Symptom duration · 9 min read
How Long Do Concussion Symptoms Last?
How long do concussion symptoms last? Here's the honest shape of the answer: most people recover within a few weeks, a meaningful minority take longer, and nobody — not a clinician, not a website, not us — can tell you in advance how long yours will last. Any page that puts a date on your individual recovery is guessing.
What can be given honestly are the population numbers: the two- and four-week thresholds at which symptoms earn the label "persisting", the share of adults and children who cross them, and the one approach a randomized trial has shown to shorten recovery. Those numbers describe groups, not you.
They do something else useful, though. They tell you when waiting is still reasonable — and when waiting has quietly stopped being a plan.
How long do concussion symptoms usually last?
Concussion symptoms are conventionally called "persisting" when they run beyond two weeks in adults and beyond four weeks in children — thresholds that exist because most recovery happens inside them. Among children and adolescents specifically, up to 30% have symptoms lasting four weeks or longer, which means the large majority don't.
Those are the anchor numbers, and everything else on this page hangs off them. Here is every duration figure we can trace to evidence, in one grid:
| Duration marker | Who it applies to | The number |
|---|---|---|
| Median recovery with early aerobic exercise, in one randomized trial | Adolescents | 13 days, versus 17 days in the stretching comparison group |
| Symptoms become "persisting" | Adults | Beyond 2 weeks |
| Symptoms become "persisting" | Children and adolescents | Beyond 4 weeks — a mark up to 30% reach |
| Post-traumatic headache is renamed from "acute" to "persistent" | Anyone with headache after a head injury | At 3 months |
| Symptoms still present beyond a year | Adults | 10 to 15% |
Read each row as a population fact, not a forecast. A median means half of that trial's participants took longer. A threshold marks the day a clinician's language changes, not a deadline your brain has agreed to. What the grid is genuinely good for is orientation: knowing whether you're inside the ordinary window, at its edge, or past it — because what you should do next is different in each case.
When is a symptom that won't settle an emergency?
Get emergency care immediately if a headache keeps getting worse and does not go away, or if the person loses consciousness, looks very drowsy or cannot be woken up — these are CDC danger signs, and they apply however long ago the injury happened. In babies and children the CDC adds two more: crying that will not stop and cannot be consoled, and refusing to nurse or eat.
Duration is exactly what makes these easy to miss. A headache that has been there for six weeks becomes background noise, so the change — worse, different, no longer responding to what used to help — gets rationalised away. Keep the distinction sharp: a symptom that has plateaued is a reason to book an appointment. A symptom that is escalating is a reason for the emergency department, whether it's day two or week six.
Is recovery from a "mild" concussion faster?
"Mild" is the injury's clinical category, not a schedule — the CDC describes mild TBI and concussion together as one group, and the persisting thresholds don't move because the impact seemed minor. The same two-week and four-week lines apply to a mild concussion as to any other.
This matters because "mild" quietly installs a private deadline. People hear the word, give themselves a week, and then treat day eight as evidence that something has gone wrong. Nothing in the definitions supports that deadline. The label describes the class of injury, and the duration figures above already are the figures for that class. What "mild" does and doesn't mean — for symptoms, scans and treatment — has its own page: our guide to mild concussion symptoms and treatment.
How the injury looked at the time is weak evidence too — symptoms don't all arrive at the moment of impact, and a person who seemed fine can develop them later. That's the start-date question rather than the duration question, and we've answered it separately in our guide to how long after hitting your head symptoms can start.
When does the length of symptoms itself become the red flag?
Once symptoms pass the persisting threshold — two weeks for an adult, four for a child — the reasonable move changes from waiting to assessment. Crossing that line isn't a diagnosis of something worse; it's the signal that watchful waiting has done its job and finished.
A 2024 perspective on the Amsterdam consensus conference records those definitions — over two weeks in adults, over four in children — and the point of them is practical. Before the threshold, time itself is still a plausible treatment. After it, the useful question changes shape: not "how long do concussion symptoms last?" but "which specific problem is keeping mine going, and who examines for it?"
If you're past the line for your age group, the framework your clinician will be working from is persisting post-concussive symptoms — post-concussion syndrome — and our guide to it covers the assessment and treatment side in detail. The short version: it is common, it is taken seriously, and it is not a verdict.
What makes concussion symptoms last longer?
Age is the best-documented factor in the sources we can verify: children and adolescents are given twice the adult window, and the pediatric consensus paper puts persisting symptoms at up to 30% of them. Beyond age, much of what separates short recoveries from long ones is whether the specific problems driving the symptoms are found and treated.
Persisting symptoms are rarely one mysterious condition. Guideline syntheses describe concussion care as interdisciplinary treatment tailored to a patient's symptom profile — vestibular, vision-oculomotor, behavioral health and cognitive rehabilitation, in whatever mix the examination points to. Vision is a concrete example of how specific the drivers get: in one 2024 study, about one in five patients with post-concussion syndrome had symptomatic convergence insufficiency — eyes that no longer team properly at reading distance. A problem like that doesn't resolve because enough weeks pass. It resolves when someone finds it.
You'll see longer risk-factor lists elsewhere — prior concussions, migraine history, and more. Some of those may well be real. They aren't in the sources we can verify, so we won't put numbers on them.
What actually shortens concussion recovery?
Early, light, symptom-limited activity — not strict rest. In a 2019 randomized trial, adolescents prescribed aerobic exercise below their symptom threshold recovered in a median of 13 days, against 17 days for a stretching program, and consensus guidance now supports light activity in the first day or two.
Hold that trial result at its correct size. It's a real, randomized difference — four days at the median — and it's a population result, not a promise: half of each group took longer than its median. What it establishes is direction. Activity kept below the level that flares symptoms pushes recovery the right way, and the old instruction to sit in a dark room until you feel normal is gone from the guidance. The current consensus states that people can return to light-intensity physical activity during the initial 24–48 hours after a concussion.
"Below the symptom threshold" is doing the heavy lifting in that sentence, and it's measurable rather than guessed. The Buffalo Concussion Treadmill Test identifies the heart rate threshold of exercise tolerance in concussed patients — it comes from a separate line of research and wasn't the test used in the 13-versus-17-day trial, but it's how a clinician hands you a heart rate number instead of "take it easy". How activity builds back from there, step by step, is covered in our guide to the stages of concussion recovery, so we won't repeat the ladder here.
Do children's symptoms last longer than adults'?
Children get twice the adult window before symptoms count as persisting — four weeks rather than two — and up to 30% of children and adolescents have symptoms lasting four weeks or longer. A month of symptoms in a teenager is the far edge of common, not an emergency in itself.
What surprises families is that a longer symptom duration does not mean a longer absence from life. The CDC's position is that most children can return to school within 1 to 2 days of a concussion — with adjustments like shorter days, reduced workload and extra breaks doing the work. A child can be back in the classroom while symptoms run their course. Those two clocks are separate, and treating them as one is how children end up isolated at home for weeks longer than they need to be.
Younger children add a harder problem: they can't always tell you what hurts, which makes "are the symptoms still there?" a genuinely difficult question. We've written separately about spotting concussion signs in kids and toddlers, where the observation has to do the talking.
How long does a concussion headache last?
Under the international headache classification, headache attributed to head trauma is considered acute for the first three months and persistent beyond that. The three-month line changes what the headache is called and how it's approached — it doesn't predict when yours will stop.
That renaming is more useful than it sounds. A headache that crosses three months becomes a recognised headache condition that can be treated by people who treat headache, rather than staying filed under "still recovering". If headache is your dominant symptom, our guide to headache treatment after concussion covers what that care looks like — and it's worth knowing the field is thinner than you'd expect. Across the 3,205 listings in our directory, 305 clinics list headache and migraine care, roughly one in ten.
Can concussion symptoms last a year or more?
Yes — 10 to 15 percent of adults have symptoms that persist for more than a year. Hold that number in both directions: long recoveries are common enough that nobody should treat yours as strange, and 85 to 90 percent of people are not in that group.
A year of symptoms is also not a verdict of permanence. The problems that keep symptoms going — balance, vision, neck, sleep, mood, exercise tolerance — are found by examination, and nothing in the evidence we can cite puts an expiry date on being examined. The one thing worth actively distrusting is the opposite move: a clinic quoting you a recovery date for a condition it hasn't assessed isn't being honest with you, at month one or at year two.
When should you stop waiting and see someone?
If you're an adult still limited by symptoms at two weeks, or it's your child at four weeks, arrange an assessment — and go sooner if symptoms are getting worse rather than staying flat. Past the threshold, the useful question is no longer "will this pass?" but "which system is misbehaving, and who tests it?"
Which clinician that means depends on which symptoms dominate — dizziness points somewhere different from reading strain, and both point somewhere different from headache. If you can't name the specialty you need, that's normal, and it's exactly what our two-minute specialist quiz is for: it matches your symptoms to a specialist type and shows verified providers near you.
The care exists to be found. Across the 3,205 listings in our directory, 1,117 describe multidisciplinary concussion programs and 1,413 list return-to-play and return-to-learn services across 44 states — assessing a recovery that has run past its window is one of the more widely available parts of concussion care. You can browse verified concussion clinics by state and city directly. Every listing is free, verified against the provider's own website, and never ranked or filtered by sponsorship.
And if you take one thing from this page, take the two clocks. Symptoms on their own set the pace of your recovery. Symptoms past two weeks in an adult, four in a child — or getting worse at any point — set the date of your next appointment.
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).
Not sure which kind of specialist your symptoms point to? Take the 2-minute specialist quiz →
Frequently asked questions
How long does a mild concussion last in adults?
There is no separate, faster clock for a "mild" concussion — concussion is grouped with mild traumatic brain injury, and adult symptoms are labelled persisting once they run beyond two weeks. Most adults recover within weeks, while 10 to 15 percent have symptoms lasting more than a year, and no one can predict an individual's duration in advance.
Can concussion symptoms last for months?
Yes. Up to 30% of children and adolescents have symptoms lasting four weeks or longer, 10 to 15 percent of adults have symptoms beyond a year, and post-traumatic headache is classified as acute for its first three months and persistent after that. Symptoms lasting months are a reason for assessment, not proof of permanent damage.
Does exercise really make concussion symptoms go away faster?
In a 2019 randomized trial, adolescents prescribed early aerobic exercise kept below their symptom threshold recovered in a median of 13 days, versus 17 days for a stretching program. That is a trial result across a group, not a guarantee for any individual, and the exercise threshold should be set clinically — for example with the Buffalo Concussion Treadmill Test — rather than guessed.
Is it normal for a child to still have concussion symptoms after a month?
It is common: up to 30% of children and adolescents have symptoms lasting four weeks or longer, which is also the point at which pediatric symptoms are labelled persisting and an assessment is warranted. Separately, most children can return to school within 1 to 2 days of a concussion with adjustments, so lasting symptoms do not have to mean weeks out of the classroom.
Is it normal to still have concussion symptoms a year after the injury?
A minority of adults — 10 to 15 percent — have symptoms that persist for more than a year, so it is uncommon but far from rare. It is not a verdict of permanence: the specific problems that keep symptoms going are found by examination, and the evidence sets no expiry date on being assessed.
How do I know if my concussion symptoms are lasting too long?
Symptoms are conventionally called persisting when they run beyond two weeks in adults or beyond four weeks in children, and crossing that threshold is the signal to move from waiting to a clinical assessment. Separately, a headache that keeps getting worse and does not go away, extreme drowsiness or an inability to be woken are CDC danger signs that need emergency care at any point.
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.