Can a Traumatic Brain Injury Cause Migraines?

Traumatic brain injury is one of the most well-documented triggers of new-onset migraines. In a large prospective study, roughly half of all headaches that developed after mild TBI met criteria for migraine or probable migraine, making the migraine-like pattern the single most common type of post-traumatic headache. The relationship is not coincidental or poorly understood: identifiable changes in brain chemistry and neural signaling connect the physical impact to the pain that follows. What makes post-traumatic migraines tricky is that they look a lot like regular migraines but do not always respond to the same treatments, and they often come bundled with sleep problems, mood changes, and other post-concussion symptoms that can make the whole picture harder to untangle.

How Common Are Migraines After a Head Injury

The numbers are striking and consistent across studies. In a prospective study that tracked over 200 people after mild TBI, about half of those who developed headaches had migraines or probable migraines, and around 40 percent had tension-type headaches. The cumulative incidence of any new or worsened headache over one year reached 91 percent.¹ A separate large study from the TRACK-TBI consortium found that about 60 percent of people with mild TBI reported headache at two weeks post-injury.²

Among those who developed headache in the TRACK-TBI study, roughly half still had it at three months. That number dropped over time but did not vanish: about 29 percent continued to report headache at a full year after injury.² When the headache phenotype is characterized, migraine consistently emerges as the most frequent type, appearing in up to 38 percent of headache-reporting participants in one study, with probable migraine adding another 25 percent on top of that.³

An important nuance: the severity of the head injury does not reliably predict whether you will develop migraines afterward. Mild TBI, which accounts for the vast majority of traumatic brain injuries, is actually the category most strongly associated with post-traumatic headache. This is partly a numbers game since mild TBIs are far more common, but it also reflects a real biological pattern that researchers are still working to fully explain.

What Happens in the Brain to Trigger Migraines

The short version is that a head impact sets off a cascade of chemical and electrical changes that activate the same pain pathways responsible for ordinary migraines. The details are worth knowing because they explain why these headaches can persist long after the original injury has apparently healed.

One major player is cortical spreading depolarization, a slow wave of intense electrical activity that sweeps across brain tissue. It is the same phenomenon that produces the visual aura some migraine sufferers experience, and it happens reliably after acute brain injury. In animal studies, even a single episode of spreading depolarization is enough to ramp up inflammatory signaling molecules and a neuropeptide called CGRP in the brain’s cortex.⁴ That matters because CGRP is one of the central molecules in migraine pain. It dilates blood vessels and sensitizes pain-signaling neurons in the trigeminal system, which is the network that carries headache pain from the head and face to the brain.

Research on concussion confirms that spreading depolarization occurs within minutes of impact and may persist with repeated injuries.⁵ When head injuries are repeated, as in contact sports, CGRP levels in the brainstem pain system rise significantly and stay elevated for at least a week after the last injury. A single impact produced a temporary bump in CGRP, but repeated hits on consecutive days drove a sustained increase that persisted well beyond the acute period.⁶

Beyond CGRP, TBI releases a flood of other substances that promote hyperexcitable neurons, disrupt normal synaptic communication, and in the long run can support ongoing nerve degeneration.⁷ This is why the pain system does not simply reset once the bruise heals. The injury creates lasting changes in how pain signals are processed.

How CGRP Drives the Shift from Acute to Chronic

Most post-traumatic headaches resolve within weeks or months. But for roughly a quarter to a third of people, the headaches persist past three months and become a chronic condition. The mechanism behind this shift involves central sensitization, where the brain’s pain-processing circuits become permanently dialed up so that stimuli that would not normally cause a headache now trigger one.

Animal research has shown that CGRP is not just involved in the acute headache after a head injury but also drives the development of this sensitized state, making the brain increasingly vulnerable to headache triggers over time.⁸ In other words, the same molecule that fires up the initial headache also rewires the pain system in ways that keep it firing. Once that rewiring takes hold, the headache can become self-sustaining even though the original brain injury has healed.

Young people with a migraine-like post-traumatic headache pattern tend to take longer to recover than those whose headache resembles a tension-type pattern. In one study of concussed youth, the migraine group had a median recovery time of 95 days compared to 70 days for the non-migraine group.⁹ This suggests that the migraine phenotype may be a marker for a more deeply sensitized pain state, not just a different flavor of headache.

Who Is Most Likely to Develop Post-Traumatic Migraines

Several factors appear to increase the risk, and sex is one of the most consistent. Women and girls are more likely to report headaches and migraines after concussion, and female athletes with a pre-existing migraine history are at particular risk for prolonged recovery.¹⁰ Interestingly, this effect was not significant for boys and men with the same migraine history, pointing to a possible interaction between hormonal factors and post-traumatic headache susceptibility.¹¹

Having migraines before the injury is a risk factor in general, not just for getting post-traumatic migraines but for having a harder recovery overall. If your brain was already prone to the electrical and chemical patterns that produce migraines, a head injury hands it a powerful new trigger.

Genetics also plays a role. A study of children with post-traumatic headache identified specific genetic variants associated with headache severity, some of which overlap with known migraine-risk genes. Two of these variants remained significant even after strict statistical correction.¹² This is early-stage research, but it raises the possibility that some people are genetically set up to develop worse headaches after head trauma, in the same way that some people are genetically predisposed to migraines in general.

The PTSD and Sleep Connection

Post-traumatic migraines rarely arrive alone. Two of the most common companions are post-traumatic stress disorder and disrupted sleep, and both appear to make the headaches worse through overlapping biological pathways.

In people with persistent post-traumatic headache, the relationship between PTSD symptoms and pain severity depends on the headache type. Those with tension-type headache symptoms showed a positive correlation between PTSD severity and pain, while those with migraine-like symptoms showed a negative correlation, which is a counterintuitive finding that likely reflects different underlying pain mechanisms rather than meaning PTSD somehow helps migraines.¹³ What is clear is that the presence of PTSD complicates treatment and recovery for both headache types.

Sleep disruption, which is extremely common after TBI, has a two-way relationship with headache. Poor sleep worsens headaches, and headaches disrupt sleep. One proposed explanation involves the glymphatic system, a waste-clearance mechanism that operates primarily during sleep. If TBI damages glymphatic function and sleep disruption further reduces its activity, pain-related molecules like CGRP may not be cleared efficiently from brain tissue, keeping the headache cycle going.¹⁴ This is still a hypothesis, but it fits neatly with what is known about how CGRP accumulation drives headache persistence.

Animal research reinforces the PTSD-headache connection more directly: rats exposed to a model of traumatic stress developed dramatically lower pain thresholds, and when combined with a headache-inducing agent, the pain sensitivity was worse and lasted longer than with either stress or the headache trigger alone.¹⁵

How Post-Traumatic Migraines Show Up on Brain Scans

Standard MRI or CT scans after mild TBI usually look normal, which is part of what makes post-traumatic headache frustrating for patients. But more specialized imaging techniques reveal measurable differences in brain structure that correlate with migraine-like symptoms.

Diffusion tensor imaging, which maps the integrity of white matter tracts, has shown that people with post-traumatic migraines have reduced structural integrity in the corpus callosum, the thick bundle of fibers connecting the two brain hemispheres, and in circuits connected to the hippocampus. Damage to these hippocampal-connected tracts correlated with worse visual memory performance, suggesting the headaches are not occurring in a vacuum but alongside broader cognitive effects.¹⁶

A more recent study comparing people with persistent post-traumatic headache, ordinary migraine, and healthy controls found that the post-traumatic group had distinct white matter characteristics: higher structural measures in the internal capsule and corona radiata, but lower measures in the corpus callosum, compared to the migraine group. The corpus callosum changes correlated with the severity of post-concussive symptoms overall.¹⁷ This is evidence that even though post-traumatic migraines and ordinary migraines feel similar to the person experiencing them, they involve partly different patterns of brain disruption.

These imaging findings are not yet used in routine clinical diagnosis, but they help explain why treatments that work well for ordinary migraines sometimes fall short for post-traumatic ones. They also strengthen the case that post-traumatic headache is a genuine neurological condition, not a psychological complaint or an exaggeration.

Autonomic Symptoms and the Wider Nervous System

People with persistent post-traumatic headache often report symptoms that go well beyond the head: dizziness, rapid heartbeat, temperature regulation problems, and other signs that the autonomic nervous system is not working normally. A study comparing people with persistent post-traumatic headache to people with ordinary migraine and healthy controls found that autonomic dysfunction symptoms were greatest in the post-traumatic headache group. The number of lifetime traumatic brain injuries a person had experienced was associated with more autonomic dysfunction, and those with a higher headache burden had more problems specifically with blood vessel regulation.¹⁸

This matters practically because autonomic symptoms can be mistaken for anxiety, deconditioning, or separate medical problems if the clinician is not thinking about post-traumatic headache as a condition that involves the whole nervous system. If you are having dizziness, exercise intolerance, or temperature sensitivity along with your post-TBI migraines, these may all be branches of the same tree.

Why Treatment Is Complicated

You might assume that since post-traumatic migraines look like regular migraines, the medications that work for regular migraines would work here too. That assumption has taken some hits. A phase 2 clinical trial of fremanezumab, an antibody that blocks CGRP (a drug class that has been effective for ordinary migraines), failed to show significant benefit for post-traumatic headache.¹⁹ This was a surprise, given how central CGRP is to the biology of post-traumatic headache. One interpretation is that blocking CGRP alone is not enough when multiple pain pathways have been activated by the injury. Botulinum toxin (Botox), which affects several pain-signaling mechanisms simultaneously, has shown more promise and is being studied as a potentially better-suited option for this population.

The current expert consensus favors a combination approach. An American Headache Society white paper on treating post-traumatic headache in youth recommended a collaborative care model that includes acute and preventive medications, physical therapy, graded physical activity, and behavioral health support.²⁰ A systematic review of non-drug approaches echoed this, finding that the best outcomes came from combining pharmacological treatment with interventions like neuromodulation, physical therapy, and cognitive-behavioral therapy.²¹

In practice, this means that if you are dealing with post-TBI migraines, a single-pill solution is less likely to resolve the problem than it might be for someone with ordinary migraines. Physical rehabilitation, sleep hygiene, management of co-occurring mood or stress symptoms, and sometimes direct treatment of neck problems all tend to be part of an effective plan.

The Cervicogenic Overlap

Not every post-traumatic headache is a migraine, even when it feels like one. Cervicogenic headache, pain that originates from the neck, accounted for up to 10 percent of headaches in one characterization study.³ This matters because neck injuries often co-occur with head injuries, especially in car accidents and contact sports. A cervicogenic headache can mimic migraine symptoms closely, including one-sided pain, nausea, and sensitivity to light. If the neck component is not identified, migraine-specific treatments may not help much. Physical therapy targeting the cervical spine can sometimes resolve or reduce what initially appears to be a post-traumatic migraine.

Post-traumatic headache is increasingly recognized as a heterogeneous disorder. Patients can present with migraine-like, tension-type, cervicogenic, or mixed patterns, and these subtypes may respond to different therapies.²² The current diagnostic criteria from the International Headache Society define post-traumatic headache primarily by its timing relative to the injury (within seven days) and acknowledge that there are no clinical features unique to it, meaning the pain itself cannot be distinguished from other headache types on symptoms alone.²³ Getting the subtype right is not academic; it determines which combination of treatments has the best shot at working.

The Economic and Quality-of-Life Toll

Post-traumatic headache is recognized as a disabling condition with considerable effects on quality of life and economic impact, though the research documenting these effects is thinner than what exists for other headache disorders like migraine without a traumatic trigger.²⁴ People with persistent post-traumatic headache often describe a compounding burden: the headaches limit work capacity, exercise tolerance, social activities, and cognitive function, and these limitations feed back into the comorbid conditions (anxiety, depression, sleep dysfunction) that worsen the headaches themselves.

For veterans and athletes, the legal and occupational dimensions add another layer. Documenting the connection between a specific injury and the ongoing headache disorder is complicated by the fact that standard imaging often looks normal and the symptoms overlap with pre-existing conditions. This can create frustrating cycles of contested disability claims or return-to-play decisions made without adequate headache management. If you are navigating this process, getting a proper headache subtype diagnosis and keeping detailed symptom records from the earliest point after injury can make a meaningful difference.