How Long Does a Concussion Last?

Quick Answer

Most concussions resolve within 2–4 weeks with proper rest and a gradual return to activity. Children and adolescents may take longer to recover than adults. Approximately 80% of concussions clear within 14 days, but 10–30% of people develop post-concussion syndrome (PCS), where symptoms persist for weeks to months.

Recovery Timeline by Phase

Phase	Timeframe	What Happens
Acute	0–72 hours	Most intense symptoms — headache, confusion, dizziness, nausea
Subacute	3–14 days	Symptoms gradually improve, cognitive fog starts lifting
Recovery	2–4 weeks	Most people return to normal activity
Prolonged (PCS)	1–12 months	Persistent headaches, difficulty concentrating, mood changes in a subset of patients

Common Concussion Symptoms

Physical

• Headache (most common, reported in 86–96% of cases)
• Dizziness and balance problems
• Nausea or vomiting
• Sensitivity to light and noise
• Fatigue
• Blurred or double vision

Cognitive

• Difficulty concentrating
• Memory problems
• Feeling mentally foggy
• Slower processing speed

Emotional

• Irritability
• Anxiety
• Sadness
• Mood swings

Sleep-Related

• Sleeping more or less than usual
• Difficulty falling asleep

Factors That Affect Recovery Time

Factor	Effect on Recovery
Age	Children and teens take longer (up to 4 weeks); adults often recover in 10–14 days
History of prior concussions	Each subsequent concussion tends to take longer to resolve
Severity of initial symptoms	More severe symptoms in the first 24 hours correlate with longer recovery
Pre-existing conditions	Migraines, ADHD, anxiety, and depression can prolong recovery
Immediate rest	Relative rest in the first 48 hours supports faster recovery
Sex	Some research suggests females may take longer to recover than males

Return-to-Activity Protocol

The consensus return-to-activity protocol follows a stepwise progression. Each step requires a minimum of 24 hours with no symptom worsening before advancing.

1. Symptom-limited activity — Daily activities that do not worsen symptoms. Screen time limited. No exercise.
2. Light aerobic exercise — Walking, stationary cycling at slow pace. No resistance training. Heart rate below 70% max.
3. Sport-specific exercise — Running drills, skating, sport-related movements. No head-impact activities.
4. Non-contact training drills — Increased intensity, coordination exercises, progressive resistance training.
5. Full-contact practice — After medical clearance. Full participation in normal training activities.
6. Return to competition — Normal game play with no restrictions.

If symptoms return at any step, drop back to the previous step for at least 24 hours before trying again.

Post-Concussion Syndrome (PCS)

When symptoms persist beyond the expected 2–4 week recovery window, the condition is classified as post-concussion syndrome. PCS affects 10–30% of concussion patients and is characterized by:

• Persistent headaches
• Ongoing cognitive difficulties
• Mood disturbances (depression, anxiety)
• Sleep disruption
• Dizziness that does not resolve

Treatment for PCS may include vestibular therapy, cognitive behavioral therapy, targeted exercise programs under medical supervision, and medication for specific symptoms like headaches or sleep disorders.

When to Seek Emergency Care

Go to the emergency room immediately if you observe any of the following after a head injury: worsening headache that does not respond to over-the-counter pain relievers, repeated vomiting, seizures, slurred speech, weakness or numbness in limbs, one pupil larger than the other, loss of consciousness lasting more than 30 seconds, or increasing confusion. These signs may indicate a more serious brain injury such as a brain bleed.

Second Impact Syndrome

Sustaining a second concussion before the first has fully healed is extremely dangerous. Second impact syndrome, though rare, can cause rapid and severe brain swelling and is potentially fatal. This is why the stepwise return-to-activity protocol exists and why athletes should never return to play while still symptomatic.