Post-traumatic headache is a headache that develops within seven days of a head injury, and it is the most common symptom following concussion and traumatic brain injury. For most people, these headaches resolve within three months. But roughly 15 to 58 percent of people (depending on the study) still experience them a year later, making this one of the more unpredictable consequences of even a “mild” head injury.
How It’s Defined
The International Classification of Headache Disorders divides post-traumatic headache into two categories based on duration. A headache that starts within seven days of a head injury (or within seven days of regaining consciousness, if you were knocked out) is classified as acute post-traumatic headache. If that headache continues beyond three months, it becomes persistent post-traumatic headache.
The seven-day onset window is strict in the formal criteria, though some researchers have questioned whether it captures every case. The key requirement is a clear link between a head injury and a new headache, or a significant worsening of a pre-existing one.
What It Feels Like
Post-traumatic headache doesn’t have a single signature. It mimics other headache types, which is part of what makes it frustrating to deal with. Some people develop a throbbing, one-sided headache with light and sound sensitivity that looks identical to migraine. Others get a pressing, band-like pain on both sides of the head that resembles a tension-type headache. Some experience a mix of both patterns, or their headaches shift between types over time.
Beyond the headache itself, many people report trouble concentrating, dizziness, fatigue, and irritability. These overlapping symptoms are part of the broader post-concussion picture, and they can make the headache feel more disabling than the pain alone would suggest.
What Happens in the Brain
A head injury sets off a cascade of events inside the skull. Damaged tissue releases inflammatory molecules, including signaling proteins that activate immune cells and pain-sensing nerve fibers. This process, called neurogenic inflammation, essentially puts pain pathways on high alert.
At the same time, the impact can cause widespread disruption to nerve fibers (diffuse axonal injury), alter blood flow in the brain, and trigger a surge of the brain’s main excitatory chemical. This flood of neural activity creates a kind of energy crisis in brain cells, some of which may be permanently damaged. Together, these changes help explain why a single blow to the head can produce headaches that last weeks or months: the brain’s pain-processing systems have been physically altered.
Who Is More Likely to Develop Chronic Symptoms
Several factors increase the risk of headaches that persist well past the three-month mark. Female gender is one of the strongest predictors. A history of prior concussions also raises the likelihood, as does having a pre-existing headache disorder like migraine. Being injured while under the influence of alcohol is another recognized risk factor, as are elevated markers of inflammation measured shortly after injury.
Nearly 30 percent of people with persistent post-traumatic headache also have post-traumatic stress disorder, and the two conditions appear to reinforce each other. PTSD can amplify pain perception, disrupt sleep, and increase anxiety, all of which make headaches harder to treat. Insomnia, tinnitus, and vertigo are also linked to headache persistence, particularly in people who already had headaches at the time of their initial evaluation.
Recovery Timeline
Most post-traumatic headaches improve gradually. In one cohort study, about 32 percent of people still had headaches three months after a mild traumatic brain injury, dropping slightly to 29 percent at six months. Other research paints a less optimistic picture, with 49 to 58 percent of patients still reporting headaches at 12 months. The wide range likely reflects differences in study populations, injury severity, and how headaches were measured.
The clearest takeaway is that the first three months are a meaningful window. If your headaches are improving steadily during that period, the odds of full resolution are good. If they plateau or worsen, that’s a signal the headache may be shifting toward a chronic pattern.
Treatment for Acute Post-Traumatic Headache
Early treatment focuses on simple pain relievers. Ibuprofen started within 48 hours of injury, combined with acetaminophen, has the best supporting evidence. The goal is to manage pain during the acute window without overdoing it, because using pain relievers too frequently (more than two or three days per week over several weeks) can itself trigger rebound headaches, sometimes called medication-overuse headache.
Opioids are not recommended. They haven’t shown effectiveness for this type of headache, and they carry a risk of dependence and rebound pain. For headaches that don’t respond to over-the-counter options, intravenous therapies in a clinical setting may be considered, but that’s typically reserved for severe, refractory cases.
Managing Persistent Post-Traumatic Headache
When headaches continue past two weeks, some clinicians recommend starting with supplements. Magnesium (400 to 500 mg nightly) and riboflavin (400 mg daily) are commonly suggested, with a trial period of six to eight weeks to assess benefit. These are borrowed from migraine prevention guidelines, where they have reasonable evidence. Melatonin at 3 to 5 mg nightly may help if sleep disruption is part of the picture.
If headaches remain frequent and functionally limiting at four to six weeks post-injury, prescription preventive therapies become an option. These include certain antidepressants, anti-seizure medications, and blood pressure medications, all of which have pain-modulating properties that can reduce headache frequency over time. The choice depends on the headache pattern and any coexisting symptoms like insomnia or mood changes.
Injectable treatments have generated interest, particularly for persistent cases that resemble chronic migraine. Botulinum toxin injections (administered quarterly to muscles in the face, head, and neck) are well established for chronic migraine, but their specific effectiveness in post-traumatic headache is still supported by limited evidence. Similarly, newer injectable therapies that target a pain-signaling molecule called CGRP have not yet demonstrated clear benefit in clinical trials for this condition. A phase 2 trial of one such therapy failed to show significant improvement over placebo. Both remain options for refractory cases, but expectations should be measured.
The Role of Coexisting Conditions
Post-traumatic headache rarely exists in isolation. Sleep problems are extremely common after head injury and directly worsen headache frequency and severity. Treating insomnia, whether through sleep hygiene changes or short-term use of melatonin, often improves headache outcomes as well.
PTSD deserves special attention. The relationship between PTSD and persistent headache appears to run in both directions: trauma symptoms heighten pain sensitivity, and chronic pain increases psychological distress. Addressing PTSD through appropriate therapy can meaningfully reduce headache burden, and ignoring it makes headache-specific treatments less effective. Dizziness, neck pain, and mood symptoms also commonly overlap and may each need their own management track for headaches to fully improve.