Post concussion syndrome after a car crash: a guide to your next steps
Learn the common terms, find the right article and plan your first week
Weeks have passed since the crash. The emergency room may have called it a mild concussion and sent you home with a sheet of instructions. Yet the headaches keep coming, and you lose the plot of a TV show halfway through.
You may have heard several names for what is going on, from post concussion syndrome to persisting symptoms. You may also have a long list of worries and no clear place to begin.
This page is the front door to the persistent concussion symptoms guide. Start with the terms and time frames below, then use the start here lists to find the article that fits your most pressing concern. Near the end you will find a plan for the next seven days and the warning signs that need care right away.
The words you will hear and what they mean
Clinics, insurers and research papers often use different names for the same problems. Knowing them helps you read your own records and ask clearer questions.
Clinicians use the term TBI, short for traumatic brain injury, for any injury that changes how the brain works [7]. Most TBIs each year are the mild kind, which most people call a concussion [7]. The American Congress of Rehabilitation Medicine (ACRM) issued a fresh set of mild TBI diagnostic rules in 2023. They were written for every age group and for sports, military and civilian injuries, which include crashes [1]. Of the 32 experts on its outside panel, 30 agreed that concussion and mild TBI can serve as the same label when brain scans are normal or not needed [1].
The word mild can mislead you. The CDC says clinicians use it because these injuries rarely threaten your life, yet the effects can still be serious [7].
Comparison compiled by Safety Behind the Wheel Foundation
Common terms and what they mean
| Term | What it means | Where you may see it |
|---|---|---|
| Concussion or mild TBI | A brain injury from a bump, blow or jolt, often with normal scans | ER notes, discharge papers |
| Post concussion syndrome (PCS) | The everyday name for symptoms that outlast normal recovery | Websites, conversations, claim letters |
| Persisting or prolonged symptoms | Symptoms still present after about 4 weeks or 1 month | Newer guidelines |
| Postconcussional syndrome, F07.81 | The US diagnosis code used for PCS | Medical bills, insurance forms |
| Symptoms attributed to mild TBI | Wording used by the VA and Defense Department | Military and veteran care |
| Persistent posttraumatic headache | Headache from a head injury that lasts over 3 months | Headache clinic notes |
Sources: ACRM criteria [1]; AAPC code listing [2]; Amsterdam consensus [8]; Living Concussion Guidelines [5]; VA/DoD guideline [9]; ICHD-3 [10].
Why the names keep shifting
Different groups wrote these labels at different times. An older edition of a major psychiatric manual set a 3 month clock and asked for test proof of memory or attention problems [11]. The current edition no longer lists the diagnosis at all [11]. Because each group draws the line in a different spot, studies report that anywhere from 11% to 82% of people with mild TBI have post concussion symptoms [11].
A university news release about the new rules said diagnosis had grown very inconsistent in the 30 years since ACRM’s 1993 definition [12]. The outside panel came from seven countries [12]. The new rules let blood tests and checks of thinking, balance and vision count toward a diagnosis [12].
In daily life, a code on a bill and a phrase in a guideline can describe the very same headaches and fog. The deeper PCS articles listed below cover this history in more detail.
How long symptoms usually last, and who was studied
Recovery numbers depend on who was in the study. Children, athletes and adults in different care settings recover at different speeds.
Comparison compiled by Safety Behind the Wheel Foundation
Typical recovery time by group
| Group studied | What the source reports |
|---|---|
| Adults in general | Most feel better within a couple of weeks |
| Children | Most feel better within 2 to 4 weeks |
| Athletes of all ages | Full return to sport usually within 1 month, about 20 days on average |
| Adults, Ontario guideline | Most fully recover within 1 month; 15% to 30% still have symptoms after that |
| Adults with brief or no hospital care | As many as 1 in 3 have symptoms past the 30 day mark |
| Mild TBI patients in many studies | Symptoms persist over time in 10% to 25% |
Sources: CDC [6, 13]; Amsterdam consensus [8]; Living Concussion Guidelines [3, 5]; Action Collaborative guideline [4]; Polinder et al. review [11]. Studies used different methods, so compare with care.
The Living Concussion Guidelines give two figures in different sections, 15% to 20% in one and about 20% to 30% in another [5]. The 2025 Action Collaborative guideline, written for adults who needed little or no time in the hospital, puts the share at up to 1 in 3 [4].
Some symptoms also arrive late. They can take hours or even days to appear, and mood or sleep changes may appear a week or two after the injury [6].
What makes a longer recovery more likely
The 2025 guideline lists factors linked with symptoms that last. They include a heavy load of symptoms early on, migraine, a past concussion and a mental health condition before the injury [4]. Older age is another [14]. These factors raise the odds, but they cannot tell anyone how your own recovery will go.
Imagine a 52 year old school bus driver whose car was hit from behind while she waited at a red light. By week two her neck felt better. By week six she still had afternoon headaches and could not sit through a staff meeting. She is in the group whose symptoms last past a month, so a planned follow up visit makes sense now.
Start here: articles for care and symptoms
Pick the one concern that gets in your way most this week. Read that article first, use its worksheet, then come back here for the next one. You do not need to read them all, or in order.
If something feels new, worse or frightening
Go first to New or worsening symptoms after a concussion: when to seek medical help. That article splits changes by urgency, from a 911 call to a same day call to an item for your next visit. The red flags near the end of this page are a short version.
If you are getting ready for a medical visit
- Weeks have passed and you are not sure how to describe what is still wrong: Still having symptoms weeks after a concussion? How to prepare for a follow up visit
- You want one printable sheet for symptoms, medicines, past care and questions: What to bring to a medical appointment for persistent concussion symptoms
- You are unsure who treats what, or how to ask for a referral: Who can help with persistent concussion symptoms? Understanding your care team
- Your scan came back clear, but you still feel far from well: Your scan was normal, but you still feel unwell after a crash: questions to ask next
If one symptom runs your day
- You are worn out by midafternoon: Planning your day when concussion symptoms leave you exhausted
- You miss appointments, lose your keys or lose your train of thought: Managing brain fog and forgetfulness after a car crash
- Reading, phones and computer screens bring on symptoms: When reading and screens become difficult after a concussion
- The room spins, or you feel off balance in stores: Dizziness after a concussion: preparing for evaluation and managing daily tasks
- Headaches are the main problem: Headaches after a car crash: what to record for your next appointment
- You cannot fall asleep, stay asleep or wake up rested: Sleep problems after a concussion: what to discuss with your care team
- Bright light, noise and crowds feel like too much: When light, noise, and busy places feel overwhelming after a concussion
- Your days swing between good and bad, and progress is hard to see: Good days and difficult days during concussion recovery: how to track the bigger picture
Start here: articles for daily life, feelings and family
These articles cover getting around, work, money, emotions and the people around you.
If you need to get around or get back to work
- You are wondering when you can drive again: Returning to driving after a concussion: questions to ask before you get behind the wheel
- You cannot drive yet and need rides to visits and errands: Getting to appointments and managing errands when you cannot drive
- You are planning a return to your job: Returning to work with persistent concussion symptoms
- Bills, letters and claim forms are piling up: Organizing appointments, medical bills, and insurance paperwork when you have brain fog
If feelings, family or loneliness are the hardest part
- Worry, panic or crash memories mix with your physical symptoms: Concussion symptoms and anxiety after a crash: getting help for both
- Relatives do not understand an injury they cannot see: How to explain persistent concussion symptoms to your family
- You are the partner trying to help: Supporting a partner with persistent concussion symptoms
- You are the main caregiver and running on empty: Caring for someone with persistent concussion symptoms without becoming overwhelmed
- You have children to look after while you heal: Parenting while recovering from a concussion
- Friends have drifted away and recovery feels lonely: Finding support when concussion recovery feels lonely
If you want the deeper background
Five longer articles go further into the medical, driving, claim and work sides of PCS:
- Post concussion syndrome after a car crash: what it is, how long it lasts and how it is diagnosed
- Driving with lingering concussion symptoms: a safety check before every trip
- Treating post concussion syndrome: matching care to your symptoms
- Post concussion syndrome and your injury claim: documenting an injury no one can see
- Working with post concussion syndrome: returning to your job and protecting your income
The site also has shorter pages on the first weeks after a crash concussion, headaches, dizziness, vision strain and a red flag checklist.
Worksheet from Safety Behind the Wheel Foundation
My top concerns this week
| My concern, in my own words | Article to read | One question for my care team |
|---|---|---|
Fill in up to three rows. Put the concern that limits your day the most at the top.
Your first week: a simple plan
You do not have to fix everything at once. The steps below turn what concussion guidelines ask care teams to do into small tasks you can start today.
- Book a follow up visit. The Living Concussion Guidelines advise a primary care visit 1 to 2 weeks after a concussion. They add that a referral should be considered once symptoms pass one month [3].
- Rate your symptoms. Guidelines ask clinicians to track symptoms with a standard scale at each visit until they get better or level off [5]. A daily 0 to 10 rating of your top three symptoms gives you something real to bring.
- Gather your medicines. A full assessment should include a review of your prescriptions and how you take them, along with over the counter products, supplements and any substance use [5].
- Add activity slowly. The 2025 guideline strongly recommends a gradual return to everyday activities, at a pace you can manage [4]. The Living guidelines describe staying under the point where symptoms flare [3].
- Hold off on driving until your symptoms have settled enough to drive safely, and ask your care team before you start again [3].
- Check in on your mood. The 2025 guideline strongly recommends checking for mental health conditions, both ones that are new since the injury and ones that have flared [4].
Comparison compiled by Safety Behind the Wheel Foundation
Your first seven days
| Day | Task | Done |
|---|---|---|
| 1 | List your top three symptoms and rate each from 0 to 10 | |
| 2 | Call to book a follow up visit and write the date here | |
| 3 | Put every pill bottle and supplement in one bag | |
| 4 | Read the article that fits your top concern | |
| 5 | Take a short walk or do one light chore, then note how you feel | |
| 6 | Ask someone you trust what changes they have noticed in you | |
| 7 | Compare your ratings for the week and write two questions |
Based on the Living Concussion Guidelines [3, 5] and the 2025 Action Collaborative guideline [4]. Adjust the plan with your care team.
Bring to your first follow up visit
Checklist from Safety Behind the Wheel Foundation
- Your daily symptom ratings from the past week
- The bag of medicines and supplements, or a written list with doses
- Emergency room discharge papers and any scan reports
- The date of the crash and where your head was hit, if you know
- Your top three concerns and two written questions
- A friend or relative who can take notes, if one is free
Red flags: when to skip the reading and get help
Most lingering symptoms can be handled at planned visits, but a few changes cannot wait for one.
Call 911 now or head to the nearest emergency room
The CDC lists these danger signs for adults with a concussion [6]:
- Head pain that keeps building and does not let up
- Weakness, numbness, poorer coordination, convulsions or seizures
- Throwing up more than once
- Words that come out slurred, or actions that seem odd for you
- Pupils of unequal size, with one larger than the other
- Becoming confused, agitated or restless, or trouble knowing who familiar people are or where you are
- Fainting, extreme sleepiness, or nobody being able to wake you
Two other situations call for a prompt check. If new symptoms appear more than 30 days after the injury, the VA and Defense Department guideline suggests looking for causes other than the concussion [9]. Older adults who take warfarin type blood thinners should have a brain scan right away after a concussion, according to the Living Concussion Guidelines [14]. The article on new or worsening symptoms gives the full sorting guide.
If you are thinking about suicide
Long recoveries can wear anyone down. If your mind turns to suicide or self harm, reach out to the Suicide and Crisis Lifeline. Its number is 988 for both calls and texts, and its chat is at 988lifeline.org. Veterans reach the Veterans Crisis Line by pressing 1 after dialing 988, or by texting 838255 [15]. Spanish speakers can press 2 after dialing [15]. Dial 911 at once if someone could be harmed right away. Under the 2025 guideline, suicidal thoughts that are new or much stronger after a TBI may call for emergency care [4]. Help is available, and you deserve support while you heal.
Questions to ask your care team
Question checklist from Safety Behind the Wheel Foundation
- Which term are you using for my condition, and what does it mean for my care?
- Which diagnosis codes are on my records, and why were they chosen?
- Do I have factors that make a longer recovery more likely, and what can we do about them now?
- Which symptom should we work on first?
- It has been more than a month. Should I see a concussion clinic or another specialist?
- Which activities can I add back this week, and how quickly?
- When might I start driving again, and what check will we use to decide?
- Can you screen me for anxiety, depression or posttraumatic stress?
- Which new symptoms mean I should call you today, and which mean I should call 911?
Frequently asked questions
Is post concussion syndrome a brain injury?
A concussion is a mild TBI, and an expert panel agreed the two names can describe the same injury when scans are normal or not needed [1]. PCS describes the symptoms that linger afterward. The word mild refers to the low risk to your life, not to how much the symptoms can affect you [7].
Why does my bill say postconcussional syndrome?
That is the official title of code F07.81, which US clinics use on records and bills [2]. A separate code can be added when headache from the injury is part of the picture [2]. Ask your care team to explain any code you do not recognize.
Do I need a specialist?
Care often starts with your primary care practice. A primary care, symptom focused approach is what the VA and Defense Department guideline suggests for lasting symptoms after a mild TBI [9]. If symptoms still limit you after a month, or treatment is not helping, a referral to a specialist or concussion clinic may be considered [4, 5].
The bottom line
Recommendation from Safety Behind the Wheel Foundation
Post concussion syndrome, persisting symptoms and the F07.81 code are different labels for the same problem: concussion symptoms that last longer than expected [2, 5]. Most adults recover within about a month, and a sizable minority need more time and more help [3, 4].
Start small. Book a follow up visit, rate your symptoms, gather your medicines and read the one article that fits your biggest concern. Call 911 for any danger sign, and call or text 988 if you are thinking about suicide [6, 15].
Sources and further reading
- 1Silverberg ND, Iverson GL, Cogan A, et al. The American Congress of Rehabilitation Medicine diagnostic criteria for mild traumatic brain injury. Archives of Physical Medicine and Rehabilitation. 2023;104(8):1343-1355. doi.org/10.1016/j.apmr.2023.03.036
- 2AAPC. ICD-10-CM code F07.81: Postconcussional syndrome. Accessed October 2026. aapc.com/codes/icd-10-codes/F07.81
- 3Living Concussion Guidelines (Ottawa Hospital Research Institute). Initial management. Updated August 2022. concussionsontario.org/…/initial_management
- 4Silverberg ND, Lee K, Mikolić A, et al. Action Collaborative on Traumatic Brain Injury Care: adapted clinical practice guideline. Annals of Family Medicine. 2025;23(6):552-569. annfammed.org/content/23/6/552
- 5Living Concussion Guidelines (Ottawa Hospital Research Institute). Diagnosis/assessment of prolonged symptoms. Updated April 2023. concussionsontario.org/…/diagnosis-assessment-of-prolonged-symptoms
- 6Centers for Disease Control and Prevention. Symptoms of mild TBI and concussion. Updated September 2025. cdc.gov/…/signs-symptoms/index.html
- 7Centers for Disease Control and Prevention. About mild TBI and concussion. Updated September 2025. cdc.gov/traumatic-brain-injury/about/index.html
- 8Patricios JS, Schneider KJ, Dvorak J, et al. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. British Journal of Sports Medicine. 2023;57(11):695-711. bjsm.bmj.com/content/57/11/695
- 9U.S. Department of Veterans Affairs and Department of Defense. VA/DoD clinical practice guideline for the management and rehabilitation of post-acute mild traumatic brain injury, version 3.0. Provider summary. June 2021. healthquality.va.gov/…/VADoDmTBICPGProviderSummaryFinal508.pdf
- 10International Headache Society. ICHD-3: 5.2 Persistent headache attributed to traumatic injury to the head. Accessed October 2026. ichd-3.org/…/5-2-persistent-headache-attributed-to-traumatic-injury-to-the-head
- 11Polinder S, Cnossen MC, Real RGL, et al. A multidimensional approach to post-concussion symptoms in mild traumatic brain injury. Frontiers in Neurology. 2018;9:1113. frontiersin.org/…/full
- 12University of British Columbia. International group of experts redefines concussions (news release). EurekAlert. May 23, 2023. eurekalert.org/news-releases/989899
- 13Centers for Disease Control and Prevention. Recovery from concussion (HEADS UP). Updated September 2025. cdc.gov/…/recovery-from-concussion.html
- 14Living Concussion Guidelines (Ottawa Hospital Research Institute). Older adults. Updated July 2025. concussionsontario.org/…/older-adults
- 15988 Suicide and Crisis Lifeline. Get help. Accessed October 2026. 988lifeline.org/get-help
This article reflects the safety priorities of concussion recovery and road safety education. It is general education to help you find your way through this guide. It is not medical advice, and it cannot tell you what is causing your symptoms. Check official sources such as the CDC, call 911 in an emergency, and bring your questions to your own care team. Reviewed October 2026.
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