Concussion Symptoms That Won’t Go Away: What’s Normal, and When to Get Help

You were told a concussion is “mild.” Weeks later, you still have headaches, you’re exhausted by noon, and reading a page feels like work. You are not imagining it, and you are not alone.

How long do concussion symptoms usually last?

Most people start to feel better within days to a few weeks. For many adults, symptoms clear within about a month. But a meaningful number of people still have symptoms well beyond that.

In a large US study that followed people seen at trauma centers after a brain injury, most participants still reported at least one new or worse symptom months later. Among those with a mild injury, 42% reported four or more symptoms a full year after the injury. The people in that study came from emergency departments, so they may have had more serious injuries than the average concussion, but the message is clear: lasting symptoms are common, not rare.

When symptoms continue for more than about four weeks, doctors call it persisting post-concussion symptoms (you may also see “post-concussion syndrome”).

The symptoms that tend to stick around

In the first couple of weeks, the most common symptoms are fatigue, headache, dizziness and slowed thinking. The ones most likely to last are the thinking symptoms:

• taking longer to think, or “brain fog”
• poor memory and trouble concentrating
• fatigue
• sleep problems
• headaches, sensitivity to light or noise, and feeling irritable, anxious or down

These symptoms feed each other. Poor sleep makes headaches and fog worse; headaches make it hard to exercise; low activity makes sleep and mood worse. That loop is one reason symptoms can drag on.

Why do some people recover slowly?

There isn’t one cause. Things that are linked with slower recovery include a history of migraines or earlier concussions, poor sleep after the injury, anxiety or low mood, neck injury, and problems with balance or vision. Long stretches of complete rest can also slow recovery. The old advice to sit in a dark room until you feel better has been replaced: current guidance is a short period of relative rest, then a gradual return to activity.

What actually helps

1. Light aerobic exercise, kept below your symptom limit

Walking or cycling at a comfortable effort, kept low enough that symptoms only rise a little, is the active treatment with the most research behind it. The 2023 international consensus on sport concussion recommends it, including for people whose symptoms have lasted more than a month. A simple way to dose it is the 2-point rule.

2. Steady sleep

Sleep problems after a concussion are linked to slower recovery and to lasting thinking symptoms. The most useful habit is boring and powerful: the same bedtime and wake time every day, weekends included, with screens off before bed.

3. A gradual return to what you care about

Work, school, driving, screens, busy places: pick the one that matters most, break it into small steps, and move up a step when the current one goes well. Small, regular wins beat big, occasional pushes.

4. Targeted therapy when one system is the problem

If dizziness or balance is the main issue, vestibular therapy can help. Neck-related headaches may respond to physical therapy. Persistent low mood or anxiety deserves treatment of its own. Your doctor can point you to the right one.

When to see a doctor

See your doctor if symptoms are not improving after a few weeks, if they are getting worse, or if they are keeping you from work, school or driving. Bring a short list: your main symptoms, what makes them worse, and how you’ve been sleeping.

References

1. Machamer J, et al. Symptom frequency and persistence in the first year after traumatic brain injury: a TRACK-TBI study. J Neurotrauma. 2022;39(5-6):358–370.
2. Patricios JS, et al. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. Br J Sports Med. 2023;57:695–711.
3. US Centers for Disease Control and Prevention. HEADS UP: concussion signs and symptoms; danger signs.

This article is general education, not medical advice, and reading it does not create a doctor-patient relationship. Concussion recovery is individual: talk with your own doctor about your symptoms and before starting or changing exercise. Last reviewed October 10, 2026.