Headaches are the single most common symptom after a head injury, affecting roughly half of all people who sustain a traumatic brain injury regardless of severity. A large meta-analysis pooling data across studies found a pooled prevalence of about 49%, and in mild injuries like concussions the rate climbs even higher, with one study reporting that 92% of concussion patients experienced headache within the first week.1PubMed Central. Prevalence of Headache Following Traumatic Brain Injury: A Systematic Review and Meta-Analysis2PubMed Central. Revisiting the ICHD-3 criteria for headache attributed to mild traumatic injury to the head: Insights from the Toronto Concussion Study What makes post-traumatic headache especially frustrating is its tendency to linger: for many people it resolves within weeks, but for a substantial minority it becomes a persistent problem that reshapes daily life for months or longer.
How Often Headaches Develop and How Long They Last
In the immediate aftermath of a head injury, headache is almost expected. A large European study of over 2,200 patients found that about 59% reported headache at the time they enrolled in the study shortly after injury. More telling is what happened over time: more than a quarter still had headaches a full year later.3PubMed. Frequency and predictors of headache in the first 12 months after traumatic brain injury: results from CENTER-TBI That one-year figure is consistent with broader literature recognizing that post-traumatic headache can persist well beyond twelve months after the initial impact.4PubMed Central. Post-Traumatic Headache: A Review of Prevalence, Clinical Features, Risk Factors, and Treatment Strategies
The timing of onset tends to be swift. In a concussion cohort studied in Toronto, 94% of those who developed headache said it started on the day of the injury or the day after. Most experienced daily headache in those early weeks.5PubMed Central. Revisiting the ICHD-3 criteria for headache attributed to mild traumatic injury to the head: Insights from the Toronto Concussion Study That near-immediate onset matters for a practical reason: if a new headache pattern starts days or weeks after a head injury rather than right away, it may still be related to the trauma, but your doctor will want to consider other explanations as well.
What These Headaches Actually Feel Like
Post-traumatic headache is not a single type of pain. It borrows features from headache types you may already know, primarily migraine and tension-type headache, and sometimes both at once. In one study of adolescents and young adults, the most common pattern was actually a mix of both migraine-like and tension-type features, seen in about 40% of patients. Purely migraine-like headache came next at 36%, and purely tension-type at 15%.6Frontiers in Neurology. Characterization of persistent post-traumatic headache and management strategies in adolescents and young adults following mild traumatic brain injury In the Toronto concussion cohort, pressure or squeezing pain predominated in about 69% of patients, while throbbing or pulsing pain appeared in about 22%.7PubMed Central. Revisiting the ICHD-3 criteria for headache attributed to mild traumatic injury to the head: Insights from the Toronto Concussion Study
This distinction is more than academic. People whose post-traumatic headache resembles migraine tend to report that bright light and mental effort make the pain worse, while quiet rest helps. Those with a more tension-type pattern report that stress and nervousness aggravate their headache, and over-the-counter anti-inflammatory medications provide better relief. The two subgroups also differ on sensory testing: tension-type patterns show more pronounced sensitivity to pressure on the head and reduced sensitivity to temperature changes.8PubMed Central. Different clinical phenotypes of persistent post-traumatic headache exhibit distinct sensory profiles Recognizing post-traumatic headache as a collection of subtypes rather than one uniform condition has shifted how specialists think about treatment.9The Lancet Neurology. Post-traumatic headache: epidemiology and pathophysiological insights
Why a Head Injury Causes Headaches
The mechanisms are still being worked out, but inflammation appears to be at the center. When the brain is injured, even mildly, an inflammatory response kicks in almost immediately. That response is initially protective, helping to repair damaged tissue. The problem is that inflammation can persist well beyond its useful window, altering how nerve cells fire, disrupting the integrity of nerve fibers, and changing how pain signals are processed in the brain.10PubMed Central. Traumatic brain injury, neuroinflammation, and post-traumatic headaches Animal studies point specifically to inflammation activating the neural systems associated with migraine, which helps explain why so many post-traumatic headaches look migraine-like.11PubMed Central. Pathophysiological links between traumatic brain injury and post-traumatic headaches
Beyond inflammation, the injured brain faces an energy crisis. The impact triggers a sudden flood of ions and neurotransmitters across cell membranes, and restoring normal balance demands enormous energy from cells that are already struggling. This metabolic mismatch is thought to underlie the migraine-like symptoms, the vulnerability to a second injury during recovery, and the cognitive fog that often accompanies post-traumatic headache.12PubMed Central. The new neurometabolic cascade of concussion
There is also evidence of long-lasting changes in how pain signals travel through the brain. Research using animal models has found that head injury causes measurable changes in pain-related chemicals across multiple levels of the trigeminal system, the main pathway carrying pain signals from the face and head to the brain. These changes correlate with heightened skin sensitivity on the face, a phenomenon called allodynia where normally painless touch becomes painful.13PubMed Central. Trigeminal neuroplasticity underlies allodynia in a preclinical model of mild closed head traumatic brain injury (cTBI) Molecules like calcitonin gene-related peptide (CGRP) and nitric oxide synthase, both heavily studied in migraine research, appear to play important roles in this sensitization process after head injury as well.14PubMed Central. Trigeminal Pain Molecules, Allodynia, and Photosensitivity Are Pharmacologically and Genetically Modulated in a Model of Traumatic Brain Injury
The Neck Is Often Part of the Problem
Many head injuries, particularly those from falls, car accidents, and sports collisions, also injure the neck. This overlap is easy to overlook but clinically important. Following whiplash injury, about 90% of patients report head or neck pain along with dizziness, sleep problems, and anxiety.15PubMed Central. An update on the management of post-traumatic headache Some researchers argue that neck injury is the most common driver of post-traumatic headache. The proposed mechanisms include structural damage from rapid neck extension, the development of painful muscle knots (trigger points), and a convergence of pain signals from the upper neck and the trigeminal nerve system that serves the head.16PubMed. The relationship of neck injury and post-traumatic headache
This matters for treatment because a headache that is primarily driven by a cervical spine problem responds differently than one driven by brain inflammation. If your headaches are concentrated at the back of the head, worsened by certain neck positions, or accompanied by neck stiffness and reduced range of motion, a cervicogenic component is worth investigating. Physical therapy targeting the neck can be effective in these cases, whereas medications aimed at migraine mechanisms alone may not fully address the pain.
Who Is at Greater Risk of Persistent Headache
Most post-traumatic headaches resolve within the first few months. But for a meaningful fraction of people, they become chronic. Identifying who is at higher risk can guide more aggressive early treatment. The TRACK-TBI study, a major U.S. research effort, found that risk factors for persistent post-traumatic headache included being female, having fewer years of formal education, and having a history of migraine before the injury.17PubMed. Prevalence of and Risk Factors for Post-traumatic Headache in Civilian Patients After Mild Traumatic Brain Injury: A TRACK-TBI Study Another study confirmed female sex as a risk factor and added that having a headache at the emergency department visit itself predicted chronification.18Emergency Medicine Journal. Risk factors and outcomes associated with post-traumatic headache after mild traumatic brain injury
A pre-existing history of migraine deserves special attention. People who already have migraine circuitry that fires too easily seem to be primed for a head injury to push those circuits into a more sustained pattern. This does not mean that people without a migraine history are safe from persistent headache, just that the odds increase if migraine is already in the picture. Similarly, the severity of the brain injury itself does not cleanly predict who gets headaches. Mild injuries are actually more likely to produce persistent headache than severe ones, a counterintuitive finding that researchers attribute to different patterns of recovery, treatment, and possibly reporting.
The Headache-Type Matters for Recovery in Young People
Research in children and adolescents has found that the type of headache that develops after a concussion predicts how long recovery will take. In a study of youth concussion patients, those whose post-traumatic headache resembled migraine took substantially longer to recover than those whose headache was non-migraine-like, with a median recovery time of 95 days versus 70 days. The migraine-like group was also about three times more likely to still have headache at three months after injury.19JAMA Network Open. Evaluation of Posttraumatic Headache Phenotype and Recovery Time After Youth Concussion These findings suggest that identifying the headache subtype early, rather than treating all post-concussion headache the same way, could help clinicians set better expectations and tailor management plans for young patients.
Anxiety, Depression, and the Emotional Side
Post-traumatic headache rarely travels alone. It frequently shows up alongside anxiety, depression, post-traumatic stress disorder, and cognitive difficulties, and the overlap is stark. In one study comparing people with persistent post-traumatic headache to healthy controls, more than half the headache group screened positive for probable or high-risk anxiety, compared to 8% of controls. Depression risk was elevated too: 42% in the persistent headache group versus 2% in controls. About a quarter of the patients showed mild cognitive impairment, and 10% had probable PTSD.20PubMed Central. Psychiatric and cognitive comorbidities of persistent post-traumatic headache attributed to mild traumatic brain injury
What makes this especially tricky is that the relationship runs in both directions. Anxiety and depression can lower your pain threshold, making headaches feel worse and last longer. At the same time, living with chronic headache drives mood problems. Clinicians who treat only the headache without addressing the emotional component tend to get poorer outcomes, and the reverse is also true. Interestingly, the connection between psychological distress and headache severity differs by headache type: one study found that PTSD severity correlated with worse headache pain in the tension-type group but actually correlated with less pain in the migraine-like group, suggesting that the underlying biology differs between these subtypes.21PubMed Central. Different clinical phenotypes of persistent post-traumatic headache exhibit distinct sensory profiles
Sleep Disruption and the Feedback Loop
Poor sleep is another hallmark of the post-head-injury period, and it feeds directly into the headache problem. Research shows a reciprocal relationship: people with disrupted sleep after brain injury report more headaches, and people with post-traumatic headaches are at higher risk of developing sleep disturbances. One proposed explanation involves the brain’s waste-clearance system, the glymphatic pathway, which is most active during sleep. When sleep is disrupted after head injury, glymphatic function may be impaired, potentially allowing pain-related molecules like CGRP to accumulate rather than being cleared efficiently.22PubMed. Linking Traumatic Brain Injury, Sleep Disruption and Post-Traumatic Headache: a Potential Role for Glymphatic Pathway Dysfunction This creates a vicious cycle: the injury disrupts sleep, poor sleep worsens headache, and worsening headache further disrupts sleep. Addressing sleep quality early in recovery, whether through sleep hygiene improvements or, when necessary, medical treatment for insomnia, can be one of the more impactful things you do for your headache.
Treatment Approaches
Because post-traumatic headache borrows so heavily from the biology of migraine and tension-type headache, treatment largely draws from the same toolbox used for those conditions, adapted to the subtype that best fits a given patient’s symptoms. For immediate headaches in the first days and weeks, standard over-the-counter pain relievers are often the first step. However, there is a real risk of overusing acute pain medications, which can lead to a separate problem: medication-overuse headache. Taking analgesics too frequently, generally more than two to three days per week, can paradoxically increase headache frequency and lock in a chronic pattern. Anyone whose head-injury headache is not resolving within a few weeks should discuss a preventive strategy with their doctor rather than relying on round-the-clock pain relief.
For patients whose headache persists and resembles migraine, newer therapies targeting CGRP are generating the most interest. In an open-label study of 100 people with persistent post-traumatic headache averaging nearly 16 moderate-to-severe headache days per month, treatment with the CGRP-blocking antibody erenumab reduced moderate-to-severe headache days by about 2.8 per month, with 28% of patients achieving at least a 50% reduction.23PubMed Central. Efficacy, tolerability, and safety of erenumab for the preventive treatment of persistent post-traumatic headache attributed to mild traumatic brain injury: an open-label study A smaller case series reported a mean reduction in headache intensity of about 51% with no adverse events.24PubMed Central. Models for Treating Post-traumatic Headache These are early results from non-randomized studies, so they should be taken as promising signals rather than definitive evidence, but they do align well with what we know about CGRP’s role in the underlying biology.
Non-drug approaches have their own evidence base. Exercise and physical therapy are commonly recommended and have a physiological rationale: physical activity can reduce brain inflammation and oxidative stress, while physical therapy can maintain neck mobility and eliminate cervicogenic headache triggers.25PubMed Central. Update on Non-Pharmacological Interventions for Treatment of Post-Traumatic Headache The trick with exercise after a head injury is timing and intensity. Current thinking favors a gradual return to sub-symptom-threshold aerobic activity, meaning light exercise that does not worsen your symptoms, starting within days of injury rather than strict rest. Cognitive behavioral therapy can address the anxiety and depression that amplify the headache experience, and techniques like mindfulness and biofeedback are also under study.
Impact on Work and Daily Functioning
The practical toll of post-traumatic headache extends well beyond pain itself. Getting back to work is one of the biggest milestones after a head injury, and headache is one of the biggest obstacles to reaching it. Research has found that each unit increase on a standard pain rating scale more than cut the odds of successful return to work in half.26The Journal of Head Trauma Rehabilitation. Posttraumatic Headache and Its Impact on Return to Work After Mild Traumatic Brain Injury A follow-up study over one year confirmed that patients with persistent post-traumatic headache had worse return-to-work outcomes overall.27PubMed Central. Post-traumatic headache after mild traumatic brain injury in a one-year follow up study – risk factors and return to work
This is partly because the headache does not exist in isolation. The combination of head pain, light sensitivity, difficulty concentrating, fatigue from poor sleep, and mood disturbance creates a constellation of symptoms that together make sustained cognitive work extremely difficult. Employers and schools that understand this combination and offer graduated return schedules, reduced screen time, flexible hours, or modified workloads tend to see better outcomes than those that treat the injury as a simple on/off recovery.
What Brain Imaging Reveals
Standard CT and MRI scans after a mild head injury typically come back looking normal, which can be a source of confusion and frustration for patients who are clearly suffering. But advanced imaging techniques tell a different story. Diffusion tensor imaging, which maps the structural integrity of the brain’s white matter tracts, has revealed abnormalities in patients with persistent post-traumatic headache. One study found significant changes in two specific white-matter bundles closely tied to pain processing and emotional regulation.28PubMed Central. Pain-related white matter tract abnormalities in mild traumatic brain injury patients with persistent headache
A larger and more recent study comparing 100 people with persistent post-traumatic headache, 293 with migraine, and 154 healthy controls found that the post-traumatic headache group had distinct white-matter signatures that set them apart from both migraine patients and healthy individuals. The structural differences in certain tracts correlated with the number of monthly migraine-like headache days and with overall post-concussive symptom severity.29PubMed Central. White matter tract differences in persistent post-traumatic headache, migraine, and healthy controls: a diffusion tensor imaging study These findings are not yet used in routine clinical care, but they do two valuable things: they validate that the headache has a physical basis in the brain, and they point toward biomarkers that could eventually help predict who is at risk for chronic headache after a head injury.
When to Seek Urgent Care
While the headaches described throughout this article are common and usually manageable, some headache patterns after a head injury signal a medical emergency. A headache that gets progressively worse rather than gradually improving, especially within hours or days of the injury, can indicate bleeding inside the skull. Other warning signs include repeated vomiting, seizures, confusion or difficulty staying awake, one pupil being larger than the other, weakness or numbness in a limb, slurred speech, or a headache that becomes the worst you have ever experienced. Any of these paired with a recent head injury warrants an emergency department visit, not a wait-and-see approach. Even in the absence of red flags, a headache that has not improved at all by four to six weeks after a mild injury is worth discussing with a healthcare provider, because that is the window where early intervention has the best chance of preventing the headache from becoming a long-term fixture.