Benign paroxysmal positional vertigo

01OverviewDefinition, clinical context and the essential points that orientate the chapter.

Benign paroxysmal positional vertigo arises when otoconia enter a semicircular canal and make it respond abnormally to gravity. A person may feel well sitting still, then experience a brief intense spin when rolling in bed, lying back, looking up or bending. Each typical posterior-canal episode lasts seconds, usually less than a minute after the position is reached. The patient may describe a longer period because nausea, anxiety or mild disequilibrium persists after the actual spinning stops.

The diagnosis is supported by the relationship between position, symptoms and observed nystagmus. It should not be made solely because dizziness worsens with head movement. Posterior-canal disease is common, but horizontal-canal and multicanal disease require different interpretation and treatment. BPPV may follow head injury or another vestibular illness and can coexist with migraine, hearing loss or neurological disease. A successful manoeuvre treats the positional component; it does not automatically explain every remaining symptom.

Key points

BPPV causes short attacks initiated by changes in head position.
The posterior semicircular canal is most commonly affected.
Hallpike testing should reproduce the appropriate positional nystagmus pattern.
Treat confirmed posterior-canal disease with a trained canalith repositioning manoeuvre.
Identify the affected side and assess cervical movement safety before treatment.
Vestibular suppressants do not move the displaced particles or cure BPPV.
Residual unsteadiness and recurrence need explanation and a review plan.

02AetiologyUnderlying causes, associations and risk factors, with why each one matters.

Otoconial displacement

Calcium carbonate particles normally associated with the utricle can become displaced into a semicircular canal, where gravity-dependent movement triggers inappropriate vestibular stimulation.

Predisposing circumstances

BPPV can arise without a clear precipitant or after head trauma and vestibular illness. Age-related changes may make otoconial detachment more likely.

03PathophysiologyThe causal sequence from the underlying abnormality to symptoms and harm.

1
Canalith movement
Free particles move after a change in head orientation, displacing endolymph and deflecting the cupula until they settle within the canal.
2
Position-specific eye movements
The stimulated canal drives an eye-movement response in its anatomical plane. This relationship allows observed nystagmus to help identify the affected canal.
3
Mechanical repositioning
A sequence of carefully chosen positions guides particles away from the affected canal towards the vestibule, reducing inappropriate stimulation during subsequent movements.

04Clinical features and red flagsSymptoms, examination findings, patterns of presentation and time-critical warnings.

A reproducible positional history

Ask which movement starts the episode, whether the person is already dizzy before moving and how quickly the spinning stops when still. Rolling towards one side in bed is a useful clue, but the symptomatic side must be confirmed rather than inferred from history alone.

Posterior-canal response

On correctly performed Hallpike testing, posterior-canal BPPV typically produces a brief upbeat torsional nystagmus after a short latency, together with the familiar vertigo. The torsional component is directed towards the dependent affected ear. The examiner should observe the eyes rather than record symptoms alone.

Horizontal-canal possibility

A history compatible with BPPV with horizontal nystagmus or an uninformative Hallpike test may require a supine roll test by an appropriately trained clinician. Direction and relative intensity distinguish patterns; repeatedly performing a posterior-canal Epley without localisation may be ineffective.

Features outside uncomplicated BPPV

New deafness, focal neurological signs, persistent spontaneous vertigo or severe interictal truncal instability need another explanation. Downbeat or sustained atypical positional nystagmus raises central concern, although rare peripheral variants exist and require expertise.

Functional effect in older adults

Some older patients emphasise falls, nausea or unsteadiness instead of spinning. Ask about getting out of bed and reaching high shelves. Frailty, visual impairment and fear of falling can magnify disability from a relatively short positional event.

Red flags requiring action

Persistent vertical or otherwise atypical positional nystagmus, new diplopia or inability to sit or walk safely should prompt assessment for central disease.
Unstable cervical spine disease requires an alternative specialist pathway instead of a standard head-hanging repositioning manoeuvre.

05InvestigationsWhat to request, why it matters and how to interpret it.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
Trained Hallpike examinationFirst step
Why
Confirm a posterior-canal pattern while assessing the symptomatic side.
Interpretation and limitations
Explain the expected transient vertigo, obtain agreement and assess neck and back limitations. Observe latency, direction and duration of nystagmus on each clinically appropriate side. Symptoms without the expected eye findings require interpretation, repeat assessment or referral rather than automatic certainty.
02
Supine roll assessment when indicated
Why
Investigate suspected horizontal-canal disease when the initial positional pattern differs.
Interpretation and limitations
A trained examiner evaluates horizontal nystagmus with head turns in the supine position. Geotropic and apogeotropic patterns have different localisation rules. The result determines the appropriate manoeuvre and is not interchangeable with a posterior-canal Hallpike response.
03
Neurological examination and hearing assessment
Why
Look for accompanying abnormalities that a simple canal disorder cannot explain.
Interpretation and limitations
Check eye movements, facial and limb function, coordination and safe gait. Ask about unilateral hearing change and arrange audiometry when indicated. A normal brief neurological screen reduces concern but does not make persistent atypical nystagmus irrelevant.
04
Selective imaging or specialist vestibular testing
Why
Investigate atypical findings, treatment failure or a competing diagnosis.
Interpretation and limitations
Routine brain imaging is unnecessary for a convincing uncomplicated BPPV presentation. Central signs, an unusual positional pattern or unexplained persistent symptoms warrant specialist assessment and appropriately targeted imaging. Scanning does not demonstrate ordinary mobile otoconia in clinical practice.

06Differential diagnosisRealistic alternatives and the features that help distinguish them.

Acute vestibular neuritis

Neuritis usually produces continuous vertigo over hours or days, worsened by movement but still present at rest, rather than isolated brief positional attacks.

Central positional vertigo

Cerebellar or brainstem disease may generate positional nystagmus with unusual direction, persistence or associated neurological findings, requiring investigation beyond routine canal treatment.

Orthostatic dizziness

Symptoms occur on standing because of haemodynamic change rather than head orientation alone. A careful sequence of events helps distinguish rising from rolling.

07ManagementImmediate care, first-line treatment, alternatives and escalation.

01ConfirmedPosterior-canal repositioning treatmentFirst stepA compatible history and positional response identify posterior-canal BPPV.

1Check consent, cervical stability and practical ability to transfer safely before a trained clinician performs the manoeuvre.
2Use an Epley or other appropriately selected canalith repositioning procedure for the identified side, explaining that transient vertigo and nausea may occur.
3Allow the person to recover sitting safely and assess balance before leaving; arrange assistance home when treatment leaves them unsteady.
4Provide a recurrence plan and review if symptoms persist rather than prescribing repeated courses of vestibular suppressants.

02RestrictedMovement limitations or uncertain canalStandard positioning is unsafe or the nystagmus pattern does not identify ordinary posterior-canal disease.

1Avoid forcing neck extension in unstable cervical disease and refer through the local specialist balance or physiotherapy pathway.
2Describe the exact observed nystagmus, mobility restriction and previous attempted manoeuvres so that adapted testing can be planned.
3AlternativeUse a clinician-taught alternative or home programme only after the relevant side, movement safety and practical support have been assessed.

03PersistentSymptoms after an initial manoeuvrePositional attacks continue or a different balance complaint remains after treatment.

1Clarify whether the original brief spin persists or has been replaced by milder non-positional disequilibrium.
2Reassess for unresolved BPPV, a different canal, recurrent disease or a separate vestibular or neurological disorder.
3EscalationEscalate new hearing or neurological symptoms promptly, and offer rehabilitation when persistent balance impairment remains after appropriate positional treatment.

08ComplicationsImportant consequences, why they occur and why they matter clinically.

Falls during transfers

A sudden spin while rising from bed or looking upward can cause loss of balance, especially when vision, strength or protective reactions are impaired.

Avoidance and neck stiffness

Fear of triggering an attack may lead to rigid head posture and reduced activity, adding musculoskeletal discomfort and deconditioning to the vestibular symptoms.

Residual disequilibrium

Some people remain mildly unsteady after positional spinning resolves. Persistent impairment warrants reassessment for incomplete recovery, another vestibular deficit or non-vestibular contributors.

09Monitoring and follow-upTreatment response, safety checks and longer-term review.

Record which canal and side were treated, the diagnostic eye findings, tolerance of the manoeuvre and the immediate functional response.
Arrange review for unresolved symptoms; the international BPPV guideline recommends reassessment within one month after initial treatment or observation.
Explain that brief post-treatment nausea or unsteadiness can occur; the person should not drive home while affected or resume hazardous work until safe.
Review recurrent episodes on their current features. Previous BPPV makes recurrence plausible but does not exclude a new cause of dizziness.

10Special situationsVariants, exceptions and circumstances that change the usual approach.

Home treatment needs preparation

Home Epley instructions should be side-specific and demonstrated rather than handed out indiscriminately. A patient needs sufficient mobility, a safe bed or surface and knowledge of when to stop. Significant cervical disease or uncertain diagnosis favours supervised assessment.

Activity after repositioning

Routine prolonged upright sleeping or cervical immobilisation is not required after successful posterior-canal repositioning. Usual activity can resume as tolerated, with sensible precautions for transient imbalance. Individual movement advice may still be necessary for another musculoskeletal condition.

A negative first test

Intermittent disease, recent spontaneous movement of particles, technique or another canal may explain a negative Hallpike test. Reconsider the timing and phenotype; a negative test is neither proof of a central lesion nor permission to disregard central warning signs.

Medication and the mechanical problem

A sedating tablet may blunt nausea yet leave canal stimulation unchanged. Routine suppressants can impair alertness and balance, particularly in older adults. If symptoms are severe enough to prevent examination, reassess the syndrome and the need for supervised treatment.

11Common pitfallsFrequent interpretation and management errors.

01
Inferring the affected ear solely from which side the patient dislikes lying on can lead to an ineffective manoeuvre.
02
Forcing a standard Epley despite unstable cervical disease ignores a specific NICE reason to use a specialist referral pathway.
03
Calling persistent dizziness treatment failure without distinguishing brief positional spinning from residual imbalance misses the need for different follow-up.
04
Assuming no further care is needed after one successful procedure overlooks recurrent symptoms, falls risk and concurrent vestibular disorders.