The disorder
Clinical features
BPPV announces itself by a pattern, not a single symptom: brief vertigo triggered by a change in head position, after a short delay, fading on repetition, and never with hearing loss. Recognise the pattern and the diagnosis is half made.
The pattern
The vertigo is short — usually under a minute — and is set off by particular movements: lying down or sitting up in bed, rolling over, looking up, or bending forward. It can be intense and bring nausea, but it settles quickly. There is no hearing loss or ringing in the ears.
Episodes are brief (seconds to under a minute), provoked by head movement relative to gravity, and often accompanied by nausea or imbalance. Crucially, BPPV is free of cochlear symptoms— no hearing loss, tinnitus or aural fullness — which separates it from Ménière’s disease and labyrinthitis.2
The diagnostic criteria require recurrent positional vertigo provoked by lying down or turning in the supine position, with the characteristic positional nystagmus on testing.1 The patient is typically asymptomatic between provocations; chronic, constant imbalance should make you question the diagnosis or look for a second pathology.
Latency and fatigability — the signatures
Two features anchor the bedside diagnosis and separate peripheral BPPV from central mimics:
- Latency — a 1–5 second delay between reaching the provocative position and the onset of vertigo and nystagmus, equal to the time free otoconia take to start moving.3
- Fatigability — the response wanes on repeated positioning as the debris disperses or the response habituates.
A central positional nystagmus, by contrast, typically has no latency, does not fatigue, and may be pure downbeat or direction-changing — a pattern that should prompt imaging rather than repositioning.
Between and after episodes
Many patients — especially the elderly — describe a vaguer disequilibrium or unsteadiness for hours to days after an attack, thought to reflect residual vestibular asymmetry. This is a major driver of fear of falling and activity limitation, and is part of why "benign" BPPV is far from trivial in older people. Atypical presentations (multi-canal, post-traumatic, superimposed vestibular hypofunction) may report ill-defined imbalance rather than clear positional vertigo unless specifically provoked.
Key points
- Brief (<1 min), position-triggered vertigo — often with nausea, never with hearing loss or tinnitus.
- Latency (1–5 s) and fatigability are the peripheral signatures.
- Patients are usually well between provocations; constant imbalance suggests another diagnosis.
- Post-episode disequilibrium is common in the elderly and drives fall risk.