Persisting symptoms · 11 min read
Post-Concussion Syndrome (PCS): What It Is and What Helps
Post-concussion syndrome (PCS) — the term medicine is steadily replacing with persisting post-concussive symptoms — describes concussion symptoms that are still with you after the window in which most people recover. If you're four, six or eight weeks out and still fogged, still flinching at supermarket lighting, still unable to look at a screen for an hour without your head tightening, you are not imagining it and you are not unusual.
You have probably been told to rest and wait. That advice has moved on, and the version of it you were given — sit still until this passes — is the part that has aged worst. Persisting symptoms are now treated as several separate, assessable problems, each with its own clinician and its own approach.
This guide covers what the label means, what the numbers actually say, what a neurologist contributes and what they don't, and what real treatment looks like. What it can't do is tell you how long your own recovery will take. Nobody honest can.
What is post-concussion syndrome?
Post-concussion syndrome, usually shortened to PCS, is the label for a cluster of symptoms — headache, mental fog, dizziness, visual strain, fatigue, sleep disruption, irritability and low mood — that continue past the point at which a concussion was expected to settle. It is increasingly called persisting post-concussive symptoms, because that name describes what is happening without implying a single, separate disease. On a chart or an insurance claim the same cluster is recorded as the ICD-10 code for post-concussion syndrome (F07.81), which is often the first place people encounter the diagnosis in writing.
The change in wording matters more than it looks. "Syndrome" suggests one condition with one cause, and that framing sent a generation of patients looking for the one test that would find it. The current view is closer to the opposite: what persists is usually a handful of ordinary, identifiable problems — a balance system that hasn't recalibrated, eyes that no longer team properly at reading distance, a neck injured in the same impact, disrupted sleep, an exercise tolerance that has collapsed. The injury itself now has formal criteria too; the American Congress of Rehabilitation Medicine published diagnostic criteria for mild traumatic brain injury in 2023. Our breakdown of concussion symptoms goes through them one by one.
When do symptoms count as persisting?
Symptoms are generally described as persisting once they last beyond two weeks in adults and beyond four weeks in children. Those thresholds are a prompt to escalate care — they are not a diagnosis of something permanent.
A 2024 perspective on the Amsterdam consensus conference notes that persisting symptoms were previously defined as those lasting over two weeks in adults and over four weeks in children. The field is drifting away from treating that as a hard line, and for good reason: the date on the calendar tells you almost nothing about which system is misbehaving. What the threshold is useful for is deciding when watchful waiting stops being reasonable. Past it, the question is no longer whether to be assessed but by whom. Our guide to the stages of concussion recovery covers what the earlier part of that timeline should look like.
When do these symptoms mean emergency care?
Go to an emergency department if a headache gets worse and does not go away, or if someone loses consciousness, looks very drowsy or cannot be woken up. These are CDC danger signs, and they apply whether the injury was yesterday or three months ago.
This matters in the chronic phase precisely because a slow, stable headache becomes background noise. A headache that changes — worse, different, no longer responding to what used to touch it — is not something to note down for your next appointment in three weeks. The CDC's list of danger signs after a brain injury also includes additional signs in children: a child who will not stop crying and is inconsolable, or who will not nurse or eat, needs to be seen.
How common is post-concussion syndrome?
Up to 30% of children and adolescents have symptoms lasting four weeks or longer, and 10–15% of adults still have symptoms beyond a year. Persisting symptoms are common enough that no one should be treated as an outlier for having them.
The pediatric figure comes from the pediatric companion paper to the Amsterdam consensus statement; the adult figure from StatPearls on the NIH Bookshelf, which puts it at a minority of patients, 10 to 15 percent, with symptoms persisting more than a year.
Read those numbers in both directions. They confirm you are far from alone, and they describe populations rather than people — neither figure predicts what happens to you. What they are useful for is the conversation where someone implies that still having symptoms at week seven is strange. It isn't.
Why do symptoms persist when the scan is normal?
A normal CT or MRI does not mean nothing is wrong. Standard imaging looks for structural damage such as bleeding or a fracture, and a concussion is a functional injury that does not usually produce either.
This is also why the scan often shouldn't have been the first step. The American Family Physician summary of the CDC mild TBI guideline states that head CT should not be routinely performed to assess patients with mild TBI. A normal result is the expected result — and being told "your scan is clear" with nothing following it is one of the more demoralising moments in this process.
The problems that do explain persisting symptoms are found on examination rather than on film. Vestibular function, eye movement and convergence, neck mechanics, exertion tolerance, sleep and mood are each assessed by hand, in a room, by someone who knows what to test. Vision is a good example of how specific this gets: in one 2024 study, about one in five patients with post-concussion syndrome had symptomatic convergence insufficiency — the eyes failing to work together at close range, which reads to the patient as headaches and exhaustion after twenty minutes of reading, not as an eye problem at all.
What can a neurologist do for post-concussion syndrome?
A neurologist can confirm the picture, exclude other neurological causes for your symptoms, judge whether any imaging is warranted, and manage post-traumatic headache — the area where medication has the most to contribute. What a neurologist typically does not provide is the hands-on rehabilitation, and that is where most of the recovery work is actually done.
That division is worth understanding before you book, because a great deal of frustration comes from expecting the wrong thing from the right doctor. Neurology is the correct place to go if the question is "is this something else?" — and that question deserves a proper answer, not reassurance. It is also where headache is taken seriously as its own problem. The International Headache Society's classification of headache attributed to trauma to the head or neck treats it as acute during the first three months from onset and persistent beyond that — a genuine clinical distinction, not semantics. Our guide to treating headache after concussion covers what that changes.
Where neurology has less to offer is the pharmacy shelf. No drug is approved for concussion recovery itself; NINDS describes drug treatment after brain injury in terms of targeting individual symptoms, and a 2024 review in the Primary Care Companion for CNS Disorders notes there are no FDA-approved medications for impaired attention and concentration after TBI. Prescribing here is symptom-targeted and largely off-label. That's how the field works — but it means medication manages a symptom while something else does the rehabilitation.
It's also worth knowing how thin the ground is. Across the 3,205 listings in our directory, 108 are neurology practices and 305 clinics list headache and migraine care — roughly one in ten. Neurology is not the default door into concussion care in most of the country.
Who else should you be seeing?
Most people with persisting symptoms need a rehabilitation team rather than a single physician, typically some combination of vestibular therapy, vision care, graded exercise, neuropsychology and headache management. Which of those you need depends entirely on which symptoms dominate, which is why the assessment matters more than the referral.
| If this dominates | Who generally does the work | Listings in our directory |
|---|---|---|
| Dizziness, imbalance, motion sensitivity | Vestibular and balance therapy | 1,067 |
| Screen intolerance, reading strain, eyes not teaming | Vision and neuro-optometry | 401 |
| Memory, attention, work or school demands | Neuropsychology and cognitive rehabilitation | 926 |
| Headache and migraine | Headache and migraine care | 305 |
| Exertion intolerance, deconditioning, neck pain | Physical therapy | 1,151 |
| Several of the above at once | Multidisciplinary concussion programs | 1,115 |
Two things fall out of our own count that are worth planning around. Vision care is the thinnest widely-needed service in the country — 401 listings against 1,067 offering vestibular work — so it's the one most likely to involve travel. And only 184 listings in our directory offer vision and vestibular care in the same place: if both apply to you, and they often do together, you're looking at two appointments and two clinics, not one. The 1,115 multidisciplinary programs are the exception, which is why it's worth checking for one before assembling a team yourself.
If you're not sure which column you fall into, our two-minute specialist quiz narrows it down from your symptoms, and you can browse verified clinics by state and service from there.
What does post-concussion syndrome treatment look like?
Treatment is interdisciplinary and matched to your symptom profile rather than delivered as a single protocol. In practice that means vestibular, vision-oculomotor, behavioral health and cognitive rehabilitation interventions, combined in whatever proportion your assessment points to.
That is close to a direct quote from the synthesis of concussion practice guidelines in Archives of Physical Medicine and Rehabilitation, which describes interdisciplinary treatment individually tailored to a patient's symptom profile. It explains why two people with the same diagnosis get entirely different plans — and why a plan consisting only of rest is not a plan.
What the evidence supports, with honest limits:
- Vestibular and cervical rehabilitation. A randomized trial of cervicovestibular physiotherapy found 73% of participants medically cleared within 8 weeks of starting treatment, against 7% of controls. That is a striking difference, and it came from 29 participants — a small trial, and worth reading as encouraging rather than settled.
- Early vestibular, visual and cervical work together. A 2023 systematic review of vestibular rehabilitation after concussion found that adding visual interventions and cervical manual therapy to early rehabilitation significantly reduced symptoms and time to return to sport.
- Graded exertion. Structured exercise kept below the level that provokes symptoms is standard, and the threshold is measured rather than guessed — the Buffalo Concussion Treadmill Test identifies the heart rate at which exercise tolerance breaks down. Our guide to physical therapy for concussion covers what those sessions actually involve.
- Cognitive behavioral therapy. A 2022 systematic review of treatments for post-concussion symptoms found CBT and graded return to physical activity showed some effectiveness on persistent symptoms. Note the wording — some effectiveness. This is not a field of dramatic results.
- Vision therapy. For one specific problem, this moved from plausible to demonstrated: the CONCUSS randomized trial found immediate vergence therapy left 88% of participants successful or improved against 8% with delayed treatment for concussion-related convergence insufficiency — one eye-teaming problem, not vision symptoms at large. Ask what a vision program is targeting and how progress will be measured; our guide to concussion eye tests explains how that problem is found in the first place.
Notice what isn't on that list: anything that claims to fix everything at once. Our broader overview of concussion treatment covers the earlier phase, where the goals are different.
Can post-concussion syndrome persist or appear years later?
Yes, symptoms can persist for years — 10–15% of adults have them beyond a year, which is uncommon but far from rare. Symptoms that appear years later with a symptom-free gap in between are a different situation, and are a reason to be assessed for another cause rather than assumed to be the old concussion.
People searching for post-concussion syndrome years later usually want to know whether it's too late for treatment to be worth trying. Nothing in the evidence base sets an expiry date on assessment — the vestibular, visual, cervical and headache problems described above are found by examination, and an examination can be done at any point. What the evidence cannot do is tell you how you personally will respond, and any clinic that gives you a recovery date for a condition it hasn't assessed is selling something.
Headache is the symptom that most often outlasts everything else. Under the international classification, post-traumatic headache is acute during the first three months and persistent after that — and persistent post-traumatic headache is a recognized entity in its own right. That matters practically: it can be treated as a headache disorder, by someone who treats headache disorders, rather than left in a folder marked "concussion".
How is post-concussion syndrome diagnosed and coded?
Diagnosis is clinical — history, a structured symptom scale and a targeted physical examination — because no scan or blood test confirms it. On your paperwork it usually appears as ICD-10 code F07.81, "Postconcussional syndrome", which explicitly excludes a current concussion.
The symptom scale you'll most often meet is the Post-Concussion Symptom Scale, a list of 22 symptoms each rated from 0 to 6. It looks crude on paper. It is genuinely useful, because it turns "I feel awful" into a number that can be tracked across appointments, and because it forces attention onto symptoms you may have stopped mentioning.
The coding side is worth knowing because it affects insurance authorisation and time off work. F07.81 in the ICD-10-CM index carries a "code first the underlying physiological condition" instruction and an Excludes1 note for current concussion (brain) — which means it is not interchangeable with the acute injury code, S06.0X0A for concussion without loss of consciousness. Getting the wrong one on a claim is a common and fixable reason for a denial. We've written up the detail in our guide to the F07.81 code and how it's applied.
What should you do next?
If you're weeks out and still symptomatic, the useful next step is an assessment that tests systems rather than another appointment that reassures you. Work out which symptoms dominate, find a clinician who treats that specific thing, and ask what they'll measure.
Our directory is free, carries no ranking or sponsorship in its listings, and covers all 50 states and DC. You can find concussion clinicians near you by state, city and service. If you're told again that the only thing left is to wait, that's a reason to seek another opinion — not a verdict.
Find a concussion specialist near you
Search 3,205 verified concussion clinics and specialists across all 50 states — filter by services like vestibular therapy, vision therapy, and neuropsychology.
Browse the largest state directories: California (148) · South Carolina (136) · Pennsylvania (125).
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Frequently asked questions
What does PCS stand for after a concussion?
PCS stands for post-concussion syndrome — concussion symptoms that are still present after the window in which most people recover. You will see the same situation written three ways: a clinician may say PCS, a chart or claim records it as F07.81, and recent consensus papers call it persisting post-concussive symptoms. All three describe symptoms that have outlasted the expected recovery timeline, not a separate disease.
What's the difference between post-concussion syndrome and persisting post-concussive symptoms?
They describe the same situation, and the second term is steadily replacing the first. "Syndrome" implies one condition with one cause, while persisting post-concussive symptoms describes what is usually happening — several separate, assessable problems overlapping after the same injury. The change in wording is deliberate, because it points toward assessment rather than toward a single missing test.
Is post-concussion syndrome permanent?
For most people it isn't: StatPearls puts the proportion of adults with symptoms lasting more than a year at 10 to 15 percent, which means the large majority no longer have them by that point. That said, no one can give you a timeline for your own recovery, and any clinic that offers one before assessing you is guessing. What can be said is that assessment has no expiry date.
Should you see a neurologist or a rehabilitation therapist first?
It depends on what the dominant symptom is. Neurology is the right first stop when the question is whether something other than the concussion is going on, or when headache is the main problem; vestibular, vision and exertion symptoms are usually addressed by rehabilitation clinicians instead. Our two-minute specialist quiz sorts this by symptom rather than by guesswork.
Is exercise safe when symptoms have persisted for weeks?
Structured exercise kept below the level that provokes symptoms is part of standard care rather than something to avoid, and a 2022 systematic review found graded return to physical activity showed some effectiveness on persistent post-concussion symptoms. The threshold is meant to be measured, not guessed — the Buffalo Concussion Treadmill Test identifies the heart rate at which exercise tolerance breaks down. This is something to set up with a clinician, not alone.
Can post-concussion syndrome cause anxiety or low mood?
Mood and anxiety changes are part of the recognized symptom cluster, and behavioral health is one of the treatment strands named in the concussion practice guideline synthesis in Archives of Physical Medicine and Rehabilitation. Cognitive behavioral therapy has shown some effectiveness on persisting symptoms in a 2022 systematic review. Treating mood and sleep is not a side issue — both amplify every other symptom.
Can any post-concussion care be done by telehealth?
Some of it can. Across the 3,205 listings in our directory, 521 offer telehealth, and it is far more available for neuropsychology (155 of 926 listings) than for vision therapy (40 of 401) — which makes sense, because vestibular and vision rehabilitation are hands-on. Expect the assessment and the physical rehabilitation to be in person, with follow-up and cognitive work more often remote.
Educational content only — not a substitute for professional medical advice, diagnosis, or treatment. Reviewed by Jon MacKay, PharmD, BCACP against current clinical guidance; last updated August 2026.