Most concussions last 10 to 14 days for adults. Symptoms typically resolve within 2 to 4 weeks. Children and teenagers often take 4 weeks or longer to recover because their brains are still developing. When symptoms continue beyond 3 months, doctors may diagnose post-concussion syndrome — a prolonged form of recovery affecting an estimated 10–30% of patients.
The timeline varies from person to person. Age, the severity of the blow, a history of prior concussions, and how quickly you rest all affect how long recovery takes.
What Is a Concussion?
A concussion is a type of traumatic brain injury — commonly called a mild TBI or mTBI — caused by a bump, blow, or jolt to the head. When your head moves rapidly back and forth, the brain bounces or twists inside the skull. That motion triggers chemical changes in the brain and can stretch or damage brain cells.
The word "mild" in mild traumatic brain injury refers to how the injury presents initially — not to how it affects the person living with it. Concussions can disrupt sleep, work, memory, and emotional health for weeks or months.
You do not need to lose consciousness to have a concussion. Most people who sustain one remain fully conscious.
Concussion Symptoms: What to Watch For
Concussion symptoms fall into four categories. Some appear immediately after the injury; others take hours or days to emerge.
Physical symptoms:
- Headache or pressure in the head
- Dizziness or balance problems
- Nausea or vomiting
- Sensitivity to light and noise
- Blurred or double vision
- Feeling slowed down or "not right"
Cognitive symptoms:
- Difficulty concentrating
- Memory problems
- Mental fogginess or confusion
- Slowed thinking
Emotional and mood symptoms:
- Irritability or sadness
- Anxiety
- Feeling more emotional than usual
Sleep symptoms:
- Sleeping much more than normal
- Difficulty falling asleep
- Disturbed sleep patterns
The CDC notes that some concussion symptoms appear right away, while others may not surface for hours or days after the injury.
Danger signs requiring emergency care: Call 911 or go to the nearest emergency room if the injured person experiences loss of consciousness, seizures, worsening headache, one pupil larger than the other, repeated vomiting, or slurred speech. These can signal a more serious brain injury.
How Long Does a Concussion Last? Recovery Timelines by Age
Recovery does not follow a single path. Here is what the research shows for different groups.
For Most Adults
The first 24 to 48 hours after a concussion call for physical and cognitive rest. Limit screen time, reading, strenuous exercise, and mentally demanding tasks. The goal is to avoid putting extra strain on a brain that is already working hard to recover.
By days three through seven, most people can begin a gradual return to light activity as symptoms allow. Controlled, gradual activity resumption is part of the standard recovery protocol — prolonged bed rest is not recommended beyond the first couple of days.
Most mild concussions in adults resolve within 7 to 14 days. Full symptom resolution typically occurs by weeks two to four. A University of Michigan study found that 28 days more accurately captures normal concussion recovery — at that point, 85% of patients had returned to their prior baseline.
For Children and Teenagers
Children and teens consistently take longer to recover than adults. Their developing brains are more vulnerable and slower to heal.
Pediatric guidelines generally set recovery expectations at 4 weeks or more. Schools often need to provide accommodations: reduced homework, extended test time, and breaks from screens and noisy environments. Many children follow a structured return-to-learn protocol in addition to any return-to-sport plan.
When Concussion Recovery Takes Longer Than Expected
Roughly 10–30% of people experience symptoms that extend beyond one month. This is more common among:
- People who have had prior concussions
- Older adults and young children
- People with a history of migraines, anxiety, or depression
- Those who returned to demanding activity before fully recovering
- People who did not receive a prompt medical evaluation
Post-Concussion Syndrome: When Symptoms Last for Months
When concussion symptoms persist beyond 3 months in adults, doctors may diagnose post-concussion syndrome (PCS). In children and adolescents, persistent symptoms lasting more than 4 weeks receive closer follow-up, with PCS criteria applied after longer observation.
Post-concussion syndrome is not caused by visible structural damage on an MRI or CT scan. It typically reflects disrupted brain chemistry and altered neural pathways — the ongoing effects of the original injury.
Common PCS symptoms include:
- Chronic headaches
- Persistent brain fog or difficulty concentrating
- Ongoing fatigue
- Sleep disturbances
- Depression or anxiety
- Sensitivity to light and noise
Research from the NIH notes that persistent post-concussive syndrome can affect cognition, memory, learning, and executive function — and can significantly delay a person's return to work and daily life.
Treatment for post-concussion syndrome is typically multidisciplinary. A care team may include a neurologist, physical therapist, cognitive rehabilitation specialist, and mental health professional. No single treatment works for everyone, but structured programs have shown real results.
Factors That Affect How Long a Concussion Lasts
Several factors can lengthen or complicate concussion recovery time:
Age. Older adults and young children generally recover more slowly than healthy adults.
Previous concussions. Each prior concussion can extend recovery time and raise the risk of post-concussion syndrome. Repeated concussions over a lifetime carry cumulative risks.
Returning to activity too soon. Going back to strenuous physical or mental activity before symptoms fully resolve can worsen them. Second-impact syndrome — a second concussion sustained before the first has fully healed — is a recognized but rare condition in young athletes. Medical literature notes that it can cause rapid brain swelling, though its exact mechanism and frequency remain subjects of ongoing research.
Pre-existing conditions. A history of migraines, anxiety, depression, sleep disorders, or ADHD can make symptoms more intense and harder to clear.
Sleep and stress. Poor sleep and high stress levels interfere with the brain's ability to repair itself.
Timing of medical care. People who receive prompt evaluation and follow structured recovery guidance tend to do better than those who push through symptoms.
When to See a Doctor
After any blow to the head, a medical evaluation is recommended — even if symptoms seem minor. Emergency care is required immediately for the danger signs listed above.
For non-emergency symptoms, see a doctor within one to two days of the injury. Early evaluation helps rule out more serious injuries and gives you a clear recovery plan.
If symptoms have not started improving by seven to ten days, follow up with your doctor to check for early signs of post-concussion syndrome. If symptoms persist past four weeks, a referral to a neurologist or concussion specialist is typically the next step.
Frequently Asked Questions About Concussion Duration
How long does a mild concussion last?
Most mild concussions in adults resolve within 7 to 14 days. Children and teenagers typically recover in 4 weeks or longer. The term "mild" refers to the initial clinical presentation — not the severity of symptoms during recovery.
Can a concussion last months?
Yes. When concussion symptoms persist beyond 3 months, doctors may diagnose post-concussion syndrome. Research suggests this affects approximately 10–30% of patients, depending on the population studied. With proper treatment, many people with post-concussion syndrome do recover, though timelines vary.
What helps a concussion heal faster?
Rest for the first 24 to 48 hours, then a gradual return to activity under your doctor's guidance. Adequate sleep, stress reduction, avoiding alcohol, and staying hydrated all support healing. Do not push through symptoms — returning to activity too soon can set recovery back.
Is it normal to still have headaches 2 weeks after a concussion?
Headaches at two weeks are common, particularly after a more severe initial injury or if you returned to activity too quickly. If headaches are not improving by weeks three to four, see a doctor. Persistent headache is one of the most common post-concussion symptoms.
Can you get a concussion without hitting your head?
Yes. Whiplash-type injuries can shake the brain inside the skull without direct head contact. This happens in rear-end car accidents, sports tackles, and explosive blasts. The result can be a concussion even when the head never strikes a surface.
When should you go to the ER for a concussion?
Go to the emergency room immediately if you notice: loss of consciousness, one pupil larger than the other, seizures, repeated vomiting, a headache that keeps worsening, extreme sleepiness, or slurred speech. These can indicate bleeding in or around the brain and require urgent evaluation.
How many concussions does it take to cause permanent damage?
There is no safe number. Research shows that repeated concussions — especially those sustained before a prior injury has fully healed — carry cumulative risks, including chronic traumatic encephalopathy (CTE). Athletes and others with multiple head injuries over time face elevated risk of long-term cognitive effects.
If Your Concussion Was Caused by Someone Else's Negligence
A concussion that results from a car accident, slip and fall, workplace incident, or another accident caused by someone else's negligence is not just a medical matter. It may also be a legal one. If you are dealing with lasting symptoms, lost time from work, or ongoing medical costs after a head injury that was not your fault, The Orlow Firm's Queens brain injury lawyers can help you understand what legal options may be available.
Sources & Official Resources
Medical References
- CDC — Signs and Symptoms of Concussion (HEADS UP)
- CDC — What to Do After a Mild TBI or Concussion
- CDC — Recovering from a Concussion (HEADS UP)
Research & Clinical References 4. NIH/NCBI — Postconcussive Syndrome (StatPearls) 5. NIH/NCBI — Second Impact Syndrome (StatPearls) 6. NIH/NCBI — Treatment and Management of Prolonged Symptoms and Post-Concussion Syndrome 7. University of Michigan — Normal Concussion Recovery Could Take Up to a Month
New York State Health Resources 8. New York State DOH — Traumatic Brain Injury: Symptoms
Contact The Orlow Firm
If a concussion or brain injury has disrupted your life — and it resulted from someone else's negligence — The Orlow Firm is here to help. We have represented injury victims in Queens and throughout New York City for over 40 years. Our attorneys handle personal injury cases on a contingency basis: you pay nothing unless we recover compensation for you.
Call (646) 647-3398 for a free consultation. Se Habla Español.
