Post-concussion syndrome: when the brain has healed and has not noticed.

The concussion was real. So are the headaches and the fog months later. The question is what is keeping them going.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What post-concussion syndrome is

A concussion is a mild traumatic brain injury caused by a blow or jolt to the head or body that shakes the brain. In the days after, headache, dizziness, nausea, sensitivity to light and noise, fogginess, irritability and poor sleep are expected. For most people these settle within a couple of weeks, and nearly all within three months.

Post-concussion syndrome, now often called persistent post-concussion symptoms, is when they do not. The person is still struggling with headaches, dizziness, concentration, memory, mood and sleep months after the injury, often with scans that are normal and no signs of ongoing brain damage.

Concussion needs to be taken seriously. Worsening headache, repeated vomiting, confusion, weakness, seizures or unequal pupils in the days after a head injury are emergencies. And some persistent symptoms have specific, treatable causes, such as neck injury, inner-ear or eye-movement problems, or a migraine disorder set off by the injury. These should be looked for.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms does not say post-concussion syndrome is neuroplastic. It says it is reasonable to assess for neuroplastic symptoms as a contributing factor, particularly when symptoms are atypical, when they persist for longer than expected, or when the response to treatment is not as expected. Persistence beyond the expected recovery period is, of course, the definition of the syndrome.

Neuroplastic symptoms are real, physical symptoms produced by learned pathways in the brain and nervous system rather than by ongoing damage. They are not imaginary and not a failure of character. After a frightening injury to the head, the nervous system has every reason to stay vigilant. The brain monitors itself for signs of damage, interprets every headache and foggy moment as evidence that something is wrong, and responds with more alarm, more guarding, more avoidance of exertion and screens and noise. That protective loop produces headaches, dizziness, fatigue and poor concentration all by itself. Sleep loss and anxiety deepen it. The injury has healed; the alarm has not stood down.

• The original injury was real and the symptoms now are real.
• What has shifted is the driver: from damaged tissue to a sensitized, vigilant nervous system.
• Related entries: post-traumatic headache and PPPD, a dizziness condition that often follows concussion.

What the research shows

A paper proposing a functional overlay model of persistent post-concussion syndrome argues that psychological factors maintain symptoms after the injury has healed, through negative beliefs about recovery, heightened vigilance for symptoms, illness behaviour, and a focus on physical rather than emotional explanations. It also notes that pre-injury mental health is one of the most consistent predictors of persistence in adults and children.

A 2024 study of people three months after mild traumatic brain injury found that persistent post-concussion symptoms were significantly correlated with catastrophizing thoughts, fear-avoidance behaviour and depression, and the authors suggested that exposure-based approaches should be investigated as a treatment. A multidimensional review of post-concussion symptoms similarly places anxiety, depression and expectation alongside physical factors and notes that recent guidelines recommend assessing them.

The evidence for psychological treatment is still developing. Early education, cognitive behavioural therapy and graded aerobic exercise have shown benefit in some studies, but trials are small and results are mixed. What is well established is that the factors which predict persistence are largely the ones a neuroplastic approach targets.

Signs the brain may be part of the picture

• Your symptoms have lasted well beyond three months with normal scans.
• They are worse on days of stress, worry or poor sleep, independent of exertion.
• You have become afraid of screens, exercise, noise or busy places and avoid them.
• You monitor yourself constantly for signs that your brain is not working.
• Symptoms have spread or changed: new pains, gut or bladder symptoms, palpitations.
• You had anxiety, depression, migraine or chronic pain before the injury.
• Treatment for the specific causes found (neck, vestibular, vision) has not resolved things as expected.

A solution that addresses it

An approach exists that addresses the nervous-system contribution: pain and symptom reprocessing. It begins with education about neuroplastic symptoms, so that lingering headache and fog can be understood as alarm rather than damage. It uses somatic tracking (observing symptoms with curiosity rather than dread), practices that reduce fear and threat, a graded return to exertion, screens, work and social life rather than indefinite rest, emotional awareness and expression, and acceptance and commitment skills. Trained clinicians deliver it, and digital programs increasingly support daily practice. It sits alongside vestibular, vision, neck and headache treatment where those are needed.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. If your concussion recovery has stalled and nobody can say why, you can join the waitlist.

What to do next

If your head injury was recent, follow medical advice and seek urgent care for worsening headache, repeated vomiting, drowsiness, confusion, seizures, weakness or slurred speech. For persistent symptoms, ask for an assessment that covers the neck, the vestibular system, eye movements and headache type, and treat what is found.

Then ask your clinician the index's question: given how long this has lasted, could neuroplastic symptoms be contributing? If the answer is 'possibly', start learning about the fear-avoidance cycle, begin a paced return to activity rather than waiting for symptoms to vanish first, and practise meeting them with calm. Our page on functional neurological disorder and ACT covers closely related ground.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.