You roll over in bed and the room spins violently. It lasts perhaps twenty seconds, then stops. You lie still, terrified to move. It happens again looking up at a high shelf, or lying back at the dentist.
That very specific pattern, intense but brief spinning triggered by a change in head position, is almost always benign paroxysmal positional vertigo. It is common, it is not dangerous, and it is one of the few conditions in the whole of physiotherapy that can genuinely be resolved in one or two appointments.
Many people live with it for months without knowing that.
What is actually happening
Deep in your inner ear are three fluid-filled loops set at right angles to each other, the semicircular canals. They detect rotation of your head. Beside them sits a structure containing tiny calcium carbonate crystals, which detect gravity and straight line movement.
Sometimes crystals come loose and drift into one of the canals, where they do not belong.
Now, when you move your head, the crystals move through the fluid and drag it with them, which tells that canal you are spinning. Your other ear and your eyes report that you are not. The mismatch is experienced as violent rotation.
This is a plumbing problem, not a brain problem. The crystals are in the wrong tube. Moving them back out is a mechanical procedure, which is why it works so quickly and so reliably.
Does this sound like yours?
- Brief. Seconds to under a minute, not hours
- Triggered by position, particularly rolling over in bed, lying down, sitting up, looking up, or bending forwards
- Rotational. The room spins, rather than a vague lightheadedness
- Settles when you stay still
- Often worse in the morning, and it can cluster over several days
- Frequently nausea, sometimes vomiting if severe
- Some people feel unsteady and foggy between attacks
Two things it should NOT include: hearing loss or ringing in one ear, and any neurological symptoms. Those point elsewhere.
What it is not
| Condition | How it differs |
|---|---|
| Vestibular neuritis | Severe constant spinning for days, not seconds, often after a virus |
| Meniere's disease | Vertigo lasting hours, with hearing loss, fullness and ringing in one ear |
| Vestibular migraine | Often longer, with headache, light or sound sensitivity, visual aura |
| Cervicogenic dizziness | Unsteadiness related to neck movement and neck pain rather than true spinning |
| Low blood pressure on standing | Lightheaded and grey, on standing only, not rotational |
| Central causes | Double vision, slurred speech, weakness, numbness, severe headache, difficulty walking |
That last row is the one that matters. Vertigo accompanied by any neurological symptom needs urgent medical assessment the same day, not a physiotherapy appointment.
How it gets diagnosed
Not by a scan. By a positioning test.
The Dix-Hallpike manoeuvre involves turning your head to one side and lying you back quickly with your head slightly extended. If crystals are in the posterior canal on that side, it provokes brief vertigo along with a very characteristic eye movement called nystagmus.
The eye movement is the diagnosis. Its direction and timing indicate which canal is involved, which then determines which repositioning manoeuvre is used. This is why guessing at home from a video rarely works: you cannot see your own eyes.
How it gets treated
Repositioning manoeuvres. The best known is the Epley, a sequence of head and body positions that walks the crystals around the canal and back out into the chamber they came from.
The numbers here are unusual in musculoskeletal practice. Around eighty percent of people are resolved after a single manoeuvre, and the large majority after two or three. Other manoeuvres exist for the less common canals, notably the Lempert roll for the horizontal canal.
It is a strange appointment: it briefly provokes the exact symptom you came in to avoid, and then it is over. Most people feel unsteady for a day or two afterwards while the system recalibrates.
Afterwards
- Expect some residual wobbliness and mild fogginess for a few days. That is normal
- If it recurs, and it does in perhaps one in three people within a year, it is treatable again
- Balance work is worth doing where you have become cautious, particularly for older adults. Our balance and falls prevention set covers that, and it matters more than it sounds: a bout of vertigo that leaves someone afraid to move quickly is a genuine falls risk, as covered in our guide to falls prevention
- Vitamin D deficiency is associated with recurrence, and correcting it appears to reduce it
Why it is worth getting looked at
People manage this for months by simply never lying on one side, sleeping propped up, and avoiding looking up. That is a substantial reduction in quality of life for something that is usually fixed in a single visit.
It is also frequently misattributed. Older adults in particular get told it is their blood pressure, their age, or their neck, when a two minute positioning test would have identified it.
Get it assessed urgently if
Dizziness comes with any of: severe headache unlike your usual, double vision, slurred speech, weakness or numbness anywhere, difficulty walking or coordinating, new deafness or ringing in one ear, or a very severe episode that does not settle at all when you stay still. Those need same-day medical assessment.
Otherwise, if the room spins for less than a minute every time you roll over in bed, that is a recognisable pattern with a mechanical fix, and there is little reason to keep living around it.