It usually announces itself at 3 a.m. You roll over in bed and the room lurches into a spin, violent, brief, and frightening the first time it happens. Sitting up sets it off again. So does looking up at a high shelf, or bending to tie a shoe. Then it stops, as suddenly as it started, until the next position change. That pattern, spins lasting under a minute, triggered by specific head movements, is the signature of BPPV, the single most common cause of vertigo.
What is actually happening
Deep in the inner ear sit tiny calcium crystals (otoconia) that belong in one chamber, where they sense gravity. In BPPV, some crystals escape into one of the semicircular canals, tubes that sense head rotation. Now, when your head moves in that canal’s plane, the loose crystals drift, dragging fluid with them and sending a false “we are spinning” signal to the brain. Your eyes even flicker in a characteristic pattern (nystagmus) that a clinician can observe. It is, unusually for medicine, a plumbing problem, and plumbing problems have mechanical solutions.
Why it happens: often no reason at all; sometimes after a head knock, a long bed rest, or an inner-ear illness. It becomes more common with age.
The treatment: putting the crystals back
The clinical practice guideline for BPPV (American Academy of Otolaryngology, 2017 update) is unusually decisive: clinicians should treat posterior-canal BPPV with a canalith repositioning procedure, the Epley manoeuvre is the best known, and should not routinely offer the medications (like meclizine) that suppress the vestibular system, because they do not fix the problem and can slow compensation. The manoeuvre is a guided sequence of head and body positions that uses gravity to walk the crystals back where they belong. For the common form, published success rates after one or two treatments run high, many people are spin-free within a visit or two.
Diagnosis comes first, though: positional testing (the Dix-Hallpike manoeuvre) confirms which ear and which canal, because the treatment direction differs, and because other conditions can imitate BPPV. That is the assessment’s job, along with ruling out the presentations that should not be treated with manoeuvres at all.
Variants, and why one treatment sometimes is not enough
The posterior canal is involved in the large majority of cases, but crystals occasionally end up in the horizontal or anterior canals, which produce different eye-movement patterns and need different manoeuvres, one reason a confirmed diagnosis matters before treatment. Sometimes the crystals also need more than one pass: a manoeuvre that helps for a day and then wears off usually means some crystals were moved but not all, and repeating the sequence (in a visit, or at home once you have been taught) finishes the job. A small number of people have crystals stuck against the canal’s sensor (cupulolithiasis), which responds to modified techniques. None of this is failure, it is the normal texture of treating a mechanical problem in a three-dimensional structure you cannot see directly.
What to expect afterwards
A day or two of mild wooziness after successful treatment is common and settles. BPPV can recur, estimates suggest a meaningful chance over the following years, but recurrence is not an emergency; it is the same fix again. Some people are also taught a home version of the manoeuvre, once the diagnosis is certain and they have been shown properly.
Not all spinning is BPPV: get urgent care for
- Vertigo with double vision, slurred speech, facial droop, or limb weakness or numbness
- Continuous vertigo lasting hours with vomiting and inability to walk steadily
- A sudden hearing loss in one ear
- Severe new headache, or vertigo after a significant head injury
These can signal stroke or other serious causes and need emergency assessment, not an appointment.
References
- Bhattacharyya N, Gubbels SP, Schwartz SR, et al. Clinical Practice Guideline: Benign Paroxysmal Positional Vertigo (Update). Otolaryngology–Head and Neck Surgery. 2017;156(3 Suppl):S1–S47. doi:10.1177/0194599816689667
General information only, not medical advice. Vertigo should be assessed in person before treatment; the red flags above mean emergency care.