How Long Does a Concussion Last After a Car Accident?

The crash is over, the adrenaline has worn off, and now your head will not stop pounding. Maybe you feel foggy, like you cannot quite think straight. Maybe bright light suddenly bothers you in a way it never did before. If you hit your head, or even if your head snapped hard without hitting anything, you may be dealing with a concussion, and one of the first questions most people ask is simple: how long is this going to last?

The honest answer is that it depends, but not in a vague way. Most concussions follow a fairly predictable pattern, and knowing what that pattern looks like, day by day, can tell you what is normal and what is not. It can also tell you when it is time to get checked rather than wait it out.

At Primary & Urgent Care Center's car accident injury clinic in Lake Worth, we evaluate concussions from car accidents on a walk-in basis, with imaging on site to rule out anything more serious in the same visit.

How long a concussion typically lasts

Most concussions resolve within one to two weeks. Most people feel mostly back to normal within 10 to 14 days when they rest appropriately in the first few days and then gradually return to normal activity.

A smaller group takes longer. Some studies put full symptom resolution at two to four weeks for the average adult. When symptoms stretch past four weeks, doctors start using the term persistent post-concussion symptoms. Roughly 1 in 10 to 1 in 5 people who have a concussion end up in this longer-recovery group, and a smaller share of those still have symptoms that linger six months or more.

What a concussion timeline actually looks like, day by day

• First 24 to 48 hours: symptoms are often at their worst. Headache, dizziness, nausea, and confusion are common. Rest, both physical and mental, matters most right now.

• Days 3 to 7: most people start noticing gradual improvement. Screen time, bright light, and noise may still trigger symptoms, so easing back into normal activity slowly is the goal, not pushing through.

• Week 2: for most people, this is when symptoms are largely resolved or close to it. Light activity and a return to work or school, with modifications if needed, is often appropriate by now.

• Weeks 2 to 4: if symptoms are still present, they are usually milder than the first week, but this is the window where it becomes worth tracking whether things are actually improving or have plateaued.

• Past 4 weeks: this is when persistent post-concussion symptoms become the working diagnosis, and it is a reasonable point to get a more thorough evaluation if you have not already.

Why some concussions last longer than others

A few factors tend to predict a longer recovery: how severe the initial symptoms were in the first 24 to 48 hours, whether you have had a prior concussion, your age, and whether you have a history of migraines, anxiety, or depression. None of these guarantee a long recovery, but they shift the odds.

The mechanism of injury matters too. A car accident concussion is often different from a sports concussion. In a crash, your head can be struck by the steering wheel, window, or headrest, or your brain can be jarred inside your skull from rapid deceleration alone, no direct impact required. That second mechanism, sometimes called a coup-contrecoup injury, is exactly why you can have a real concussion after a car accident even if you never hit your head on anything.

Why the headache or fog may not have started right away

It is common for concussion symptoms to show up hours after a crash, not immediately. Adrenaline from the accident itself can mask pain and confusion in the first hour or two. Inflammation inside the skull also builds gradually, which is part of why a headache that was not there at the scene can be pounding by that evening or the next morning.

This delayed pattern is one of the most common reasons people put off getting checked. If you felt "fine" right after the accident and now do not, that is not unusual, and it is still worth an evaluation.

Symptoms to watch for

• Headache or pressure in the head

• Dizziness or balance problems

• Nausea

• Sensitivity to light or noise

• Difficulty concentrating or remembering

• Feeling foggy, slowed down, or "not quite right"

• Irritability or mood changes

• Trouble sleeping, or sleeping much more than usual

Red-flag symptoms that require ER care

Most concussions do not need emergency care once serious injury has been ruled out, but some symptoms mean you should not wait. Call 911 or go to the ER if you have: a headache that keeps getting worse rather than better, repeated vomiting, one pupil that looks larger than the other, slurred speech, weakness or numbness in an arm or leg, a seizure, increasing confusion or difficulty waking up, or loss of consciousness at the scene.

Urgent care vs ER for a concussion

If you are not experiencing any of the red-flag symptoms above, a same-day evaluation at an urgent care clinic with imaging on site is often the right first step, faster than an ER wait and still thorough enough to catch anything that needs more than rest and monitoring. Read our full breakdown on urgent care vs ER after a car accident for a side-by-side comparison.

Florida's 14-Day PIP Rule

If you were in a car accident in Florida, there is a deadline that has nothing to do with how you feel and everything to do with your insurance coverage. Under Florida's no-fault law, you must receive an initial medical evaluation within 14 days of the accident date, not 14 days from when symptoms started, to access up to $10,000 in PIP (Personal Injury Protection) benefits. Concussion symptoms that show up gradually are exactly the kind of injury this rule catches people off guard on. See our full guide to PIP documentation and the 14-day rule for what to bring and what gets documented.

What to expect at your evaluation

A concussion evaluation starts with a conversation: how the accident happened, whether you hit your head, what symptoms you have noticed and when they started. That is followed by a neurological exam checking balance, reflexes, memory, and eye movement.

If imaging is warranted, it happens in the same visit. Our on-site digital X-ray and imaging suite can help rule out a skull fracture or bleeding, so you are not sent to a separate facility and waiting days for results. Everything from your visit, the exam findings, the imaging, the diagnosis, gets documented for your PIP claim at the same time.

No appointment is needed. We see most patients in 15 minutes or less on a walk-in basis.

A concussion is not something to guess your way through, especially with a 14-day PIP deadline running in the background. If you were in a car accident and are dealing with a headache, fogginess, dizziness, or anything that does not feel right, get evaluated. Visit our car accident injury clinic in Lake Worth for a same-day walk-in evaluation with imaging and documentation handled in one visit.