Why do concussion symptoms last for weeks or months?

What is a concussion?

A concussion is a mild traumatic brain injury caused by a blow to the head or body that makes the brain move quickly inside the skull. It disrupts how brain cells work for a period, even though standard scans are usually normal. Loss of consciousness does not have to happen for a concussion to occur.

Typical early symptoms include headache, dizziness, nausea, feeling foggy or slowed down, sensitivity to light and noise, poor memory for the event, irritability and tiredness. International consensus on sport-related concussion describes these and recommends a structured, stepwise return to activity 1.

When is a head injury an emergency?

Some signs after a head injury need urgent hospital assessment: a worsening headache, repeated vomiting, drowsiness that is increasing, confusion, slurred speech, weakness or numbness, a seizure, clear fluid from the nose or ears, loss of consciousness, or a dangerous mechanism of injury. Older people and those on blood-thinning medicines have a lower threshold for scanning 2.

These signs may indicate bleeding or swelling that needs treatment. They should never be managed at home by waiting to see if they pass.

Why do some people recover more slowly?

Persisting symptoms are rarely caused by one thing. The same blow that causes a concussion can strain the neck, producing headaches and dizziness from the neck muscles and joints. The balance organs of the inner ear or the eye movement systems may be disturbed, causing dizziness or visual discomfort. Sleep is often disrupted, which worsens concentration and headache.

Anxiety, low mood, stress at work or school and worry about the injury also influence symptoms. Previous concussions, migraine, mental health conditions and learning difficulties are associated with slower recovery. None of this means symptoms are imagined; it means treatment needs to address each contributing factor.

Is rest or activity better after a concussion?

A short period of relative rest in the first day or two is reasonable, avoiding activities that clearly worsen symptoms. After that, prolonged strict rest is no longer recommended, because inactivity can prolong symptoms and lead to deconditioning and low mood. Light activity, such as walking, can usually begin early and increase gradually as long as symptoms do not significantly worsen 1.

Return to learning and work is also gradual, with breaks, reduced screen time where it triggers symptoms and adjustments to workload. Return to contact sport should follow a stepwise programme and medical clearance, because a second injury before recovery is a risk.

How are persisting symptoms treated?

Treatment is matched to the problems found. Sub-symptom threshold aerobic exercise, where people exercise just below the level that brings on symptoms, can help recovery. Neck physiotherapy treats cervical headache and neck-related dizziness. Vestibular rehabilitation, with specific exercises for balance and gaze stability, helps dizziness from inner ear or brain balance disturbance 3.

Headaches may need a review of painkiller use, because frequent use can cause medication-overuse headache. Sleep strategies, psychological therapies for anxiety or low mood, and cognitive strategies for concentration and memory are often part of a combined programme.

How long should symptoms last before seeing a specialist?

If symptoms have not clearly improved after a few weeks, or they are severe, getting worse or affecting daily life, a specialist review is worthwhile. Specialist services can assess neck, vestibular, visual, cognitive and psychological contributors together rather than one at a time.

Early explanation and reassurance help many people. Understanding that symptoms are common, that recovery usually continues and that specific treatments exist reduces worry, which itself can ease symptoms.

Can people fully recover from persisting concussion symptoms?

Many people recover fully, even when symptoms have lasted for months. Progress is often uneven, with setbacks after stress, illness or overdoing activity. Keeping a gradual, planned increase in activity and continuing specific treatments tends to produce steady improvement.

A small number of people have longer-term difficulties, often related to multiple contributing factors. Ongoing rehabilitation, support at work or school and management of mood and sleep remain helpful in these cases.

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