Persistent Postural-Perceptual Dizziness (PPPD)

The Condition Nobody Seems to Have Heard Of

PPPD is a chronic form of dizziness that is remarkably common and yet almost unknown to the people who have it. You can be dizzy for months, sometimes years. You go for test after test, and nothing is found. So often a doctor will turn round and effectively say, look, there is nothing wrong with you, there is nothing wrong with your ears, you are not really dizzy. That is one of the most disheartening things a person can be told, because they know perfectly well that they are dizzy.

The name is a mouthful. Persistent Postural-Perceptual Dizziness, or PPPD for short (usually said as “three-P-D”). It was formally defined in 2017 by the Bárány Society, the international body for balance disorders, which finally gave a single clear name to something clinicians had been describing under half a dozen older labels for decades.^[1][2] And it turns out to be one of the most common causes of chronic dizziness we see. In specialist dizziness clinics it is frequently the single most common diagnosis of all. A recent review of patients at University College London Hospitals found PPPD to be the commonest cause of dizziness overall, and the commonest cause of long-standing dizziness in the clinic.^[3] It is, quite simply, everywhere, and most people have never heard of it.

What It Actually Feels Like

The typical story is very recognisable once you have seen a few hundred of these patients. People struggle in places with a lot of visual information. You could be walking down a supermarket aisle, with all the colours and the movement and the stacked shelves, and you find it genuinely hard to cope. You might be going up an escalator in a shopping centre and get a wave of confusion about where you are. You could be standing at the roadside waiting to cross, with cars moving left and right, and that alone is enough to set you off. Even scrolling on your phone or your laptop, that gentle up-and-down movement on the screen, can make you feel as though you are falling forwards or tipping backwards.

None of this should happen. And the truly maddening part, the thing that leads to all the disbelief, is that it does not show up on any balance test. The vestibular tests are normal. The scans are normal. On paper you are completely fine. Researchers even have a name for this now, the “subjective-objective dissociation”, the gap between how disabled a person feels and how normal all their measurements look.^[4] So let me try to explain why that gap exists, because once you understand it, the whole thing stops being frightening.

Three Balance Systems, and a Brain That Checks They Agree

To understand PPPD you need to know that your balance depends on three separate systems.

Your ears, the inner ear balance organs, are mostly there to tell you where you are and how you are moving, particularly when your eyes are closed. Your eyes work out where the horizon is, what is moving around you, and where you can safely put yourself. And your legs, through the sensation in your joints and muscles, tell you where your body is in space, so that if you start to lean one way you can correct before you topple.

All three feed into the brain, and the brain’s job is simply to check that they agree. When the three roughly match up, the brain decides you are balanced and you never give it a second thought. This continuous cross-checking is happening every second of your life, silently, in the background.

The modern research describes exactly this, in slightly grander language. Brain imaging studies of people with PPPD show altered activity and connectivity in the multisensory areas that weigh up visual and balance information, with the brain coming to lean too heavily on vision and not enough on the inner ear.^[5][6][7] That is the scientific version of what I am about to describe in plain terms.

How It Usually Starts

PPPD almost never comes out of nowhere. It usually starts with something else first, some initial event that genuinely upsets your balance.

That first event is commonly something like a vestibular neuritis or labyrinthitis, where the balance nerve is knocked out for a while by a virus. It might be BPPV, the condition where loose crystals in the inner ear cause violent spinning for a few seconds when you roll over in bed. It might be an attack of vestibular migraine. It might be a blow to the head. Any of these can cause a horrible bout of vertigo. The large studies confirm that these are the usual triggers, with BPPV and vestibular migraine among the commonest precipitants.^[8][9] It can also follow a head injury, which is increasingly recognised, though people with PPPD after a head injury sometimes respond a little less predictably to treatment.^[10]

Now, here is the key idea. Remember that the brain is, in the end, a piece of flesh sitting inside a bony box. It has no direct knowledge of the outside world. It cannot see that you have had a migraine. It has no idea you have been hit on the head. All it knows is what its three sensors tell it. And during that first awful episode, the legs are reporting normally, the eyes are reporting normally, but the ear is sending nonsense. You are falling around, you feel sick, you might be vomiting, and you end up in A&E feeling genuinely dreadful.

The brain, sensibly, concludes that something is wrong. Two of my three systems agree, it reasons, and this third one, the ear, is giving me rubbish. And the brain does something rather clever. It reprogrammes itself on the spot. It decides to stop listening to the ear, and to rely on the eyes and the legs instead. That way it can get you back on your feet.

And it works. After three or four days of misery you can start to get up, the vomiting stops, and you begin to get on with life. In that acute phase it is a brilliant piece of adaptation.

Why the Brain Gets Stuck

The problem is what happens next. The brain has had a terrible fright, and it does not want you to go through that again. So it keeps ignoring the ear long after the ear has recovered. It leaves the volume on the ear turned right down, permanently, just in case.

This is the heart of PPPD, and it is worth dwelling on. If you stop using one of your three balance systems, you can still get around, but you overload the two you have left. Normally the brain would glance at the ear to confirm everything is fine. Now it cannot, because it is too wary of the ear’s data, so it has to work everything out from vision and the legs alone, consciously and effortfully.

So when you walk into that busy supermarket, with the bright lights and the colours and the movement, the brain is overwhelmed. It is trying to process all of it, without the quiet reassurance from the ear that it used to rely on. You have to think hard just to walk through a train station where people are crossing in every direction. Your brain is on overload, recognising faces, working out where you are going, and also doing all the balance work the ear used to do for free.

And because it is such hard work, it exhausts you. People come back from a simple trip to the shop for milk and cornflakes and they are completely wiped out. From the outside it looks trivial. For them it was enormous, because they had to use so much of their brain just to stay upright.

The same overload happens through the legs. Walking on sand, or thick pile carpet, or across a pebbled drive onto paving stones, things that would not trouble most of us, become a real problem. Because you are not trusting your ear, you find yourself staring at the floor, worrying that a paving slab might rock or that you might stumble. This matches what the perception research now shows. People with PPPD process complex visual motion less efficiently and become abnormally sensitive to it, which is exactly why moving, cluttered environments are so provoking.^[11][12] Their brains have shifted into a high-alert, threat-focused way of controlling posture, bracing against a fall that is not actually coming.^[7]

Why the Tests Are Normal, and Why That Is Good News

Here is why the specialist centre finds nothing. By the time you get to have all the expensive tests, the original problem, the labyrinthitis or the migraine or the concussion, has often settled. The ear has recovered. You may be in a quiet phase between attacks. So the tests, which look at whether the ear is currently working, come back completely normal.

And you are told, reassuringly, that you are not dizzy. And you say, no, I really am dizzy, stop gaslighting me. Both of you are right, in a way. The tests are right that the ear works. You are right that you are dizzy. The problem is not in the ear at all any more. The problem is that the brain is still too frightened to listen to it. There is no automatic mechanism that goes back and checks whether the ear has recovered. The brain simply keeps refusing the data, because it is scared of it.

I want to be clear that this is genuinely reassuring, not dismissive. The normal tests are the good news. They tell us the hardware is intact. Nothing is broken, no tumour has been missed, no microscopic damage is hiding from the scanner. It is a software problem, a habit the brain has fallen into, and habits can be changed.

Layers of Complexity

It is not always as tidy as one trigger that gets better. Some conditions keep causing trouble in the ear, and you can end up with PPPD stacked on top of an ongoing problem. Someone might have genuine BPPV that flares now and again, and PPPD as well. Or vestibular migraine that keeps returning, and PPPD on top. You get layer upon layer, and that is exactly why it can be so hard for doctors to tease it all apart.

There is another layer too, which the research is very clear about. Fear. The brain is frightened, and so are you. If you cannot manage the supermarket, or even walking across your own drive, you start to lose confidence. Your world contracts. You stop going out, you stop socialising, you retreat to the places where you feel safe, usually your own home. It becomes genuinely disabling. Studies confirm that anxiety and low mood are extremely common alongside PPPD, present in the large majority of patients, and that longer illness makes the handicap and the anxiety worse.^[13][14][15] It is important to understand the direction here. For most people the anxiety is not the cause. It is the consequence of a frightening, unexplained, exhausting problem, and it then feeds back and makes the dizziness worse.

Treatment: Four Things That Work Together

The genuinely good news is that PPPD responds well to treatment. I think about it as four separate areas, and most people need more than one.

1. Education

The first is education, which is exactly what this article is. I explain what is going on and why. This matters more than it sounds. Once you understand that your brain has simply got stuck ignoring a healthy ear, that nothing sinister has been missed, the fear starts to drain away. And since the fear is part of what keeps the whole thing going, that understanding is itself part of the treatment. The research bears this out. Studies repeatedly find that a clear, structured explanation of the diagnosis improves how well people engage with everything else and improves their outcomes.^[4][16] Understanding it is not a preamble to treatment. It is treatment.

2. Retraining the Brain to Trust the Ear

The second area is the hard part, and the core of it. You have to coax the brain into listening to the ear again. We know from all the testing that the ear works and the balance system is intact. It is just being ignored. So through a set of graded exercises, we gently reintroduce the ear, in a slow, unthreatening way, so the brain does not take fright and shut it down again. You expose yourself, little by little, to the movement and the busy visual environments that provoke you, until the brain relearns that the ear’s information is safe and useful after all.

This is vestibular rehabilitation, and it is the cornerstone treatment for PPPD. The evidence is now reasonably solid. A 2025 systematic review and meta-analysis found that vestibular rehabilitation produced a moderate-to-large improvement in dizziness,^[17] and other reviews and studies agree, with benefits that are largely maintained months after the programme ends.^[18][19] There is also promising work on rehabilitation that is deliberately combined with psychological techniques, so-called cognitively-informed vestibular rehabilitation, which in an early London-based trial showed encouraging advantages over standard rehabilitation alone.^[20] This is also why I built the free Visual Motion Trainer on this website, which offers graded moving patterns to practise with at home.

3. Treating the Fear

The third area is dealing with the anxiety and the fear that come with all this. Remember, these people have been through a frightening experience, their world has shrunk, and they have lost confidence. Sometimes that needs direct help. Cognitive behavioural therapy, or CBT, is the best studied approach, and it works. Studies show CBT produces meaningful reductions in both dizziness and anxiety in PPPD.^[21][22] It helps take the brain out of that constant fight-or-flight state, so it stops over-reacting to every small movement. Some people do also have a genuine underlying depression or anxiety disorder that needs treating in its own right, and that is worth addressing properly rather than pretending it is not there.

This is also where medication comes in. Certain antidepressants, specifically the serotonin-based ones, the SSRIs such as sertraline and the related SNRIs, are a recognised treatment for PPPD, and they seem to work on the dizziness itself and not only on any low mood.^[23][24] Response rates in the region of two-thirds are reported, and the benefit appears to hold up over the longer term.^[25][26] I should be honest about the evidence, though. A Cochrane review pointed out that we still do not have large, gold-standard placebo-controlled trials of these drugs specifically for PPPD, so although clinical experience and the studies we do have are encouraging, the highest tier of proof is still missing.^[27] Side effects, mostly a bit of nausea in the first fortnight, are common but usually settle, and starting at a low dose helps.^[24] There is decent evidence that combining an SSRI with rehabilitation, or with CBT, works better than any single approach on its own.^[22][28] In practice, that combination is what I usually aim for.

4. Treating Everything That Keeps Dragging You Back

The fourth area is thinking about all the other things that keep pulling you back into PPPD. If you keep having migraine attacks, then each one can throw you straight back to square one. Just as you are pushing yourself to get out again, another attack comes, the fear rushes back, and the brain concludes it was right not to trust the ear all along. So you have to treat the underlying condition. If there is ongoing BPPV, those few seconds of spinning every time you roll over can be enough to keep the whole cycle going, and it is often fixed with a few simple repositioning movements of the head. Deal with the trigger and you stop it relighting the fire.

And you have to look at the person as a whole, especially as they get older. Someone might be off balance for several reasons at once. Their eyesight may have declined and they simply need glasses, so they can lean on vision more confidently. They may have arthritis in the hips and knees, undermining trust in their legs. Think about the older person getting up in the night for the toilet. They get out of bed too quickly and feel light-headed, they hurry because they are worried about an accident, they cannot see well in the dark so they have lost the horizon, they are walking on thick carpet, and their knees hurt. No wonder the elderly have more trouble with dizziness and falls. Often the answer is not medical at all. Low-level lighting along the floor, automatic lights in the corridor, thinner carpet or an easier floor surface, a banister for support. Sometimes, once they are out of the situation and their confidence returns, they do not need any of it. But it is there just in case, and it gives them their confidence back.

The Honest Summary

PPPD is common, it is genuinely disabling, and for years it was dismissed as being all in the mind. It is not. It is a real and now well-defined disorder in which a brain, having been frightened by a bout of vertigo, gets stuck ignoring a perfectly healthy inner ear, and then has to work so hard on vision and the legs that busy, moving environments overwhelm and exhaust it. The tests are normal because the hardware is fine. The problem is a software habit, and habits can be retrained.

The treatment is not a single magic bullet. It is education, so you understand and stop being afraid; rehabilitation, to coax the brain back into trusting the ear; help with the fear, through CBT and sometimes an SSRI; and dealing with everything else that keeps triggering it. Put together, and given a bit of patience, most people get substantially better. If you have been told there is nothing wrong with you and yet you know you are dizzy, this may well be what has been happening, and it is very much treatable.

Frequently Asked Questions

References

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This page is patient education and does not replace individual medical assessment. If your dizziness is new, sudden, one-sided, or accompanied by neurological symptoms, please see a doctor.