Most concussions heal within two to four weeks, especially in children and teenagers. Adults generally follow a similar timeline, though recovery can stretch longer depending on several personal factors. About 31% of younger patients still have symptoms past the one-month mark, so while the majority recover relatively quickly, a significant minority face a longer road.
The Typical Recovery Timeline
The first 48 hours after a concussion are the most symptomatic. Headaches, fogginess, fatigue, and sensitivity to light or noise tend to peak during this window. Over the following days, these symptoms gradually ease for most people. Children with concussions typically feel better within two to four weeks, and most adults land in that same range.
Recovery beyond 28 days is considered prolonged. Beyond 90 days, it’s classified as extended. In a large study of young patients, roughly one in three experienced symptoms lasting longer than a month. Extended recovery past three months is less common but does happen, particularly in patients who had severe initial symptoms or delayed getting care.
What Happens Inside the Brain
A concussion triggers an energy crisis in the brain. After the initial impact, brain cells release chemicals in a rapid, disorganized way, creating a mismatch between the energy the brain needs and the energy it can produce. This metabolic disruption can persist for weeks to months, even after a person feels symptom-free. Research on concussed athletes has found signs of lingering metabolic disturbance that extend beyond the point of medical clearance to return to sport. This is one reason why a gradual return to full activity matters: feeling better and being fully healed are not the same thing.
Factors That Slow Recovery
Several things increase the odds of a longer recovery. The most powerful predictor is how severe your symptoms are in the early days. Patients with high initial symptom scores were roughly two and a half to three times more likely to have a prolonged recovery compared to those with milder presentations.
A history of previous concussions also matters. Compared to a first concussion, having one prior concussion raised the risk of prolonged recovery by about 21%. Three or more prior concussions raised it by 36%. A pre-existing ADHD diagnosis increased the risk by 14%, and a previously diagnosed anxiety disorder was linked to a 47% higher risk of recovery stretching past 90 days.
Age plays a role in extended recovery specifically. For every additional year of age in young patients, the risk of symptoms lasting beyond three months increased by 11%. Delaying your first clinic visit after injury is another consistent risk factor. Each additional week of delay was associated with progressively worse outcomes, likely because early guidance on managing activity and symptoms makes a real difference.
Do Women Recover More Slowly?
Initial data has long suggested that females recover more slowly than males. A study of nearly 500 patients found that females did show slower recovery in raw comparisons. But when researchers accounted for how quickly patients got to a clinic, the difference between sexes disappeared. In other words, the gap appears to reflect a disparity in how quickly women and girls access concussion care, not a biological difference in healing speed. Getting evaluated promptly after a head injury matters for everyone, but this finding suggests it’s especially important to close the gap in how quickly female athletes seek treatment.
Early Activity Helps, Strict Rest Doesn’t
The old advice to lie in a dark room for days is outdated. Current evidence supports relative rest, not strict rest, during the first 48 hours. That means scaling back your normal routine but still doing light activities like walking, basic household tasks, and gentle movement that doesn’t significantly worsen your symptoms. A mild, temporary bump in symptoms (no more than about 2 points on a 10-point scale) is considered acceptable during light activity.
Starting light physical activity within 48 hours of a concussion actually facilitates recovery. After that initial two-day window, adolescents can begin structured aerobic exercise (based on formal exercise testing with a clinician), which has been shown to reduce the risk of persistent symptoms. Reducing screen time in those early days is also recommended, though complete avoidance of all stimulation is unnecessary and potentially counterproductive.
Returning to Sports
Athletes follow a six-step progression back to competition, with each step taking at least 24 hours. You only advance if no new symptoms appear at the current step.
- Step 1: Return to regular daily activities like school or work, with clearance from a healthcare provider.
- Step 2: Light aerobic activity only, such as 5 to 10 minutes of walking, light jogging, or stationary biking. No weight lifting.
- Step 3: Moderate activity that increases heart rate with body or head movement, including moderate jogging and lighter-than-usual weight lifting.
- Step 4: Heavy non-contact activity like sprinting, high-intensity biking, and full weightlifting routines.
- Step 5: Full-contact practice in a controlled setting.
- Step 6: Return to competition.
At minimum, this progression takes about a week from start to finish. In practice, it often takes longer because symptoms can resurface at any step, requiring you to drop back to the previous level for at least 24 hours before trying again.
Returning to School or Work
Most children can return to school within one to two days of a concussion, but with temporary adjustments. These accommodations are tailored to whatever symptoms are most prominent. For cognitive difficulties like trouble concentrating or remembering things, that might mean reduced homework, extra time on tests (limited to one per day), written instructions, or access to class notes. For physical symptoms like headaches and light sensitivity, it could mean rest breaks, sunglasses indoors, a seat away from windows, or a quiet space for tests and lunch. Emotional changes are common too, and having a designated adult to talk to when feeling overwhelmed can help.
These supports are meant to be short-term. As symptoms improve, accommodations are gradually removed until the student is back to their full routine. Adults returning to cognitively demanding work benefit from a similar approach: shorter hours, fewer meetings, and more frequent breaks during the first week or two, scaling back up as symptoms allow.
Danger Signs That Need Emergency Care
Most concussions are managed at home, but certain symptoms after a head impact signal something more serious, like bleeding in or around the brain. Call 911 or go to an emergency department if you notice any of the following:
- Seizures or shaking
- Repeated vomiting
- Inability to recognize people or places
- Increasing confusion, restlessness, or agitation
- Loss of consciousness, extreme drowsiness, or inability to stay awake
- Slurred speech, weakness, numbness, or loss of coordination
- A headache that keeps getting worse
- One pupil noticeably larger than the other, or double vision
In infants and toddlers, inconsolable crying or refusal to eat or nurse are additional warning signs that warrant immediate medical attention.