Post-traumatic headache: the injury healed, the alarm stayed on.

A year on from the knock, the headaches are still here and the scans are clear. The research has an explanation that is not about damage.

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-traumatic headache is

Post-traumatic headache is any headache that starts within a week of a head injury. Most cases follow mild traumatic brain injury, which is what concussion is. It can feel like migraine (throbbing, light-sensitive, with nausea) or like tension-type headache (a tight band), and it often comes with dizziness, poor concentration, sleep problems, irritability and fatigue, the cluster known as post-concussion syndrome.

In the early weeks there are plausible tissue explanations. The scalp, neck muscles and tissues around the skull can be bruised and sensitized. The injury may also disturb the brain's own pain-processing circuits. Either way, most post-traumatic headache settles within three months. When it lasts longer, it is called persistent post-traumatic headache.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms says neuroplastic symptoms should be assessed as part of a complete evaluation of post-traumatic headache, particularly for headaches that persist more than a year after injury or that have atypical features. It highlights a telling finding: in a large study, persistent headache a year after injury was more likely in people who already had headaches before the injury, and was not linked to how bad the injury was.

Neuroplastic symptoms are real symptoms produced by learned pathways in the brain and nervous system, a sensitized alarm system, rather than by ongoing damage or disease. They are not imaginary and not a sign of weakness, and because the brain can change, they are reversible. In post-traumatic headache, the sequence often looks like this:

• The injury sets off real pain and a frightening experience.
• Fear about brain damage, about the future, and about every new symptom keeps the nervous system on high alert.
• A nervous system already prone to headache, which is what a pre-injury history indicates, learns the headache pattern quickly and holds on to it.
• Rest, avoidance of screens, light and activity, and constant monitoring of the head all keep the alarm sensitized.

The headache is then being maintained by the brain's prediction of pain, not by the healed tissue. This is the same mechanism described in central sensitization, and it is why injury severity stops predicting outcome.

What the research shows

An exploratory longitudinal study tested whether deficient pain-modulating systems predict persistent post-traumatic headache. People with mild TBI who had weaker endogenous pain inhibition, meaning their nervous system was less able to dampen pain signals, at one week after injury were more likely to have persistent headache at four months. Those with persistent headache also showed higher psychological distress across the follow-up. The sample was small, but it suggests the nervous system's sensitivity, not the blow, sets the course.

A study of psychiatric and cognitive comorbidities in persistent post-traumatic headache attributed to mild TBI compared 100 patients with healthy controls. Probable depression was found in 42 percent of the headache group versus 2 percent of controls, and poor sleep was far more common. These are the conditions that sensitize pain pathways, and they are treatable.

A position paper on the relationship between head trauma, stress disorder and migraine argues that post-traumatic headache sits at the intersection of injury, pre-existing headache tendency, stress and mood. It describes how a pre-existing headache disorder can be amplified by head trauma, stress, depression, post-traumatic stress and environmental stressors, which fits the ATNS observation about pre-injury history.

Caveats: the pain-modulation study was a pilot, the comorbidity data are cross-sectional so they show association rather than cause, and research on specific psychological treatments for post-traumatic headache is still limited.

Signs the nervous system may be part of the picture

• Headaches have lasted more than three months, and especially more than a year, after a mild injury.
• Imaging is normal, and the injury itself was not severe.
• You had headaches or migraines before the injury.
• Headache is worse with stress, poor sleep, anxiety or emotional strain.
• You are afraid of permanent brain damage and monitor your head for symptoms.
• You have cut out screens, exercise, work or socialising for a long time without improvement.
• Low mood, poor sleep and fatigue are part of the picture.

A solution that addresses it

There is an approach that works on the brain's contribution to pain. Often called pain reprocessing, it combines education about neuroplastic symptoms, somatic tracking (observing the headache sensation with curiosity rather than fear), reducing threat and fear of brain damage, a graded return to activity, screens and exercise, emotional awareness and expression, and acceptance and commitment skills. Trained clinicians deliver it, and it is increasingly available through digital programs. It complements, rather than replaces, medical headache care and any physiotherapy for the neck.

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 headache has outlasted your injury, you can join the waitlist.

What to do next

First, make sure the injury has been properly assessed. If you have never been examined after your head injury, or if headaches are worsening, see a clinician. Neck injury is a common and treatable contributor and is often overlooked. Keep taking any prescribed medication, and ask about medication-overuse headache if you are using painkillers on most days.

Second, if the assessment is clear and headaches persist, ask whether a sensitized nervous system could be maintaining them. Mention any pre-injury headache history; it is relevant.

Third, if it fits, begin a gentle, graded return to normal life rather than continued rest. Use pacing to avoid boom and bust, work on sleep, and practise meeting the headache with less alarm. The hurt versus harm distinction is central here.

Seek urgent medical attention for a headache that is suddenly severe, steadily worsening, accompanied by vomiting, confusion, drowsiness, weakness, slurred speech, seizures, or a new headache in someone over 60 or on blood thinners after a head injury.

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.