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 and diagnostically challenging complaints in clinical practice. It accounts for approximately 5% of all primary care visits and 4% of emergency department presentations. In patients over age 75, dizziness is the most common reason for visiting a physician, affecting up to 30% of elderly individuals. The lifetime prevalence of significant dizziness is estimated at 20-30% of the general population. Despite its frequency, dizziness remains diagnostically challenging because the term encompasses multiple distinct sensations with vastly different etiologies and clinical implications.
Definition and Terminology
Dizziness is a nonspecific term used by patients to describe various sensations of altered spatial orientation or perceived motion. Clinically, it is essential to differentiate between four distinct subtypes:
- Vertigo: An illusion of movement (usually spinning) when no movement is occurring, indicating vestibular system dysfunction
- Presyncope: A sensation of impending faint or “nearly blacking out,” suggesting cerebral hypoperfusion
- Disequilibrium: A sense of imbalance or unsteadiness, particularly when walking, often related to sensory or motor deficits
- Lightheadedness: A vague, nonspecific sensation often described as “floating” or “swimming,” frequently associated with psychiatric or metabolic causes
Classification by Duration
| Category | Duration | Common Causes | Clinical Significance |
|---|---|---|---|
| Acute Sustained | Continuous for hours to days | Vestibular neuritis, labyrinthitis, cerebellar stroke, vestibular migraine | Requires urgent differentiation between peripheral and central causes; stroke must be excluded |
| Episodic (seconds) | Brief episodes lasting seconds | Benign paroxysmal positional vertigo, orthostatic hypotension, cardiac arrhythmia | Triggered episodes suggest benign paroxysmal positional vertigo; spontaneous episodes raise cardiac concern |
| Episodic (minutes to hours) | Episodes lasting minutes to hours | Ménière disease, vestibular migraine, transient ischemic attack, panic disorder | Recurrent spontaneous episodes require systematic evaluation; vertebrobasilar transient ischemic attack must be considered |
| Chronic persistent | Continuous for weeks to months | Persistent postural-perceptual dizziness, bilateral vestibulopathy, medication effects, anxiety disorders | Often multifactorial; psychiatric comorbidity common; vestibular rehabilitation indicated |
Classification by Character
Vestibular (True Vertigo)
Description: Illusion of rotational movement, either of self or environment. Patients often describe the room spinning or feeling like they are on a merry-go-round.
Associated symptoms: Nausea, vomiting, nystagmus, postural instability, worsening with head movement
Clinical implication: Indicates dysfunction within the vestibular system—either peripheral (inner ear, vestibular nerve) or central (brainstem, cerebellum)
Non-Vestibular Dizziness
Description: Encompasses presyncope, disequilibrium, and nonspecific lightheadedness. Patients may describe feeling faint, off-balance, or “woozy” without true rotational sensation.
Associated symptoms: Varies by subtype—palpitations with cardiac causes, anxiety with psychiatric causes, weakness or numbness with neurological causes
Clinical implication: Requires broader differential including cardiovascular, metabolic, neurological, and psychiatric etiologies
Classification by Triggers and Timing
| Trigger or Pattern | Description | Suggests |
|---|---|---|
| Positional | Triggered by specific head positions (lying down, rolling over, looking up) | Benign paroxysmal positional vertigo (most common cause of vertigo overall) |
| Orthostatic | Occurs upon standing from sitting or lying position | Orthostatic hypotension, autonomic dysfunction, volume depletion, medication effect |
| Spontaneous | Episodes occur without identifiable trigger | Ménière disease, vestibular migraine, cardiac arrhythmia, transient ischemic attack |
| Head movement-provoked | Any head movement worsens symptoms (not position-specific) | Acute vestibular syndrome (vestibular neuritis, stroke), bilateral vestibulopathy |
| Visually induced | Triggered by complex visual environments (supermarkets, crowds, screens) | Persistent postural-perceptual dizziness, vestibular migraine, visual vertigo |
| Sound or pressure induced | Triggered by loud sounds or pressure changes (Valsalva, coughing) | Superior semicircular canal dehiscence, perilymphatic fistula |
Key Concept: The TiTrATE Approach
Modern classification emphasizes moving away from asking “What type of dizziness is it?” toward using the TiTrATE framework:
- Timing — Is it episodic or continuous? How long do episodes last?
- Triggers — What provokes the symptoms?
- And
- Targeted
- Examination — Focused bedside tests to localize the lesion
This approach improves diagnostic accuracy compared to traditional symptom quality-based questioning, as patients often have difficulty articulating their dizziness type reliably.
Frequency of Common Causes
| Condition | Approximate Frequency | Key Population |
|---|---|---|
| Benign paroxysmal positional vertigo | 17-42% of vertigo cases | Increases with age; female predominance |
| Vestibular migraine | 10-15% of dizziness cases | History of migraine; female predominance |
| Ménière disease | 3-5% of vertigo cases | Age 40-60; associated with hearing loss |
| Vestibular neuritis | 5-10% of vertigo cases | Often post-viral; acute presentation |
| Psychiatric dizziness | 15-20% of chronic dizziness | Anxiety disorders, panic, depression |
| Central causes (stroke, tumor) | 3-5% of acute vertigo | Elderly, vascular risk factors |
2. Pathophysiology and Mechanisms
Understanding the underlying mechanisms of dizziness and vertigo
Spatial orientation and balance depend on the integration of three sensory systems: the vestibular apparatus (inner ear), visual input, and proprioceptive feedback from muscles and joints. The brain continuously integrates these inputs to generate a coherent sense of position and movement. When these inputs conflict or when the integrating centers are damaged, the sensation of dizziness results. Understanding these pathways is essential for localizing the lesion and guiding diagnostic evaluation.
The Vestibular System
| Component | Structure | Function |
|---|---|---|
| Semicircular Canals | Three paired canals (horizontal, anterior, posterior) oriented in perpendicular planes | Detect angular acceleration (rotational head movement) via endolymph flow deflecting the cupula |
| Otolith Organs | Utricle (horizontal plane) and saccule (vertical plane) | Detect linear acceleration and head position relative to gravity via calcium carbonate crystals (otoconia) |
| Vestibular Nerve | Superior and inferior divisions of cranial nerve VIII | Transmits vestibular signals from labyrinth to brainstem vestibular nuclei |
| Vestibular Nuclei | Four nuclei in the pontomedullary junction | Primary integration center; connects to oculomotor nuclei, spinal cord, cerebellum, and cortex |
| Vestibulocerebellum | Flocculonodular lobe and vermis of cerebellum | Calibrates vestibular reflexes; processes vestibular input for postural control |
| Vestibular Cortex | Parieto-insular vestibular cortex, temporoparietal junction | Conscious perception of motion and spatial orientation |
Critical Vestibular Reflexes
Vestibulo-Ocular Reflex
Pathway: Vestibular labyrinth → vestibular nuclei → oculomotor nuclei → extraocular muscles
Function: Stabilizes gaze during head movement by generating compensatory eye movements equal and opposite to head motion
Clinical relevance: Dysfunction produces nystagmus and oscillopsia; tested by head impulse test
Vestibulospinal Reflex
Pathway: Vestibular nuclei → lateral and medial vestibulospinal tracts → spinal motor neurons
Function: Maintains postural stability by adjusting muscle tone in response to changes in head position
Clinical relevance: Dysfunction causes postural instability, falling toward the lesion side in acute unilateral loss
Vestibulocollic Reflex
Pathway: Vestibular nuclei → cervical motor neurons
Function: Stabilizes head position on the body during movement
Clinical relevance: Contributes to gaze stability; works synergistically with vestibulo-ocular reflex
Peripheral versus Central Vestibular Dysfunction
| Feature | Peripheral (Labyrinth or Nerve) | Central (Brainstem or Cerebellum) |
|---|---|---|
| Location | Inner ear labyrinth or vestibular nerve (CN VIII) | Vestibular nuclei, brainstem, or cerebellum |
| Nystagmus pattern | Unidirectional, horizontal or horizonto-torsional; inhibited by visual fixation | May be direction-changing, purely vertical, or purely torsional; not inhibited by fixation |
| Vertigo severity | Usually severe with prominent nausea and vomiting | May be mild or absent despite significant neurological findings |
| Hearing loss | May be present (labyrinthitis, Ménière disease) | Usually absent unless anterior inferior cerebellar artery territory involved |
| Neurological signs | Absent (vestibular signs only) | Often present: diplopia, dysarthria, dysphagia, weakness, sensory loss, ataxia |
| Head impulse test | Abnormal (catch-up saccade toward affected side) | Usually normal (central pathways can compensate) |
| Gait | Unsteady but able to walk; falls toward affected side | May be severely ataxic; unable to walk in cerebellar stroke |
How Specific Conditions Cause Dizziness
| Condition | Mechanism | Clinical Implication |
|---|---|---|
| Benign paroxysmal positional vertigo | Displaced otoconia (calcium carbonate crystals) from the utricle migrate into a semicircular canal, causing inappropriate cupular deflection with head position changes | Position-specific symptoms; treatable with canalith repositioning maneuvers (e.g., Epley maneuver for posterior canal) |
| Vestibular neuritis | Inflammation of the vestibular nerve (likely viral) causes acute unilateral vestibular hypofunction, creating asymmetric vestibular input | Acute vestibular syndrome with positive head impulse test; spares hearing (distinguishes from labyrinthitis) |
| Labyrinthitis | Inflammation involves both vestibular and cochlear portions of the inner ear, often following viral upper respiratory infection or bacterial otitis media | Vertigo with associated hearing loss; bacterial form requires urgent treatment |
| Ménière disease | Endolymphatic hydrops (distension of the endolymphatic system) causes intermittent rupture of membranes separating endolymph and perilymph | Episodic vertigo with fluctuating hearing loss, tinnitus, and aural fullness; progressive hearing loss over time |
| Vestibular migraine | Central vestibular processing dysfunction during migraine; may involve cortical spreading depression affecting vestibular cortex | Vertigo episodes associated with migraine features; responds to migraine prophylaxis |
| Posterior circulation stroke | Ischemia to vestibular nuclei, cerebellum, or brainstem disrupts central vestibular processing; may initially mimic peripheral vestibulopathy | Life-threatening; must be excluded in acute vestibular syndrome using HINTS examination |
| Orthostatic hypotension | Inadequate baroreceptor-mediated vasoconstriction on standing causes cerebral hypoperfusion | Presyncope rather than true vertigo; reproduced by orthostatic vital signs |
| Persistent postural-perceptual dizziness | Maladaptive central processing of vestibular and visual information, often triggered by initial vestibular insult with failed compensation | Chronic dizziness exacerbated by visual stimuli and upright posture; responds to vestibular rehabilitation and selective serotonin reuptake inhibitors |
Often Overlooked Mechanism: The “Dangerous” Normal Head Impulse Test
In acute vestibular syndrome, a normal head impulse test is paradoxically concerning. Peripheral vestibular lesions cause an abnormal head impulse test because the damaged labyrinth cannot generate the vestibulo-ocular reflex. Central lesions (brainstem or cerebellar stroke) spare the peripheral vestibular apparatus, so the head impulse test remains normal despite devastating disease. This is the “I” in the HINTS examination (Head Impulse, Nystagmus, Test of Skew)—a normal head impulse test in acute sustained vertigo should raise immediate concern for posterior circulation stroke.
Non-Vestibular Mechanisms of Dizziness
Cardiovascular Causes
Orthostatic hypotension: Failure of autonomic compensation on standing leads to transient cerebral hypoperfusion.
Cardiac arrhythmia: Reduced cardiac output (bradyarrhythmia or tachyarrhythmia) causes global cerebral hypoperfusion and presyncope.
Structural heart disease: Aortic stenosis, hypertrophic cardiomyopathy, or pulmonary embolism can cause exertional presyncope.
Psychiatric and Functional Causes
Panic disorder: Hyperventilation causes hypocapnia and respiratory alkalosis, leading to cerebral vasoconstriction and lightheadedness.
Anxiety disorders: Heightened interoceptive awareness and catastrophic interpretation of normal body sensations.
Persistent postural-perceptual dizziness: Functional disorder with altered sensory integration and increased reliance on visual input.
The Vestibular Compensation Process
Understanding Central Compensation
After acute unilateral vestibular loss, the brain undergoes a remarkable process of central compensation over days to weeks:
- Acute phase (hours to days): Profound vertigo, nausea, nystagmus, and postural instability due to asymmetric vestibular input
- Compensation phase (days to weeks): Central nervous system rebalances vestibular nuclei activity; symptoms gradually resolve
- Factors promoting compensation: Early mobilization, vestibular rehabilitation exercises, avoiding vestibular suppressant medications beyond the acute phase
- Factors impairing compensation: Advanced age, visual or proprioceptive deficits, central nervous system disease, prolonged bed rest, chronic vestibular suppressant use
Failure of compensation results in chronic dizziness and may contribute to the development of persistent postural-perceptual dizziness.
3. History Taking
A comprehensive approach to eliciting the dizziness and vertigo history
Red Flags — Require Urgent Evaluation
- Acute onset with neurological symptoms — Diplopia, dysarthria, dysphagia, facial weakness, limb weakness or numbness suggests posterior circulation stroke
- Severe headache — Especially “thunderclap” onset; consider cerebellar hemorrhage or subarachnoid hemorrhage
- Inability to walk — Severe truncal ataxia suggests cerebellar stroke even without limb ataxia
- New onset in patient with vascular risk factors — Hypertension, diabetes, atrial fibrillation, prior stroke increase stroke risk
- Acute hearing loss with vertigo — Suggests labyrinthitis or anterior inferior cerebellar artery stroke; both require urgent evaluation
- Syncope or near-syncope with exertion — Raises concern for cardiac arrhythmia or structural heart disease
- Head or neck trauma preceding symptoms — Consider vertebral artery dissection or perilymphatic fistula
- Fever with vertigo and headache — Consider meningitis or cerebellar abscess
Systematic History: The “SPINS” Approach
Use the mnemonic “SPINS” to ensure comprehensive history taking for dizziness:
- S — Sensation: What exactly does the patient feel? Spinning (vertigo), faintness (presyncope), imbalance (disequilibrium), or vague lightheadedness? Ask: “Without using the word ‘dizzy,’ describe what you feel.”
- P — Provocation and Pattern: What triggers the episodes? Are symptoms positional, orthostatic, spontaneous, or constant? What is the temporal pattern—episodic or continuous?
- I — Intensity and Impact: How severe are symptoms? Can the patient function? Is there nausea, vomiting, or falls? How does this affect daily life?
- N — Neurological and otological symptoms: Any hearing loss, tinnitus, aural fullness? Any double vision, slurred speech, weakness, numbness, difficulty swallowing?
- S — Setting and Seconds-to-hours: When did it start? How long do episodes last—seconds, minutes, hours, or days? What was the patient doing when it began? Any recent illness, medication changes, or stressors?
The Critical Importance of Timing
| Duration of Episodes | Most Likely Diagnoses | Key Distinguishing Questions |
|---|---|---|
| Seconds (less than 1 minute) | Benign paroxysmal positional vertigo, orthostatic hypotension, cardiac arrhythmia | “Does it happen when you change position?” “Does it happen when you stand up?” “Do you feel your heart racing or skipping?” |
| Minutes to hours | Ménière disease, vestibular migraine, transient ischemic attack, panic attack | “Is there hearing change or ear fullness during attacks?” “Do you get headaches?” “Do you feel anxious or short of breath?” |
| Days (continuous) | Vestibular neuritis, labyrinthitis, posterior circulation stroke | “Has the vertigo been constant since it started?” “Any hearing loss?” “Any neurological symptoms?” |
| Weeks to months (chronic) | Persistent postural-perceptual dizziness, bilateral vestibulopathy, medication effect, anxiety | “Is it worse in busy visual environments?” “What medications are you taking?” “How is your mood?” |
Targeted Questions by Suspected Cause
| Suspected Cause | Key Features | Ask This Question |
|---|---|---|
| Benign paroxysmal positional vertigo | Brief spinning triggered by specific head positions; lying down, rolling over, looking up | “Does the room spin when you roll over in bed or look up at a high shelf?” |
| Vestibular neuritis | Acute onset severe vertigo, continuous for days, often post-viral, no hearing loss | “Did the vertigo come on suddenly and stay constant? Did you have a cold or flu recently?” |
| Labyrinthitis | Acute vertigo with hearing loss and/or tinnitus; may follow upper respiratory infection or otitis media | “Have you noticed any change in your hearing or ringing in your ear along with the dizziness?” |
| Ménière disease | Episodic vertigo lasting 20 minutes to 12 hours with fluctuating hearing loss, tinnitus, and ear fullness | “During your dizzy spells, do you notice your hearing gets worse, or do you have ringing or fullness in one ear?” |
| Vestibular migraine | Episodic vertigo with migraine features; history of migraine; photophobia, phonophobia, or headache during attacks | “Do you get headaches? During the dizziness, are you sensitive to light or sound?” |
| Posterior circulation stroke or transient ischemic attack | Vertigo with neurological symptoms; vascular risk factors; sudden onset | “Have you had any double vision, slurred speech, difficulty swallowing, or weakness or numbness anywhere?” |
| Orthostatic hypotension | Lightheadedness or presyncope on standing; improves with sitting or lying down | “Does the dizziness happen when you stand up from sitting or lying down? Does it go away if you sit back down?” |
| Cardiac arrhythmia | Presyncope or syncope; palpitations; may be exertional or occur at rest | “Do you feel your heart racing, pounding, or skipping beats during the episodes? Have you ever fainted?” |
| Persistent postural-perceptual dizziness | Chronic dizziness worsened by upright posture, active or passive motion, complex visual stimuli | “Is the dizziness worse in places like supermarkets or crowds? Does scrolling on your phone make it worse?” |
| Panic disorder or anxiety | Dizziness with hyperventilation, palpitations, sweating, fear of dying; situational triggers | “When you feel dizzy, do you also feel short of breath, have a racing heart, or feel very anxious or scared?” |
Medication and Substance History
Medications That Cause or Worsen Dizziness
- Antihypertensives — Orthostatic hypotension, especially in elderly; all classes can contribute
- Diuretics — Volume depletion causing orthostatic symptoms; hypokalemia causing arrhythmia
- Aminoglycoside antibiotics — Vestibulotoxicity causing bilateral vestibulopathy; often irreversible
- Anticonvulsants — Phenytoin, carbamazepine cause cerebellar toxicity at high levels
- Benzodiazepines and sedatives — Central vestibular suppression and impaired compensation
- Antidepressants — Orthostatic hypotension (tricyclics); discontinuation syndrome (selective serotonin reuptake inhibitors)
- Opioids — Central nervous system depression and orthostatic hypotension
- Phosphodiesterase-5 inhibitors — Hypotension, especially with nitrates
- Loop diuretics (high dose) — Ototoxicity, especially with aminoglycosides
Substance and Social History
- Alcohol: Acute intoxication causes positional alcohol nystagmus; chronic use causes cerebellar degeneration and thiamine deficiency
- Caffeine: May trigger or worsen vestibular migraine; can cause palpitations
- Cannabis: Can cause orthostatic hypotension and altered perception
- Occupation: Exposure to ototoxic chemicals (solvents, heavy metals); work at heights increases fall risk with vestibular dysfunction
- Recent travel: Mal de débarquement syndrome after prolonged travel; infectious causes if endemic area
- Diving or flying: Barotrauma causing perilymphatic fistula or alternobaric vertigo
- Trauma: Head injury can cause benign paroxysmal positional vertigo, labyrinthine concussion, or perilymphatic fistula
Relevant Past Medical History
| Condition | Relevance to Dizziness Evaluation |
|---|---|
| Migraine history | Vestibular migraine is common in migraineurs; may occur without headache |
| Cardiovascular disease | Increases risk of stroke, arrhythmia, and orthostatic hypotension |
| Diabetes mellitus | Autonomic neuropathy causing orthostatic hypotension; increased stroke risk |
| Anxiety or depression | High comorbidity with chronic dizziness; panic disorder mimics vestibular symptoms |
| Autoimmune disease | Autoimmune inner ear disease; Cogan syndrome; multiple sclerosis |
| Previous ear surgery or ear disease | Cholesteatoma, chronic otitis media, or surgical complications |
| Prior vestibular disorders | Recurrence of benign paroxysmal positional vertigo is common; incomplete compensation from prior episodes |
4. Physical Examination
A systematic approach to examining patients with dizziness and vertigo
Examination Framework: The physical examination in dizziness serves two critical purposes: (1) differentiating peripheral from central vestibular disorders, and (2) identifying non-vestibular causes. Use a systematic approach that includes general assessment, cardiovascular evaluation, neurological examination, and targeted vestibular testing.
General Inspection
- Appearance: Diaphoresis and pallor suggest presyncope; severe distress with inability to keep still suggests acute peripheral vestibular loss
- Nausea and vomiting: More prominent in peripheral vestibular disorders; less severe vertigo with prominent nausea suggests peripheral cause
- Posture and stability: Patient leaning or falling to one side; inability to sit unsupported suggests severe vestibular or cerebellar dysfunction
- Mental status: Confusion or altered consciousness suggests central pathology, cardiac cause, or metabolic derangement rather than isolated vestibular disease
- Spontaneous nystagmus: Observe for eye movements at rest—are the eyes still or drifting?
Vital Signs
| Vital Sign | What to Look For | Clinical Significance |
|---|---|---|
| Orthostatic blood pressure | Measure supine, then after standing for 1 and 3 minutes; drop of systolic ≥20 mmHg or diastolic ≥10 mmHg is positive | Orthostatic hypotension confirms presyncope etiology; common in elderly, dehydrated, or those on antihypertensives |
| Heart rate | Tachycardia, bradycardia, or irregular rhythm | Arrhythmia as cause of presyncope; inadequate heart rate increase with standing suggests autonomic dysfunction |
| Blood pressure (both arms) | Asymmetry greater than 20 mmHg systolic | Suggests subclavian steal syndrome or aortic dissection in appropriate clinical context |
| Temperature | Fever | Infectious labyrinthitis, meningitis, or cerebellar abscess |
| Respiratory rate | Tachypnea, hyperventilation | May indicate panic attack, metabolic acidosis, or cardiopulmonary disease |
| Oxygen saturation | Hypoxemia | Cardiopulmonary cause of dizziness; pulmonary embolism in appropriate setting |
The HINTS Examination: Differentiating Central from Peripheral Causes
Critical Application
The HINTS examination applies only to patients with acute vestibular syndrome—acute onset continuous vertigo with nystagmus, nausea/vomiting, and gait instability lasting hours to days. It should not be applied to episodic dizziness or chronic symptoms. When properly performed, HINTS is more sensitive for posterior circulation stroke than early MRI.
| Test | How to Perform | Peripheral (Reassuring) | Central (Dangerous) |
|---|---|---|---|
| Head Impulse Test | Patient fixates on examiner’s nose. Examiner rapidly rotates patient’s head 10-20° to each side while watching for corrective saccades. | ABNORMAL: Catch-up saccade seen when turning toward affected ear (vestibular hypofunction) | NORMAL: Eyes stay fixed on target without corrective saccade (central compensation intact despite stroke) |
| Nystagmus pattern | Observe nystagmus direction in primary gaze and with gaze to each side. Use Frenzel goggles if available to remove visual fixation. | Unidirectional: Fast phase always beats away from the affected ear regardless of gaze direction; suppressed by visual fixation | Direction-changing: Fast phase changes direction with gaze (gaze-evoked nystagmus); vertical or purely torsional nystagmus; not suppressed by fixation |
| Test of Skew | Cover-uncover test: alternately cover each eye while patient fixates on examiner’s nose. Watch for vertical refixation movement. | NEGATIVE: No vertical eye movement with alternate cover | POSITIVE: Vertical refixation (skew deviation) indicates brainstem or cerebellar lesion |
HINTS Rule: In acute vestibular syndrome, if ANY of the following are present, the patient has a central cause until proven otherwise:
- Normal head impulse test (“Impulse Normal”)
- Direction-changing nystagmus or vertical/torsional nystagmus (“Nystagmus: fast-phase alternating”)
- Positive test of skew (“Skew present”)
The “benign” peripheral pattern: Abnormal head impulse test + Unidirectional nystagmus + Negative skew = likely vestibular neuritis
Positional Testing: The Dix-Hallpike Maneuver
| Step | Technique | What to Observe |
|---|---|---|
| 1. Position patient | Patient sits on examination table with legs extended. Stand beside patient. | Ensure adequate space for patient to lie back with head hanging over edge |
| 2. Turn head | Turn patient’s head 45° toward the side being tested | This aligns the posterior semicircular canal with the plane of movement |
| 3. Rapidly recline | Support head and rapidly lower patient to supine with head extended 20-30° below horizontal, maintaining 45° rotation | Watch patient’s eyes closely for nystagmus onset |
| 4. Observe for 30-60 seconds | Keep patient in position; observe for nystagmus | Positive: upbeat-torsional nystagmus (fast phase toward the floor) with 2-20 second latency, lasting less than 60 seconds, with vertigo |
| 5. Return to sitting | Bring patient back to sitting position | May see reversal of nystagmus direction on sitting up |
| 6. Repeat on other side | After symptoms resolve, test the opposite side | Bilateral benign paroxysmal positional vertigo occurs in 10-15% of cases |
Interpreting the Dix-Hallpike
Classic positive (posterior canal benign paroxysmal positional vertigo): Latency (2-20 seconds) + Upbeat-torsional nystagmus + Duration less than 60 seconds + Fatigues with repetition
Atypical features suggesting central cause: No latency (immediate onset), purely vertical or purely horizontal nystagmus, does not fatigue, persists beyond 60 seconds
Horizontal nystagmus on Dix-Hallpike: Consider horizontal canal benign paroxysmal positional vertigo; perform supine roll test instead
Neurological Examination
Cranial Nerves
- II: Visual fields (posterior cerebral artery territory)
- III, IV, VI: Eye movements, pupils (brainstem)
- V: Facial sensation (lateral medullary syndrome)
- VII: Facial weakness (cerebellopontine angle lesion)
- VIII: Hearing (Weber and Rinne tests)
- IX, X: Palate, gag (lateral medullary syndrome)
- XI: Trapezius, sternocleidomastoid
- XII: Tongue (medial medullary syndrome)
Cerebellar Examination
- Finger-to-nose: Intention tremor, past-pointing
- Heel-to-shin: Lower limb coordination
- Rapid alternating movements: Dysdiadochokinesia
- Gait: Wide-based ataxic gait
- Tandem walking: Very sensitive for cerebellar dysfunction
- Truncal ataxia: Inability to sit unsupported suggests midline cerebellar lesion
- Dysarthria: Scanning or slurred speech
Otological Examination
| Component | What to Examine | Clinical Significance |
|---|---|---|
| External ear and canal | Cerumen impaction, otitis externa, vesicles (Ramsay Hunt syndrome) | Herpes zoster oticus causes vertigo, facial palsy, and vesicles in ear canal |
| Tympanic membrane | Perforation, effusion, cholesteatoma, retraction | Middle ear disease can cause labyrinthine involvement; cholesteatoma can erode into labyrinth |
| Weber test | Place tuning fork (512 Hz) on forehead midline; ask which ear is louder | Lateralizes to affected ear in conductive loss; lateralizes away from affected ear in sensorineural loss |
| Rinne test | Compare air conduction (fork near ear) to bone conduction (fork on mastoid) | Air > bone is normal or sensorineural loss; Bone > air indicates conductive loss |
| Finger rub test | Rub fingers near each ear; compare perception | Screening for asymmetric hearing loss; reduced hearing suggests cochlear involvement |
Cardiovascular Examination
- Heart sounds: Murmurs (aortic stenosis causing exertional syncope), irregular rhythm (atrial fibrillation)
- Carotid examination: Bruits (carotid stenosis); avoid carotid sinus massage without monitoring
- Jugular venous pressure: Elevated in heart failure
- Peripheral pulses: Irregular rhythm, pulse deficit
- Edema: Suggests heart failure or venous insufficiency
Gait Assessment
| Gait Pattern | Characteristics | Suggests |
|---|---|---|
| Vestibular gait | Unsteady, veering to one side (toward lesion in acute unilateral loss); able to walk but with support | Peripheral vestibular lesion; gradual improvement with compensation |
| Cerebellar ataxia | Wide-based, irregular step length, unable to tandem walk; may be unable to walk at all | Cerebellar stroke or other cerebellar pathology; very concerning finding |
| Sensory ataxia | High-stepping gait, worse with eyes closed (positive Romberg), looks at feet while walking | Proprioceptive loss (peripheral neuropathy, posterior column disease) |
| Functional/psychogenic | Dramatic lurching without falling, inconsistent deficits, knee buckling with recovery | Functional neurological disorder; does not exclude comorbid organic disease |
Expected Findings by Etiology
| Condition | HINTS Examination | Positional Testing | Other Key Findings |
|---|---|---|---|
| Benign paroxysmal positional vertigo | Usually normal (not acute vestibular syndrome) | Positive Dix-Hallpike with characteristic nystagmus | Normal between episodes; normal neurological examination |
| Vestibular neuritis | Abnormal head impulse test, unidirectional nystagmus, negative skew | Not indicated | Normal hearing; no neurological deficits; unable to stand still with eyes closed |
| Posterior circulation stroke | Normal head impulse test, direction-changing nystagmus, or positive skew | Not indicated | May have cranial nerve deficits, limb ataxia, dysarthria; severe truncal ataxia |
| Ménière disease | May be abnormal during attacks | Usually negative | Fluctuating sensorineural hearing loss; low-frequency loss early; normal between attacks |
| Vestibular migraine | Variable; may have positional nystagmus | May have positional nystagmus not classic for benign paroxysmal positional vertigo | Photophobia, phonophobia; often normal examination between attacks |
| Orthostatic hypotension | Normal | Negative | Positive orthostatic vital signs; reproduces symptoms |
Important Teaching Point
A “reassuring” HINTS examination requires expertise. Studies showing HINTS outperforms MRI were conducted by neuro-otologists and stroke specialists. The head impulse test has a significant learning curve—an inexperienced examiner may miss subtle catch-up saccades or misinterpret findings. If you are not confident in your HINTS examination skills and there is clinical concern for stroke, proceed with imaging regardless of examination findings. When in doubt, err on the side of caution.
5. Differential Diagnosis
Systematic approach organized by timing, probability, and clinical features
Diagnostic Framework: Rather than asking “What type of dizziness is this?”, organize the differential by the two most discriminating features:
- Timing: Is this an acute continuous episode, episodic recurrent attacks, or chronic persistent symptoms?
- Triggers: Is this triggered by position, standing, or spontaneous?
This approach yields distinct differential diagnoses with different evaluation pathways.
Acute Vestibular Syndrome (Continuous Vertigo for Hours to Days)
| Probability | Condition | Key Features | Red Flags for This Diagnosis |
|---|---|---|---|
| COMMON (approximately 70-80%) | Vestibular neuritis | Acute onset severe vertigo, continuous for days; often post-viral; nausea and vomiting prominent; no hearing loss | Normal head impulse test (suggests central cause instead) |
| COMMON | Labyrinthitis | Acute vestibular syndrome with associated hearing loss and/or tinnitus; may follow upper respiratory infection or otitis media | Bacterial labyrinthitis (from otitis media) requires urgent treatment |
| LESS COMMON (approximately 15-20%) | Vestibular migraine (acute presentation) | Prolonged vertigo episode with migraine features; history of migraine; photophobia and phonophobia | First severe episode requires exclusion of stroke |
| UNCOMMON BUT CRITICAL (approximately 5-10%) | Posterior circulation stroke | Acute vertigo with or without neurological signs; vascular risk factors; cerebellar or brainstem territory | Normal head impulse test, direction-changing nystagmus, skew deviation, inability to walk, any neurological deficit |
| UNCOMMON BUT CRITICAL | Cerebellar hemorrhage | Sudden severe vertigo with headache; may rapidly deteriorate; hypertension common | Severe headache, decreasing consciousness, severe ataxia—neurosurgical emergency |
| RARE | Multiple sclerosis (acute demyelinating event) | Acute vertigo in young adult; may have other neurological symptoms; history of prior episodes | Age less than 50, prior neurological episodes, internuclear ophthalmoplegia |
Episodic Vestibular Syndrome (Recurrent Attacks)
Triggered Episodic Vertigo
| Probability | Condition | Duration | Trigger | Key Distinguishing Features |
|---|---|---|---|---|
| VERY COMMON (approximately 50%) | Benign paroxysmal positional vertigo | Seconds to 1 minute | Specific head positions (lying down, rolling over, looking up) | Positive Dix-Hallpike maneuver; characteristic latency and fatigability; no hearing symptoms |
| COMMON | Orthostatic hypotension | Seconds to minutes | Standing from sitting or lying | Presyncope rather than true vertigo; positive orthostatic vital signs; improves with recumbency |
| LESS COMMON | Superior semicircular canal dehiscence | Seconds | Loud sounds (Tullio phenomenon), pressure changes (Valsalva, coughing) | Sound-induced vertigo; autophony (hearing own voice or eye movements); conductive hyperacusis |
| LESS COMMON | Perilymphatic fistula | Seconds to minutes | Pressure changes, straining, trauma | History of barotrauma, ear surgery, or head injury; fluctuating hearing loss |
Spontaneous Episodic Vertigo
| Probability | Condition | Duration | Key Distinguishing Features |
|---|---|---|---|
| COMMON (approximately 35%) | Vestibular migraine | Minutes to 72 hours | History of migraine; vertigo may occur with or without headache; photophobia, phonophobia, or visual aura; triggers include stress, sleep deprivation, certain foods |
| COMMON (approximately 20%) | Ménière disease | 20 minutes to 12 hours | Classic triad: episodic vertigo + fluctuating sensorineural hearing loss + tinnitus; aural fullness; progressive low-frequency hearing loss |
| LESS COMMON | Panic disorder | Minutes (typically 10-30 minutes) | Dizziness with palpitations, dyspnea, chest tightness, fear of dying; situational triggers; responds to anxiolytics |
| LESS COMMON | Cardiac arrhythmia | Seconds to minutes | Presyncope or syncope; palpitations; may be exertional; abnormal electrocardiogram or Holter monitor |
| UNCOMMON BUT SERIOUS | Vertebrobasilar transient ischemic attack | Minutes (typically less than 1 hour) | Vertigo with other posterior circulation symptoms (diplopia, dysarthria, ataxia, visual field loss); vascular risk factors; vertigo rarely isolated |
| RARE | Vestibular paroxysmia | Seconds to 1-2 minutes | Very brief attacks (typically less than 1 minute); many attacks per day; caused by neurovascular compression of CN VIII; responds to carbamazepine |
| RARE | Episodic ataxia type 2 | Hours | Episodes of ataxia and vertigo; interictal nystagmus; family history; responds to acetazolamide |
Chronic Vestibular Syndrome (Persistent Symptoms for Weeks to Months)
Step-by-Step Approach to Chronic Dizziness:
- Step 1: Rule out medication effects—review all medications, especially recent additions or dose changes
- Step 2: Assess for psychiatric comorbidity—anxiety and depression are highly prevalent and may be primary or secondary
- Step 3: Evaluate for incomplete compensation from prior vestibular insult
- Step 4: Consider persistent postural-perceptual dizziness if criteria are met
- Step 5: Investigate for bilateral vestibulopathy or other structural causes if suspected
| Probability | Condition | Key Distinguishing Features |
|---|---|---|
| COMMON (approximately 25%) | Persistent postural-perceptual dizziness | Chronic dizziness (3 months or more) worsened by upright posture, active or passive motion, and complex visual stimuli; often follows acute vestibular event; responds to vestibular rehabilitation and selective serotonin reuptake inhibitors |
| COMMON (approximately 20%) | Anxiety and depressive disorders | Chronic dizziness with prominent anxiety, hyperventilation, or depressive symptoms; may coexist with vestibular disorders; screening questionnaires helpful |
| COMMON | Medication-induced dizziness | Temporal relationship to medication initiation or dose change; multiple potential culprits in polypharmacy; improvement with medication adjustment |
| LESS COMMON | Incomplete vestibular compensation | Persistent symptoms after acute vestibular event; worsened by head movement; improves with vestibular rehabilitation |
| LESS COMMON | Bilateral vestibulopathy | Chronic imbalance worse in darkness or on uneven surfaces; oscillopsia with head movement; bilateral abnormal head impulse test; often aminoglycoside-related |
| UNCOMMON | Cerebellar degeneration | Progressive ataxia and imbalance; may be alcoholic, paraneoplastic, or hereditary; cerebellar signs on examination |
| RARE | Vestibular schwannoma (acoustic neuroma) | Gradual unilateral hearing loss and tinnitus; imbalance more common than vertigo; progressive over months to years; MRI diagnostic |
Anatomical Approach to Vestibular Disorders
Peripheral: Labyrinth
Benign paroxysmal positional vertigo
Ménière disease
Labyrinthitis
Superior canal dehiscence
Perilymphatic fistula
Vestibular ototoxicity
Peripheral: Vestibular Nerve
Vestibular neuritis
Vestibular schwannoma
Vestibular paroxysmia
Ramsay Hunt syndrome
Cerebellopontine angle tumors
Central: Brainstem
Brainstem stroke or transient ischemic attack
Multiple sclerosis
Brainstem encephalitis
Wernicke encephalopathy
Chiari malformation
Central: Cerebellum
Cerebellar stroke or hemorrhage
Cerebellar degeneration
Cerebellar tumor or metastasis
Episodic ataxia type 2
Paraneoplastic cerebellar syndrome
Non-Vestibular Causes of Dizziness
| Category | Conditions | Key Features |
|---|---|---|
| Cardiovascular | Orthostatic hypotension, cardiac arrhythmia, aortic stenosis, hypertrophic cardiomyopathy, pulmonary embolism | Presyncope rather than vertigo; exertional symptoms; palpitations; abnormal cardiac examination or electrocardiogram |
| Metabolic | Hypoglycemia, anemia, thyroid disorders, electrolyte abnormalities | Associated systemic symptoms; abnormal laboratory values; improvement with correction of underlying abnormality |
| Neurological (non-vestibular) | Peripheral neuropathy, cervical spondylosis, Parkinson disease, normal pressure hydrocephalus | Disequilibrium rather than vertigo; gait abnormalities; sensory deficits; other neurological findings |
| Psychiatric | Panic disorder, generalized anxiety disorder, depression, somatization | Prominent anxiety or mood symptoms; situational triggers; hyperventilation; response to psychiatric treatment |
| Ocular | New or incorrect glasses prescription, cataracts, binocular vision disorders | Visual discomfort; symptoms worse with visual tasks; improvement with eyes closed |
Drug-Induced Dizziness
| Drug or Drug Class | Mechanism | Characteristics | Management |
|---|---|---|---|
| Aminoglycoside antibiotics | Vestibulotoxicity (hair cell destruction); cumulative and often irreversible | Bilateral vestibulopathy with oscillopsia and imbalance; may present after drug completion | Prevention is key; monitor vestibular function if prolonged use; vestibular rehabilitation for established toxicity |
| Antihypertensives (all classes) | Orthostatic hypotension; excessive blood pressure lowering | Presyncope on standing; worse with dehydration or heat | Dose reduction; timing adjustment; adequate hydration |
| Anticonvulsants (phenytoin, carbamazepine) | Cerebellar toxicity at high or supratherapeutic levels | Ataxia, nystagmus, dysarthria; dose-related | Check drug levels; dose adjustment |
| Benzodiazepines and sedative-hypnotics | Central nervous system depression; impaired vestibular compensation | Generalized unsteadiness; sedation; cognitive impairment | Gradual taper; avoid in chronic dizziness (impairs compensation) |
| Antidepressants (tricyclics, mirtazapine) | Orthostatic hypotension; anticholinergic effects; sedation | Presyncope; dry mouth, blurred vision if anticholinergic | Choose agents with less orthostatic effect; slow titration |
| Opioids | Central nervous system depression; orthostatic hypotension | Sedation; unsteadiness; nausea | Dose reduction; opioid rotation if needed |
| Loop diuretics (high dose) | Ototoxicity (usually with aminoglycosides); volume depletion | Hearing loss and tinnitus with ototoxicity; orthostatic symptoms with volume depletion | Avoid concurrent aminoglycosides; monitor hearing; adequate fluid intake |
| Cisplatin and other chemotherapy | Vestibulotoxicity and ototoxicity; peripheral neuropathy | Hearing loss, tinnitus, imbalance; may be delayed onset | Baseline and monitoring audiometry; vestibular rehabilitation |
Quick Reference: “If You See This, Think This”
| Clinical Clue | Think This First | Next Step |
|---|---|---|
| Brief spinning with rolling over in bed | Benign paroxysmal positional vertigo | Dix-Hallpike maneuver; treat with Epley if positive |
| Acute continuous vertigo, post-viral, normal hearing | Vestibular neuritis | HINTS examination to exclude stroke; supportive care |
| Episodic vertigo with fluctuating hearing loss and tinnitus | Ménière disease | Audiometry; sodium restriction; diuretics |
| Episodic vertigo with migraine features | Vestibular migraine | Migraine prophylaxis; lifestyle modification |
| Acute vertigo with neurological symptoms | Posterior circulation stroke | Urgent imaging; stroke protocol |
| Dizziness on standing, resolves with sitting | Orthostatic hypotension | Orthostatic vital signs; medication review |
| Chronic dizziness worse in supermarkets | Persistent postural-perceptual dizziness | Vestibular rehabilitation; selective serotonin reuptake inhibitors |
| Progressive unilateral hearing loss and imbalance | Vestibular schwannoma | MRI with gadolinium of internal auditory canals |
| Oscillopsia with head movement, bilateral abnormal head impulse test | Bilateral vestibulopathy | Review for ototoxic exposure; vestibular rehabilitation |
| Vertigo with loud sounds or straining | Superior semicircular canal dehiscence | High-resolution temporal bone CT scan |
6. Diagnostic Investigations
A stepwise, cost-effective approach guided by clinical presentation
Key Principle: The diagnosis of most vestibular disorders is clinical, based on history and examination. Investigations serve to confirm clinical suspicion, exclude dangerous mimics, and evaluate for specific conditions when indicated. A “dizziness workup” ordered without clinical direction is rarely helpful and often misleading.
When Investigations May Not Be Needed
Clinical Diagnoses That Often Require No Testing
- Benign paroxysmal positional vertigo: Positive Dix-Hallpike with classic features is diagnostic; no imaging needed unless atypical features
- Vestibular neuritis: When HINTS examination is clearly peripheral (by experienced examiner) and no risk factors for stroke
- Orthostatic hypotension: Positive orthostatic vital signs reproducing symptoms; investigate underlying cause if unexplained
- Vestibular migraine: Meets diagnostic criteria with typical migraine history; exclude other causes if first presentation is severe
Baseline Investigations for Unexplained or Atypical Dizziness
| Investigation | Purpose | What to Look For | Practical Points |
|---|---|---|---|
| Complete blood count | Screen for anemia and infection | Hemoglobin less than 10 g/dL may cause dizziness; elevated white blood cells may indicate infection | Low yield in isolation; consider if systemic symptoms or pallor |
| Comprehensive metabolic panel | Identify metabolic derangements | Hyponatremia, hypoglycemia, uremia, significant electrolyte abnormalities | More relevant in elderly, those with comorbidities, or altered mental status |
| Thyroid function tests | Thyroid disorders can cause dizziness | Hypothyroidism or hyperthyroidism | Consider if other thyroid symptoms present or chronic unexplained dizziness |
| Electrocardiogram | Screen for arrhythmia and conduction abnormalities | Atrial fibrillation, bradycardia, heart block, prolonged QT, pre-excitation | Essential if presyncope, palpitations, or cardiac risk factors; may be normal between episodes |
| Orthostatic vital signs | Diagnose orthostatic hypotension | Drop of systolic blood pressure ≥20 mmHg or diastolic ≥10 mmHg within 3 minutes of standing | Measure supine then at 1 and 3 minutes standing; patient should be symptomatic for positive result to be clinically meaningful |
| Fingerstick glucose | Exclude hypoglycemia | Glucose less than 70 mg/dL with symptoms | Most useful if symptoms correlate with fasting or meals |
Neuroimaging
| Modality | When to Order | Advantages | Limitations |
|---|---|---|---|
| CT head without contrast | Acute setting when stroke or hemorrhage suspected; when MRI not available or contraindicated | Rapidly available; excellent for hemorrhage; identifies large infarcts | Poor sensitivity for posterior fossa (brainstem and cerebellum due to bone artifact); misses early ischemic stroke; does not visualize labyrinth |
| MRI brain without contrast | Acute vestibular syndrome with concern for stroke; unexplained progressive or atypical symptoms; neurological deficits | Superior posterior fossa imaging; detects ischemic stroke, demyelination, tumors | May miss acute stroke in first 24-48 hours (up to 20% false negative in first 48 hours); does not exclude benign causes |
| MRI with gadolinium (internal auditory canal protocol) | Suspected vestibular schwannoma; asymmetric sensorineural hearing loss; suspected cerebellopontine angle pathology | Gold standard for vestibular schwannoma detection; visualizes cranial nerve VIII | Specific indication required; not a screening test for dizziness |
| CT temporal bone (high resolution) | Suspected superior semicircular canal dehiscence; cholesteatoma with labyrinthine involvement; temporal bone trauma | Excellent bony detail; identifies canal dehiscence | Does not image soft tissue or vascular structures |
| MRA or CTA of head and neck | Suspected vertebral artery dissection; vertebrobasilar insufficiency workup | Visualizes vertebral and basilar arteries; identifies dissection | Complementary to brain imaging; not a standalone dizziness investigation |
Critical Point: MRI Sensitivity in Acute Stroke
In the first 24-48 hours of posterior circulation stroke, MRI (including diffusion-weighted imaging) can be falsely negative in up to 20% of cases. A negative early MRI does not exclude stroke in a patient with a concerning HINTS examination or other red flags. If clinical suspicion is high, admit for observation and repeat imaging, or proceed directly with vascular imaging and stroke workup.
Audiological Testing
| Test | Indications | What It Shows | Clinical Utility |
|---|---|---|---|
| Pure tone audiometry | Any vestibular disorder with hearing symptoms; suspected Ménière disease; asymmetric hearing loss | Hearing thresholds by frequency; type of hearing loss (conductive vs sensorineural); asymmetry | Essential for Ménière disease diagnosis (low-frequency sensorineural hearing loss); asymmetry greater than 15 dB warrants MRI to exclude schwannoma |
| Tympanometry | Suspected middle ear pathology; conductive hearing loss | Middle ear pressure and compliance; tympanic membrane mobility | Identifies effusion, perforation, ossicular discontinuity |
| Electrocochleography | Suspected Ménière disease with equivocal audiometry | Summating potential to action potential ratio; elevated in endolymphatic hydrops | Supports Ménière diagnosis when ratio greater than 0.4-0.5 |
| Auditory brainstem response | Suspected retrocochlear pathology; vestibular schwannoma screening | Neural conduction time through auditory pathway | Prolonged latencies suggest retrocochlear lesion; largely replaced by MRI for schwannoma detection |
Vestibular Function Testing
| Test | Indications | What It Measures | Interpretation |
|---|---|---|---|
| Videonystagmography or Electronystagmography | Chronic dizziness workup; suspected vestibular hypofunction; pre-surgical evaluation | Spontaneous, positional, and caloric-induced nystagmus; smooth pursuit and saccades | Unilateral weakness greater than 20-25% on caloric testing indicates vestibular hypofunction; helps localize lesion |
| Video head impulse test | Quantify vestibulo-ocular reflex function; bilateral vestibulopathy assessment | Vestibulo-ocular reflex gain for each semicircular canal | Gain less than 0.7-0.8 indicates hypofunction; identifies specific canal involvement |
| Vestibular evoked myogenic potentials | Superior semicircular canal dehiscence; vestibular schwannoma; Ménière disease | Otolith organ and vestibular nerve function via muscle reflexes | Enhanced amplitude in superior canal dehiscence; reduced or absent in vestibular nerve lesions |
| Rotary chair testing | Bilateral vestibular loss assessment; compensation evaluation | Vestibulo-ocular reflex response to rotation at various frequencies | Evaluates both labyrinths simultaneously; assesses central compensation |
| Posturography | Balance assessment; vestibular rehabilitation planning; medicolegal evaluation | Postural stability under varying sensory conditions | Identifies sensory system reliance; documents functional impairment; may detect non-physiological patterns |
Cardiac Evaluation (When Presyncope Suspected)
First-Line Tests
- 12-lead electrocardiogram: Arrhythmia, conduction disease, QT prolongation, pre-excitation, ischemia
- Orthostatic vital signs: Blood pressure and heart rate supine and standing
- Echocardiogram: If murmur present, suspected structural heart disease, or exertional symptoms
Extended Monitoring
- Holter monitor (24-48 hours): Frequent symptoms; captures rhythm during episodes
- Event recorder (weeks to months): Infrequent episodes; patient-activated or auto-triggered
- Implantable loop recorder: Very infrequent, unexplained syncope or presyncope
- Tilt table testing: Recurrent unexplained syncope; suspected vasovagal mechanism
Targeted Investigations by Suspected Diagnosis
If Suspecting Posterior Circulation Stroke
Immediate Tests
- CT head: To exclude hemorrhage (low sensitivity for posterior fossa ischemia)
- MRI brain with diffusion-weighted imaging: Most sensitive for ischemia; may be false negative early
- CTA or MRA head and neck: Evaluate vertebrobasilar arteries for stenosis or dissection
Stroke Workup
- Electrocardiogram: Atrial fibrillation or other source of cardioembolism
- Echocardiogram: Cardiac source of embolism
- Lipid panel, hemoglobin A1c: Vascular risk factors
- Hypercoagulability workup: If young patient or no traditional risk factors
If Suspecting Ménière Disease
First-Line Tests
- Audiometry: Low-frequency sensorineural hearing loss; fluctuation between attacks
- MRI brain with internal auditory canal protocol: Exclude vestibular schwannoma or other structural cause
Confirmatory Tests
- Electrocochleography: Elevated summating potential to action potential ratio supports diagnosis
- Vestibular function testing: May show unilateral vestibular hypofunction
- Serial audiometry: Documents fluctuating and progressive hearing loss
If Suspecting Vestibular Schwannoma
- MRI with gadolinium (internal auditory canal protocol): Gold standard; detects tumors as small as 2-3 mm
- Audiometry: Usually shows asymmetric high-frequency sensorineural hearing loss; poor word recognition disproportionate to pure tone loss
- Auditory brainstem response: Prolonged wave I-V latency; less sensitive than MRI
Empiric Treatment Trials as Diagnostic Tools
Response to Treatment Supports Diagnosis
When clinical features suggest a specific diagnosis but diagnostic testing is limited or equivocal, response to targeted treatment can confirm the diagnosis:
- Epley maneuver for suspected benign paroxysmal positional vertigo: Resolution after repositioning maneuver confirms posterior canal benign paroxysmal positional vertigo
- Migraine prophylaxis for suspected vestibular migraine: Reduction in episode frequency with beta-blocker, topiramate, or amitriptyline supports diagnosis
- Sodium restriction and diuretics for suspected Ménière disease: Reduction in attack frequency supports diagnosis
- Selective serotonin reuptake inhibitors for suspected persistent postural-perceptual dizziness: Gradual improvement over 8-12 weeks supports diagnosis
- Medication discontinuation: Resolution of dizziness after stopping a suspected causative medication confirms drug-induced etiology
7. Pattern Recognition and Clinical Decision-Making
Practical algorithms and decision pathways for dizziness and vertigo
Step 1: Is This Urgent?
| Clinical Scenario | Urgency Level | Immediate Action |
|---|---|---|
| Acute vertigo with focal neurological deficits (diplopia, dysarthria, dysphagia, weakness, numbness, ataxia) | EMERGENT | Activate stroke protocol; CT head to exclude hemorrhage; consider thrombolysis if ischemic stroke within window; urgent neurology consultation |
| Acute vertigo with severe headache or decreasing level of consciousness | EMERGENT | CT head immediately to exclude cerebellar hemorrhage; neurosurgical consultation if hemorrhage confirmed (risk of herniation) |
| Acute vestibular syndrome with “central” HINTS (normal head impulse test, direction-changing nystagmus, or skew deviation) | EMERGENT | High suspicion for posterior circulation stroke; MRI brain (may be falsely negative early); admit for stroke workup even if MRI negative |
| Syncope or near-syncope with exertion or associated chest pain | EMERGENT | ECG, troponin, echocardiogram; evaluate for aortic stenosis, hypertrophic cardiomyopathy, arrhythmia, acute coronary syndrome |
| Acute vertigo with fever and headache | URGENT | Evaluate for meningitis or cerebellar abscess; consider lumbar puncture after imaging; empiric antibiotics if meningitis suspected |
| Acute vestibular syndrome with “peripheral” HINTS and no risk factors | URGENT | Likely vestibular neuritis; supportive care; short-term vestibular suppressants; early vestibular rehabilitation; close follow-up |
| Acute vertigo with sudden hearing loss | URGENT | Evaluate for labyrinthitis versus anterior inferior cerebellar artery stroke; audiometry; MRI if stroke suspected; consider steroids for sudden sensorineural hearing loss |
| Classic benign paroxysmal positional vertigo with positive Dix-Hallpike | ROUTINE | Epley maneuver; no imaging needed if classic presentation; follow-up if symptoms persist |
| Episodic vertigo with typical migraine features | ROUTINE | Treat acute episode; initiate migraine prophylaxis if frequent; lifestyle modification; outpatient neurology referral if refractory |
| Chronic dizziness without red flags | ROUTINE | Comprehensive history and examination; medication review; consider persistent postural-perceptual dizziness; vestibular rehabilitation referral |
Step 2: Classify by Timing and Triggers
Acute Continuous (hours to days)
→ Proceed to Acute Vestibular Syndrome Algorithm
Key question: Is this peripheral or central?
Episodic Recurrent
→ Proceed to Episodic Vertigo Algorithm
Key question: Triggered or spontaneous?
Chronic Persistent (weeks to months)
→ Proceed to Chronic Dizziness Algorithm
Key question: Vestibular, psychiatric, or multifactorial?
Step 3A: Acute Vestibular Syndrome Algorithm
| Clinical Scenario | Most Likely Diagnosis | Action |
|---|---|---|
| Acute vertigo + abnormal head impulse test + unidirectional nystagmus + no skew + no neurological deficits + no vascular risk factors | Vestibular neuritis | Supportive care; short-term antiemetics and vestibular suppressants (24-72 hours maximum); early mobilization; vestibular rehabilitation; corticosteroids may hasten recovery if started within 72 hours |
| Acute vertigo + hearing loss or tinnitus + abnormal head impulse test + peripheral nystagmus pattern | Labyrinthitis | As above plus audiometry; if bacterial source suspected (otitis media), urgent ENT consultation and antibiotics; consider steroids for hearing recovery |
| Acute vertigo + normal head impulse test OR direction-changing nystagmus OR skew deviation | Posterior circulation stroke until proven otherwise | MRI brain with diffusion-weighted imaging (may be falsely negative early); if high suspicion and negative MRI, admit for observation and repeat imaging; stroke workup |
| Acute vertigo + severe headache + hypertension + severe ataxia (cannot sit or walk) | Cerebellar hemorrhage | CT head immediately; neurosurgical consultation; monitor for deterioration (risk of brainstem compression) |
| Acute vertigo + vesicles in ear canal + facial weakness | Ramsay Hunt syndrome (herpes zoster oticus) | Acyclovir or valacyclovir plus corticosteroids; facial nerve protection; ENT consultation |
Step 3B: Episodic Vertigo Algorithm
| Clinical Scenario | Most Likely Diagnosis | Action |
|---|---|---|
| Brief vertigo (seconds to less than 1 minute) triggered by specific head positions + positive Dix-Hallpike with latency and fatigability | Benign paroxysmal positional vertigo (posterior canal) | Epley maneuver (canalith repositioning); may repeat; no medications needed; educate about recurrence (30-50% within 5 years) |
| Brief vertigo triggered by lying flat + horizontal nystagmus on supine roll test | Benign paroxysmal positional vertigo (horizontal canal) | Barbecue roll maneuver or Gufoni maneuver; geotropic versus apogeotropic pattern determines specific treatment |
| Lightheadedness on standing + positive orthostatic vital signs + symptoms reproduced | Orthostatic hypotension | Review medications; hydration; compression stockings; fludrocortisone or midodrine if refractory; evaluate for underlying cause (autonomic neuropathy, adrenal insufficiency) |
| Episodic vertigo (20 minutes to 12 hours) + fluctuating hearing loss + tinnitus + aural fullness | Ménière disease | Audiometry (document hearing loss); sodium restriction; thiazide diuretic; betahistine; intratympanic therapy if refractory; ENT referral |
| Episodic vertigo (minutes to days) + migraine history or migraine features during attack | Vestibular migraine | Acute treatment: triptans, antiemetics; prophylaxis: beta-blockers, topiramate, amitriptyline, venlafaxine; lifestyle modification; neurology referral if refractory |
| Presyncope + palpitations + ECG abnormality | Cardiac arrhythmia | Holter monitor or event recorder; echocardiogram if structural disease suspected; cardiology referral; treatment depends on rhythm |
| Brief vertigo or presyncope + vascular risk factors + posterior circulation symptoms | Vertebrobasilar transient ischemic attack | MRI brain; MRA or CTA head and neck; stroke workup; antiplatelet therapy; risk factor modification; isolated vertigo as TIA is rare—look for other symptoms |
Step 3C: Chronic Dizziness Algorithm
| Clinical Scenario | Most Likely Diagnosis | Action |
|---|---|---|
| Chronic dizziness (3 months or more) + worsened by upright posture, motion, and complex visual environments + follows acute vestibular event | Persistent postural-perceptual dizziness | Vestibular rehabilitation (habituation exercises); selective serotonin reuptake inhibitors (sertraline or escitalopram, titrate slowly); cognitive behavioral therapy; education about condition |
| Chronic dizziness + prominent anxiety or depression + no vestibular findings | Primary psychiatric dizziness | Screen with validated questionnaires (PHQ-9, GAD-7); psychiatric referral; antidepressants; cognitive behavioral therapy; may coexist with vestibular disease |
| Chronic imbalance + oscillopsia with head movement + bilateral abnormal head impulse test | Bilateral vestibulopathy | Identify cause (aminoglycosides, autoimmune, bilateral Ménière disease); vestibular rehabilitation is mainstay; no effective medication; environmental modifications |
| Chronic dizziness temporally related to medication initiation or dose change | Medication-induced dizziness | Taper or discontinue offending agent if possible; switch to alternative medication; allow time for resolution (may take weeks) |
| Progressive unilateral hearing loss + tinnitus + chronic imbalance | Vestibular schwannoma | MRI with gadolinium of internal auditory canals; neurosurgery or radiation oncology referral; management depends on size and symptoms (observation, surgery, or stereotactic radiosurgery) |
| Progressive ataxia and imbalance + nystagmus + dysarthria | Cerebellar degeneration | MRI brain; consider paraneoplastic panel; genetic testing if familial; evaluate for alcoholic cerebellar degeneration; supportive care; physical therapy |
“What Do I Do If…” Decision Reference
| Clinical Situation | Immediate Action | Next Step |
|---|---|---|
| HINTS examination suggests central cause but MRI is negative | Admit for observation; do not discharge based on negative MRI alone | Repeat MRI in 24-48 hours; MRA or CTA of posterior circulation; neurology consultation |
| Patient cannot tolerate Dix-Hallpike due to neck or back problems | Use side-lying test as alternative positional test | If positive, use modified Epley or Semont maneuver; consider ENT referral for difficult cases |
| Epley maneuver unsuccessful after multiple attempts | Confirm correct canal identified (posterior versus horizontal); ensure proper technique | Consider horizontal canal benign paroxysmal positional vertigo (supine roll test); ENT referral; Brandt-Daroff exercises at home |
| Patient has vertigo and is taking aminoglycosides | Assess vestibular function; consider stopping aminoglycoside if possible | Vestibular function testing; switch to non-ototoxic antibiotic if feasible; monitor for bilateral vestibulopathy |
| Elderly patient with dizziness on multiple medications | Comprehensive medication review; orthostatic vital signs | Deprescribe where possible; simplify regimen; fall risk assessment; gait training |
| Chronic dizziness not responding to standard treatments | Reconsider diagnosis; screen for psychiatric comorbidity | Multidisciplinary approach: neurology, ENT, vestibular physical therapy, psychiatry; consider specialized vestibular center referral |
| Patient insists on CT scan for vertigo | Explain that CT has very poor sensitivity for posterior fossa; MRI is preferred if imaging needed | If concern for stroke, proceed with MRI; if classic benign paroxysmal positional vertigo, imaging not indicated—educate patient |
Troubleshooting Refractory Dizziness
When Dizziness Does Not Improve, Ask These Questions
- Is the diagnosis correct? Reconsider the differential; could this be vestibular migraine rather than Ménière disease? Could there be an undiagnosed central cause?
- Are there multiple overlapping causes? Chronic dizziness is often multifactorial—benign paroxysmal positional vertigo plus anxiety plus medication effects
- Is there psychiatric comorbidity? Anxiety and depression are extremely common with chronic vestibular disorders and may require specific treatment
- Is the patient still taking vestibular suppressants? Chronic use impairs central compensation; taper and discontinue
- Has vestibular rehabilitation been tried? First-line for most chronic vestibular conditions; ensure adequate duration and compliance
- Are expectations realistic? Some patients will have residual symptoms; focus on function and quality of life
- Is secondary gain present? Consider litigation, disability claims; does not exclude genuine symptoms
8. Clinical Pearls and Pitfalls
Practical wisdom — learn from successes and avoid common mistakes
Must-Know Clinical Pearls
Timing and triggers trump symptom quality: Asking “What type of dizziness is it?” is less useful than asking “How long do episodes last?” and “What brings it on?” The TiTrATE approach (Timing, Triggers, And Targeted Examination) dramatically improves diagnostic accuracy.
A normal head impulse test in acute vestibular syndrome is dangerous: Peripheral vestibular lesions cause an abnormal head impulse test. A normal result suggests the peripheral apparatus is intact—meaning the problem is central (brainstem or cerebellum). This is the most important single finding in the HINTS examination.
Benign paroxysmal positional vertigo is the most common cause of vertigo: It accounts for approximately 20-40% of all vertigo cases. If brief positional vertigo is described, always perform the Dix-Hallpike maneuver—it is both diagnostic and therapeutic (when followed by repositioning).
The “inability to walk” test for cerebellar stroke: Patients with vestibular neuritis can walk (though unsteadily). Patients with cerebellar stroke often cannot walk or even sit unsupported. Severe truncal ataxia out of proportion to limb ataxia strongly suggests cerebellar involvement.
Vestibular migraine is underdiagnosed: It is the second most common cause of vertigo and the most common cause of spontaneous episodic vertigo. Vertigo can occur without headache. Ask about migraine history and migraine features (photophobia, phonophobia) during episodes.
Stop vestibular suppressants early: Meclizine, dimenhydrinate, and benzodiazepines should be used for a maximum of 48-72 hours. Prolonged use impairs central compensation and perpetuates dizziness. Encourage early mobilization instead.
Persistent postural-perceptual dizziness is a real disorder: Formerly called chronic subjective dizziness or phobic postural vertigo, this functional vestibular disorder often follows an acute vestibular event. It responds to vestibular rehabilitation and selective serotonin reuptake inhibitors—not vestibular suppressants.
Check orthostatic vital signs in every dizzy patient: Orthostatic hypotension is common, especially in the elderly and those on antihypertensives. It is easily diagnosed at the bedside and often treatable.
Critical Pitfalls to Avoid
Trusting a negative early MRI in acute vestibular syndrome: MRI with diffusion-weighted imaging can be falsely negative in up to 20% of posterior circulation strokes in the first 24-48 hours. If clinical suspicion is high (abnormal HINTS suggesting central cause), do not discharge based on a negative MRI—admit and repeat imaging.
Using CT to “rule out stroke” in vertigo: CT has extremely poor sensitivity for posterior fossa ischemia due to bone artifact. A normal CT does not exclude cerebellar or brainstem stroke. If imaging is needed to exclude stroke, order MRI.
Labeling all dizziness as “vertigo” or all vertigo as “benign paroxysmal positional vertigo”: Dizziness is a nonspecific term encompassing vertigo, presyncope, disequilibrium, and lightheadedness—each with different differentials. Not all positional dizziness is benign paroxysmal positional vertigo; central positional vertigo exists and has different nystagmus characteristics.
Performing HINTS in episodic or chronic dizziness: The HINTS examination is validated only for acute vestibular syndrome (acute continuous vertigo lasting hours to days). It should not be applied to patients with brief episodic vertigo or chronic dizziness—the findings are not interpretable in these contexts.
Assuming isolated vertigo cannot be a transient ischemic attack: While isolated vertigo as a transient ischemic attack is rare, it can occur. In patients with vascular risk factors and brief episodes of vertigo (especially with other posterior circulation symptoms), vertebrobasilar transient ischemic attack must be considered.
Ignoring psychiatric comorbidity: Anxiety and depression are highly prevalent in patients with chronic dizziness—both as a cause and a consequence. Failing to screen for and treat psychiatric comorbidity leads to treatment failure and persistent symptoms.
Prescribing long-term vestibular suppressants: Meclizine and similar medications provide symptomatic relief but impair the brain’s natural compensation process. Patients become dependent on the medication and never fully recover. Limit use to 48-72 hours maximum.
Forgetting to ask about medications: Many common medications cause dizziness. Always perform a thorough medication review, especially in elderly patients on polypharmacy. Antihypertensives, sedatives, and aminoglycosides are frequent culprits.
Key Takeaways
- Classify dizziness by timing (acute continuous, episodic, chronic) and triggers (positional, orthostatic, spontaneous) rather than symptom quality—this approach has superior diagnostic accuracy.
- In acute vestibular syndrome, the HINTS examination (Head Impulse, Nystagmus, Test of Skew) performed by an experienced examiner is more sensitive for stroke than early MRI. A “central” HINTS pattern demands urgent evaluation.
- Benign paroxysmal positional vertigo is the most common cause of vertigo. Diagnose with Dix-Hallpike maneuver; treat with Epley maneuver. No imaging or medications are needed for classic presentations.
- Vestibular migraine is commonly missed. It can present with vertigo without headache. Ask about migraine history and features during attacks.
- Posterior circulation stroke can mimic vestibular neuritis. Red flags include: normal head impulse test, direction-changing nystagmus, skew deviation, inability to walk, and any focal neurological deficits.
- MRI can be falsely negative for posterior circulation stroke in the first 24-48 hours. Clinical suspicion should override a negative early MRI.
- Vestibular suppressants should be used for a maximum of 48-72 hours. Prolonged use impairs compensation and perpetuates symptoms.
- Vestibular rehabilitation is the cornerstone of treatment for most chronic vestibular disorders, including persistent postural-perceptual dizziness and incomplete compensation.
- Orthostatic hypotension is a common and easily diagnosed cause of dizziness. Check orthostatic vital signs in all patients presenting with dizziness.
- Chronic dizziness is often multifactorial. Look for overlapping causes and address psychiatric comorbidity.
Quick Reference Algorithm
Systematic Approach to Dizziness:
- Assess for emergent conditions: Focal neurological deficits? Severe headache? Unable to walk? Syncope with exertion? → Urgent workup
- Classify by timing: Acute continuous (hours-days)? Episodic (seconds-minutes-hours)? Chronic (weeks-months)?
- Identify triggers: Positional? Orthostatic? Spontaneous? Visual or auditory triggers?
- Perform targeted examination: Acute vestibular syndrome → HINTS; Positional → Dix-Hallpike; Orthostatic → Vital signs; All patients → Neurological and otological examination
- Reach working diagnosis: Most vestibular diagnoses are clinical. Investigations confirm or exclude specific conditions.
- Treat and follow up: Specific treatment for diagnosis; vestibular rehabilitation for most chronic conditions; limit vestibular suppressants; address psychiatric comorbidity