step 4: Evaluate for bilateral vestibulopathy — Especially if oscillopsia and ototoxin exposure
- Step 5: Assess for multisensory dizziness in elderly — Cumulative deficits
| Probability | Condition | Approximate Frequency | Key Distinguishing Features |
|---|---|---|---|
| COMMON | Persistent postural-perceptual dizziness | 25-30% | Non-spinning dizziness; worse with upright posture, active/passive motion, complex visual stimuli; often follows vestibular event |
| COMMON | Chronic subjective dizziness with anxiety | 20-25% | Prominent anxiety; avoidance behaviors; phobic component; hypervigilance to symptoms |
| COMMON | Medication-induced dizziness | 15-20% | Temporal relationship to medication; polypharmacy; antihypertensives, sedatives common culprits |
| COMMON | Multisensory dizziness of aging (presbyvestibulopathy) | 15-20% | Elderly patient; multiple sensory deficits; worse in darkness, uneven surfaces; gait impairment |
| LESS COMMON | Uncompensated peripheral vestibular loss | 5-10% | Prior vestibular neuritis or surgery; persistent imbalance; positive head impulse |
| LESS COMMON | Bilateral vestibulopathy | 5% | Oscillopsia (visual blurring with head movement); unsteadiness in dark; bilateral abnormal head impulse; ototoxin history |
| UNCOMMON | Vestibular schwannoma (acoustic neuroma) | less than 1% | Progressive unilateral hearing loss and tinnitus; imbalance; facial numbness |
| UNCOMMON | Cerebellar degeneration | less than 1% | Progressive ataxia; alcohol history; paraneoplastic; genetic |
| UNCOMMON | Chiari malformation | less than 1% | Headache with Valsalva; downbeat nystagmus; posterior fossa crowding on imaging |
Anatomical Approach to Dizziness
Peripheral Vestibular (Inner Ear)
Benign paroxysmal positional vertigo
Vestibular neuritis
Labyrinthitis
Menière disease
Superior canal dehiscence
Vestibular schwannoma
Central Vestibular (Brainstem/Cerebellum)
Posterior circulation stroke
Multiple sclerosis
Cerebellar degeneration
Vestibular migraine (central component)
Chiari malformation
Posterior fossa tumor
Cardiovascular
Orthostatic hypotension
Cardiac arrhythmias
Vasovagal syncope
Aortic stenosis
Carotid sinus hypersensitivity
Subclavian steal syndrome
Systemic/Psychiatric
Persistent postural-perceptual dizziness
Anxiety and panic disorder
Medication effects
Anemia
Hypoglycemia
Peripheral neuropathy
Drug-Induced Dizziness
| Drug or Drug Class | Mechanism | Characteristics | Management |
|---|---|---|---|
| Aminoglycoside antibiotics | Vestibulotoxicity—hair cell destruction in semicircular canals | Bilateral vestibulopathy; oscillopsia; permanent | Prevention with monitoring; vestibular rehabilitation |
| Antihypertensives (especially alpha-blockers, diuretics) | Orthostatic hypotension | Lightheadedness on standing; dose-related | Dose adjustment; timing changes; alternative agents |
| Anticonvulsants (phenytoin, carbamazepine) | Cerebellar toxicity at high levels | Ataxia, nystagmus, dysarthria; dose-related | Check drug levels; dose reduction |
| Benzodiazepines and sedative-hypnotics | Central nervous system depression; impaired vestibular compensation | Generalized dizziness, unsteadiness | Gradual taper; avoid in chronic dizziness |
| Antidepressants (tricyclics, SSRIs) | Orthostatic hypotension; serotonin effects | Lightheadedness, especially on initiation | Slow titration; consider alternatives |
| Opioids | Central nervous system depression; vestibular effects | Lightheadedness, nausea, unsteadiness | Dose reduction; consider rotation |
| Cisplatin and other chemotherapeutics | Ototoxicity affecting vestibular and cochlear function | Bilateral vestibulopathy and hearing loss; permanent | Monitoring during treatment; supportive care |
| Loop diuretics (high-dose furosemide) | Ototoxicity, especially with aminoglycosides | May be reversible if caught early | Avoid combination with aminoglycosides; monitoring |
| Salicylates (aspirin toxicity) | Cochlear and vestibular toxicity at high doses | Tinnitus, hearing loss, dizziness; reversible | Dose reduction or discontinuation |
Quick Reference: “If You See This, Think This”
| Clinical Clue | Think This First | Next Step |
|---|---|---|
| Brief vertigo with rolling over in bed | Benign paroxysmal positional vertigo | Dix-Hallpike test; Epley maneuver if positive |
| Acute continuous vertigo with “safe” HINTS | Vestibular neuritis | Symptom management; consider steroids; vestibular rehabilitation |
| Acute vertigo with normal head impulse test | Central lesion (stroke until proven otherwise) | Urgent MRI; stroke protocol |
| Episodic vertigo with hearing loss, tinnitus, ear fullness | Menière disease | Audiometry; salt restriction; referral to ENT |
| Episodic vertigo with migraine features | Vestibular migraine | Migraine treatment trial; lifestyle modification |
| Lightheadedness only on standing | Orthostatic hypotension | Orthostatic vitals; medication review; hydration |
| Chronic dizziness worse in busy visual environments | Persistent postural-perceptual dizziness | Vestibular rehabilitation; consider SSRI; cognitive behavioral therapy |
| Unilateral progressive hearing loss with imbalance | Vestibular schwannoma | MRI internal auditory canals with contrast |
| Oscillopsia with head movement, bilateral abnormal head impulse | Bilateral vestibulopathy | Review for ototoxins; vestibular rehabilitation |
| Dizziness with palpitations or near-syncope | Cardiac arrhythmia | ECG; Holter monitor; cardiology referral |
6. Diagnostic Investigations
A stepwise, cost-effective approach guided by clinical syndrome
Investigation of dizziness should be guided by the clinical syndrome identified through history and examination. Most patients with dizziness do not require extensive testing—clinical diagnosis is sufficient for conditions like benign paroxysmal positional vertigo. Reserve advanced testing for atypical presentations, red flag features, or when the diagnosis remains uncertain after initial evaluation.
When Extensive Testing Is NOT Needed
- Classic benign paroxysmal positional vertigo: Positive Dix-Hallpike with typical features—treat with repositioning
- Typical vestibular neuritis: “Safe” HINTS pattern with clear post-viral onset—supportive care
- Clear orthostatic hypotension: Positive orthostatic vitals reproducing symptoms—investigate cause
- Obvious medication-induced dizziness: Clear temporal relationship—adjust medications
Baseline Investigations for Undifferentiated Dizziness
| Investigation | Purpose | What to Look For | Practical Points |
|---|---|---|---|
| Complete blood count | Screen for anemia, infection | Hemoglobin less than 10 g/dL may cause lightheadedness; elevated white blood cells in infection | Simple, widely available; low yield if no clinical suspicion |
| Basic metabolic panel | Identify metabolic causes | Hyponatremia, hypoglycemia, uremia, dehydration | Useful in elderly, diabetics, those on diuretics |
| Glucose (fasting or random) | Hypoglycemia screen | Glucose less than 70 mg/dL may cause lightheadedness | Check in diabetics, symptoms with fasting |
| Thyroid function tests | Thyroid dysfunction | Hypothyroidism causes fatigue and dizziness; hyperthyroidism causes palpitations | Consider in chronic dizziness without clear cause |
| ECG (12-lead) | Cardiac arrhythmia screen | Arrhythmia, heart block, prolonged QT, pre-excitation, ischemia | Essential if presyncope, palpitations, or cardiac risk factors |
| Orthostatic vital signs | Confirm orthostatic hypotension | Drop of ≥20 mmHg systolic or ≥10 mmHg diastolic within 3 minutes of standing | Must be done properly: supine for 5 minutes, then standing with measurements at 1 and 3 minutes |
Targeted Investigations by Clinical Syndrome
If Suspecting Acute Vestibular Syndrome with Central Features
Urgent Investigations
- MRI brain with diffusion-weighted imaging: Gold standard for posterior circulation stroke; note that early MRI (less than 48 hours) may miss up to 20% of small strokes
- MR angiography or CT angiography (head and neck): Evaluate vertebrobasilar vessels for dissection, stenosis, occlusion
- CT head (non-contrast): If MRI unavailable or contraindicated; rules out hemorrhage but poor for ischemic stroke
Additional Investigations
- Echocardiogram: If cardioembolic source suspected
- Holter monitor or event recorder: If paroxysmal atrial fibrillation suspected
- Hypercoagulability workup: In young patients without traditional risk factors
- Lumbar puncture: If multiple sclerosis or meningitis suspected
Critical Point: MRI Timing in Stroke
MRI with diffusion-weighted imaging can be falsely negative in up to 20% of posterior circulation strokes within the first 48 hours. If clinical suspicion is high (dangerous HINTS pattern, stroke risk factors) but initial MRI is negative, consider repeat imaging in 3-7 days or admission for observation and vascular workup.
If Suspecting Menière Disease
First-Line Tests
- Pure tone audiometry: Low-frequency sensorineural hearing loss (250-1000 Hz); fluctuates between attacks
- Speech discrimination testing: May be disproportionately poor relative to pure tone thresholds
- Tympanometry: Rule out middle ear pathology
Second-Line Tests
- MRI internal auditory canals with gadolinium: Exclude vestibular schwannoma (required in unilateral symptoms)
- Electrocochleography: Elevated summating potential to action potential ratio suggests endolymphatic hydrops
- Vestibular evoked myogenic potentials: May show reduced amplitudes
If Suspecting Vestibular Migraine
First-Line Tests
- Audiometry: Usually normal; rules out Menière disease
- Clinical diagnosis: Based on Bárány Society/International Headache Society criteria—no definitive test exists
Second-Line Tests
- MRI brain: If atypical features, first presentation, or neurological findings—rule out structural lesion
- Vestibular function testing: May show non-specific abnormalities; not diagnostic
If Suspecting Cardiac Cause
First-Line Tests
- 12-lead ECG: Arrhythmia, conduction abnormalities, ischemia, long QT
- Holter monitor (24-48 hours): If paroxysmal arrhythmia suspected and symptoms occur daily
- Event recorder (2-4 weeks): For infrequent symptoms
Second-Line Tests
- Echocardiogram: Structural heart disease, aortic stenosis, cardiomyopathy
- Implantable loop recorder: If symptoms infrequent and high suspicion for arrhythmia
- Tilt table testing: For suspected vasovagal syncope or orthostatic intolerance
- Electrophysiology study: If arrhythmia strongly suspected but not captured
If Suspecting Vestibular Schwannoma (Acoustic Neuroma)
First-Line Tests
- Pure tone audiometry: Asymmetric sensorineural hearing loss (high frequency); poor speech discrimination
- MRI internal auditory canals with gadolinium: Definitive test; demonstrates enhancing mass in cerebellopontine angle or internal auditory canal
When to Order MRI
- Asymmetric sensorineural hearing loss (difference of more than 15 dB at any frequency)
- Unilateral tinnitus
- Progressive unilateral hearing loss
- Unilateral vestibular symptoms with hearing changes
Specialized Vestibular Function Testing
These tests are typically ordered by specialists (neurology, ENT, neuro-otology) for complex or refractory cases.
| Test | What It Measures | When to Order | Interpretation |
|---|---|---|---|
| Videonystagmography / Electronystagmography | Eye movements; caloric response of horizontal canals | Unilateral vestibular loss suspected; unexplained chronic dizziness | Unilateral weakness greater than 25% suggests peripheral vestibular hypofunction on that side |
| Video head impulse test | Vestibulo-ocular reflex function for all 6 semicircular canals | Quantify vestibular loss; identify specific canal involvement | Reduced gain (less than 0.8) indicates canal dysfunction; presence of covert/overt saccades |
| Vestibular evoked myogenic potentials (ocular and cervical) | Otolith organ (utricle, saccule) function | Superior canal dehiscence (low thresholds); Menière disease; vestibular neuritis | Absent responses suggest otolith dysfunction; low thresholds suggest superior canal dehiscence |
| Rotary chair testing | Vestibulo-ocular reflex at various frequencies | Bilateral vestibular loss; compensation assessment | Reduced gain with phase lead suggests bilateral vestibular hypofunction |
| Posturography (computerized dynamic) | Balance using vestibular, visual, and somatosensory inputs | Functional assessment; unexplained falls; rehabilitation planning | Identifies which sensory system is impaired; may detect non-physiologic patterns |
| High-resolution CT temporal bones | Bony anatomy of inner ear | Superior canal dehiscence; cholesteatoma; post-traumatic evaluation | Identifies bony defects, erosion, or abnormalities |
Empiric Treatment Trials as Diagnostic Tools
When Diagnosis Remains Uncertain
In some cases, particularly for vestibular migraine and persistent postural-perceptual dizziness, diagnosis is clinical and no definitive test exists. Empiric treatment trials can serve dual diagnostic and therapeutic purposes.
- Migraine prophylaxis trial: If vestibular migraine suspected—try topiramate, propranolol, amitriptyline, or venlafaxine for 2-3 months. Significant improvement supports diagnosis.
- SSRI/SNRI trial: If persistent postural-perceptual dizziness suspected—sertraline or venlafaxine at low doses, gradual uptitration over 8-12 weeks. Response supports diagnosis.
- Vestibular rehabilitation: Both diagnostic and therapeutic—improvement supports vestibular etiology and promotes compensation.
- Medication simplification: If polypharmacy present—systematic reduction of vestibulotoxic or dizziness-causing medications to identify culprit.
Investigation Algorithm by Clinical Syndrome
| Clinical Syndrome | Minimum Workup | Additional Testing If Indicated |
|---|---|---|
| Benign paroxysmal positional vertigo (classic) | None—clinical diagnosis | Imaging only if atypical features or treatment failure |
| Vestibular neuritis (safe HINTS) | None—clinical diagnosis | MRI if atypical features or failure to improve |
| Acute vestibular syndrome with red flags | Urgent MRI brain with diffusion-weighted imaging; vascular imaging | Stroke workup; cardiac evaluation |
| Recurrent vertigo with hearing symptoms | Audiometry; MRI internal auditory canals | Vestibular function tests; electrocochleography |
| Recurrent vertigo with migraine features | Audiometry (to exclude Menière); consider MRI brain | Vestibular function tests if diagnosis uncertain |
| Presyncope or syncope | Orthostatic vitals; ECG; basic labs | Holter/event monitor; echocardiogram; tilt table |
| Chronic non-specific dizziness | Basic labs; medication review; audiometry | Vestibular function tests; MRI if focal findings; psychiatric evaluation |
7. Pattern Recognition and Clinical Decision-Making
Practical algorithms and decision pathways for dizziness and vertigo
Step 1: Is This Urgent?
The first priority is identifying patients who require emergent evaluation. Use this triage framework to determine urgency.
| Clinical Scenario | Urgency Level | Immediate Action |
|---|---|---|
| Acute vertigo with “dangerous” HINTS pattern (normal head impulse, direction-changing nystagmus, or skew deviation) | EMERGENT | Activate stroke protocol; urgent MRI and vascular imaging; neurology consultation |
| Acute vertigo with new neurological deficits (diplopia, dysarthria, dysphagia, weakness, ataxia) | EMERGENT | Stroke protocol; CT head immediately if MRI not available; admit for observation |
| Acute vertigo with sudden hearing loss | EMERGENT | HINTS Plus positive = assume stroke; also urgent ENT for possible steroid therapy for sudden sensorineural hearing loss |
| Severe headache with vertigo (especially with hypertension) | EMERGENT | CT head to exclude cerebellar hemorrhage; blood pressure management |
| Syncope or near-syncope with exertion | EMERGENT | ECG immediately; consider aortic stenosis, arrhythmia, hypertrophic cardiomyopathy |
| Acute vertigo with neck pain after trauma or manipulation | EMERGENT | Vertebral artery dissection until proven otherwise; CT angiography neck; immobilization |
| Acute continuous vertigo with “safe” HINTS pattern | URGENT | Likely vestibular neuritis; symptom management; consider steroids; arrange follow-up |
| New episodic vertigo with vascular risk factors | URGENT | Outpatient workup within days; consider posterior circulation TIA; vascular imaging |
| Recurrent positional vertigo, typical history | ROUTINE | Dix-Hallpike in office; treat with repositioning maneuver if positive |
| Chronic dizziness without red flags | ROUTINE | Systematic outpatient evaluation; medication review; consider referral |
Step 2: Classify by Timing and Trigger
Once urgency is established, classify the dizziness syndrome to guide the diagnostic pathway.
Acute Continuous (Days)
Pattern: Sudden onset, constant symptoms
Key question: Peripheral or central?
→ Proceed to HINTS Examination Algorithm
Episodic Triggered
Pattern: Brief episodes with specific triggers
Key question: What is the trigger?
→ Proceed to Triggered Vertigo Algorithm
Episodic Spontaneous
Pattern: Recurrent episodes without clear trigger
Key question: Hearing symptoms? Migraine features?
→ Proceed to Recurrent Vertigo Algorithm
Chronic Persistent (Greater Than 3 Months)
Pattern: Continuous symptoms for weeks to months
Key question: Spinning or non-spinning? Worse with visual motion?
→ Proceed to Chronic Dizziness Algorithm
Presyncope Pattern
Pattern: Feeling of impending faint, lightheadedness
Key question: Orthostatic? Cardiac symptoms?
→ Proceed to Presyncope Algorithm
Step 3: Follow the Appropriate Algorithm
Algorithm A: Acute Vestibular Syndrome (HINTS-Based)
| HINTS Finding | Interpretation | Action |
|---|---|---|
| Abnormal head impulse + Unidirectional nystagmus + Negative skew | PERIPHERAL (Safe) — Vestibular neuritis likely | Symptomatic treatment; consider prednisone 1 mg/kg for 5-10 days; vestibular rehabilitation referral; follow-up in 1-2 weeks |
| Normal head impulse (despite acute vertigo) | CENTRAL (Dangerous) — Stroke until proven otherwise | Urgent MRI with diffusion-weighted imaging; stroke protocol; admit for observation |
| Direction-changing nystagmus | CENTRAL (Dangerous) — Brainstem or cerebellar lesion | Urgent MRI; neurology consultation; stroke protocol |
| Skew deviation present | CENTRAL (Dangerous) — Brainstem lesion | Urgent MRI; stroke protocol |
| Any HINTS component + acute hearing loss | HINTS Plus positive — Labyrinthine infarction (anterior inferior cerebellar artery territory) | Urgent MRI and vascular imaging; ENT for sudden hearing loss protocol |
Algorithm B: Episodic Triggered Vertigo
| Trigger | Duration | Most Likely Diagnosis | Action |
|---|---|---|---|
| Rolling over in bed, looking up, bending forward | Less than 1 minute | Benign paroxysmal positional vertigo | Dix-Hallpike test; if positive, perform Epley maneuver |
| Standing from sitting or lying | Seconds to minutes; resolves with sitting | Orthostatic hypotension | Orthostatic vital signs; medication review; hydration; investigate cause |
| Loud sounds (Tullio phenomenon) | Seconds | Superior semicircular canal dehiscence | High-resolution CT temporal bones; vestibular evoked myogenic potentials |
| Pressure changes (coughing, straining, nose blowing) | Seconds | Superior canal dehiscence or perilymph fistula | CT temporal bones; ENT referral |
| Head position change with atypical nystagmus | Greater than 1 minute or non-fatiguing | Central positional vertigo | MRI brain with attention to posterior fossa |
Algorithm C: Episodic Spontaneous Vertigo
| Key Features | Episode Duration | Most Likely Diagnosis | Action |
|---|---|---|---|
| Fluctuating hearing loss, tinnitus, ear fullness | 20 minutes to 12 hours | Menière disease | Audiometry; MRI to exclude schwannoma; salt restriction; diuretic trial; ENT referral |
| Migraine history or features; photophobia, phonophobia | 5 minutes to 72 hours | Vestibular migraine | Rule out Menière (audiometry); lifestyle modification; migraine prophylaxis trial |
| Vascular risk factors; first episode; brief | Minutes to less than 1 hour | Posterior circulation transient ischemic attack | Urgent vascular imaging; stroke risk stratification; secondary prevention |
| Palpitations, presyncope, exertional symptoms | Variable | Cardiac arrhythmia | ECG; Holter or event monitor; cardiology referral |
| Panic symptoms, hyperventilation, situational | Minutes | Panic disorder | Psychiatric evaluation; cognitive behavioral therapy; consider SSRI |
Algorithm D: Chronic Persistent Dizziness
| Key Features | Most Likely Diagnosis | Action |
|---|---|---|
| Non-spinning dizziness; worse with upright posture, motion, busy visual environments; often follows vestibular event | Persistent postural-perceptual dizziness | Vestibular rehabilitation; SSRI or SNRI; cognitive behavioral therapy |
| Oscillopsia with head movement; bilateral abnormal head impulse; history of ototoxin exposure | Bilateral vestibulopathy | Identify and remove ototoxins; vestibular rehabilitation (critical); fall prevention |
| Elderly patient; multiple sensory deficits; worse in dark or on uneven surfaces | Multisensory dizziness of aging | Optimize vision and hearing; treat neuropathy; physical therapy for balance; home safety evaluation |
| Clear temporal relationship to medication; polypharmacy | Medication-induced dizziness | Systematic medication reduction; substitute alternatives; reassess |
| Progressive unilateral hearing loss; tinnitus; imbalance | Vestibular schwannoma | MRI internal auditory canals with gadolinium; neurosurgery or radiation oncology referral |
“What Do I Do If…” Decision Reference
| Clinical Situation | Immediate Action | Next Step |
|---|---|---|
| Patient cannot walk due to vertigo | Perform HINTS examination; if any central sign, activate stroke protocol | If peripheral pattern, may still need admission for symptom management and hydration |
| Dix-Hallpike is positive | Perform Epley repositioning maneuver immediately | Provide home Brandt-Daroff exercises; follow-up if no improvement in 1-2 weeks |
| Dix-Hallpike shows downbeating nystagmus | Do NOT perform Epley—this suggests central positional vertigo | Order MRI brain with posterior fossa views; neurology referral |
| HINTS is “safe” but patient has stroke risk factors | Trust the HINTS if properly performed—more sensitive than early MRI | Consider 24-48 hour observation; repeat MRI if clinical concern persists |
| Patient has recurrent vertigo but normal between episodes | Detailed history for timing and associated symptoms | Audiometry for all; consider vestibular migraine versus Menière based on features |
| Elderly patient with chronic imbalance and multiple comorbidities | Comprehensive medication review; assess vision, hearing, proprioception | Multidisciplinary approach: physical therapy, occupational therapy, home safety; fall prevention program |
| Patient requests meclizine for chronic dizziness | Explain that vestibular suppressants impair central compensation | Limit use to acute episodes only (less than 3 days); refer for vestibular rehabilitation |
| Benign paroxysmal positional vertigo keeps recurring | Confirm diagnosis with Dix-Hallpike; repeat repositioning | Check vitamin D level; consider underlying vestibular disorder; ENT referral if frequent recurrence |
Troubleshooting Refractory Dizziness
When Dizziness Does Not Improve, Ask These Questions
- Is the diagnosis correct? Reassess history and examination; consider alternative diagnoses
- Are there multiple overlapping causes? Migraine AND benign paroxysmal positional vertigo; anxiety AND vestibular disorder; medication effect AND peripheral vestibular loss
- Is the patient on vestibular suppressants long-term? These impair compensation—taper and discontinue
- Has vestibular rehabilitation been tried? Most effective treatment for many chronic vestibular disorders
- Is there untreated anxiety or depression? Common comorbidity that perpetuates symptoms
- Are medications contributing? Review all medications, including over-the-counter
- Has posterior fossa imaging been done? MRI to exclude schwannoma, Chiari, demyelination
- Is specialist referral indicated? Neuro-otology, neurology, or ENT for complex cases
8. Clinical Pearls and Pitfalls
Practical wisdom — learn from successes and avoid common mistakes
Must-Know Clinical Pearls
HINTS beats MRI: In acute vestibular syndrome, a properly performed HINTS examination by a trained clinician is more sensitive than MRI within the first 48 hours for detecting posterior circulation stroke.
Timing trumps type: The temporal pattern of dizziness (episodic versus continuous, triggered versus spontaneous, duration) is more diagnostically useful than asking patients to categorize their sensation as “spinning” versus “lightheaded.”
Benign paroxysmal positional vertigo is the most common cause of vertigo: Always perform Dix-Hallpike in patients with positional symptoms—it is diagnostic and the treatment (Epley maneuver) can be done immediately with high success rates.
The “normal” head impulse in acute vertigo is dangerous: A normal head impulse test in a patient with acute continuous vertigo suggests the vestibulo-ocular reflex is intact but vertigo is present—this points to a central (brainstem or cerebellar) lesion.
Vestibular migraine is underdiagnosed: It is the second most common cause of recurrent vertigo after benign paroxysmal positional vertigo. Vertigo can occur without headache, and many patients have a remote migraine history they do not mention.
Sudden hearing loss with vertigo is an emergency: This combination (HINTS Plus) suggests labyrinthine infarction from anterior inferior cerebellar artery occlusion. It also requires urgent ENT evaluation for possible steroid treatment of sudden sensorineural hearing loss.
Vestibular rehabilitation works: For most chronic vestibular disorders, vestibular rehabilitation therapy is the most effective treatment—more effective than medication. Refer early and encourage adherence.
Multiple causes are common in the elderly: Do not stop looking after finding one abnormality. Elderly patients often have benign paroxysmal positional vertigo AND orthostatic hypotension AND medication effects AND peripheral neuropathy contributing to their symptoms.
Critical Pitfalls to Avoid
Relying on symptom type alone: Patients inconsistently describe their dizziness, and the same patient may describe “spinning” at one visit and “lightheadedness” at another. Use timing and triggers, not just sensation quality.
Assuming all positional vertigo is benign paroxysmal positional vertigo: Central positional vertigo (from posterior fossa lesions) can mimic it. Red flags include downbeating nystagmus, no latency, duration greater than 1 minute, and non-fatigability. Always assess nystagmus characteristics.
Trusting a negative MRI in acute vestibular syndrome: Up to 20% of posterior circulation strokes are missed on MRI within 48 hours. Clinical examination (HINTS) is more sensitive. If suspicion is high, repeat imaging or admit for observation.
Prescribing long-term vestibular suppressants: Meclizine, diazepam, and similar medications impair central compensation and perpetuate chronic dizziness. Limit use to the acute phase (less than 3 days) only.
Missing medication-induced dizziness: Always review the medication list. Antihypertensives, sedatives, anticonvulsants, and many other drugs cause dizziness. This is especially common in elderly patients on polypharmacy.
Performing HINTS in the wrong clinical context: HINTS is validated only for acute vestibular syndrome (acute continuous vertigo with nystagmus). Using it for episodic vertigo or chronic dizziness leads to misinterpretation.
Attributing vertigo to “cervical spondylosis” or “vertebrobasilar insufficiency”: True cervicogenic dizziness is rare and overdiagnosed. Vertebrobasilar insufficiency causing isolated recurrent vertigo is uncommon—most such presentations are vestibular migraine or other vestibular disorders.
Dismissing dizziness as “anxiety” without thorough evaluation: While anxiety commonly accompanies vestibular disorders, it is rarely the sole cause. Most patients labeled with “psychogenic dizziness” have an underlying vestibular problem. Anxiety and vestibular disorders frequently coexist and reinforce each other.
Key Takeaways
- Classify dizziness by timing and triggers (TiTrATE approach) rather than asking patients to choose a symptom type—this is more reliable and diagnostically useful.
- For acute vestibular syndrome, the HINTS examination (Head Impulse, Nystagmus, Test of Skew) distinguishes peripheral from central causes with greater sensitivity than early MRI.
- A “dangerous” HINTS pattern (normal head impulse, direction-changing nystagmus, or skew deviation) indicates stroke until proven otherwise and requires urgent neuroimaging.
- Benign paroxysmal positional vertigo is the most common cause of vertigo—diagnose with Dix-Hallpike and treat immediately with the Epley maneuver.
- The classic triad of episodic vertigo, fluctuating hearing loss, and tinnitus suggests Menière disease; episodic vertigo with migraine features suggests vestibular migraine.
- Vestibular suppressants (meclizine, diazepam) should be limited to the acute phase only—long-term use impairs central compensation and perpetuates symptoms.
- Vestibular rehabilitation is the most effective treatment for chronic vestibular dysfunction and should be offered to all appropriate patients.
- In elderly patients, dizziness is often multifactorial—address all contributing factors including medications, sensory deficits, and cardiovascular issues.
- Persistent postural-perceptual dizziness is the most common cause of chronic non-spinning dizziness and responds to vestibular rehabilitation, SSRIs/SNRIs, and cognitive behavioral therapy.
- Always consider posterior circulation stroke in patients with acute vertigo and vascular risk factors, even if neurological examination appears normal—cerebellar strokes can present with isolated vertigo.
Quick Reference Algorithm
Systematic Approach to Dizziness and Vertigo:
- Identify urgency: Look for red flags (neurological symptoms, sudden hearing loss, severe headache, syncope, stroke risk factors)
- Classify by timing: Acute continuous, episodic triggered, episodic spontaneous, or chronic persistent
- Perform targeted examination: HINTS for acute vestibular syndrome; Dix-Hallpike for positional symptoms; orthostatic vitals for presyncope
- Distinguish peripheral from central: Use HINTS pattern, nystagmus characteristics, and associated symptoms
- Identify the specific syndrome: Benign paroxysmal positional vertigo, vestibular neuritis, Menière disease, vestibular migraine, orthostatic hypotension, persistent postural-perceptual dizziness, or other
- Order targeted investigations: Based on syndrome—many diagnoses are clinical and do not require extensive testing
- Treat appropriately: Repositioning for benign paroxysmal positional vertigo; short-term symptom control for acute vestibular neuritis; disease-specific therapy for identified conditions
- Refer for vestibular rehabilitation: For all patients with persistent vestibular symptoms—this is the most effective long-term intervention
- Review medications: Discontinue or reduce vestibular suppressants and other offending agents
- Address comorbidities: Treat anxiety, migraine, and other conditions that perpetuate dizziness