Migraine and Concussion: Post-Traumatic Headache and Vestibular Symptoms

Concussion, a mild traumatic brain injury caused by a blow to the head or a jolt that causes the brain to move rapidly within the skull, is one of the most common causes of new-onset headache in young adults and a significant trigger for migraine-like headaches in people with or without a prior migraine history. The relationship between concussion and migraine is clinically important because post-traumatic headache is the most common and often most debilitating symptom of concussion, and understanding the overlap between post-traumatic headache and migraine is essential for appropriate diagnosis and management.

What Happens in the Brain During Concussion

Concussion produces a complex neurometabolic cascade that disrupts normal brain function without necessarily causing structural damage visible on standard imaging. The mechanical forces of the concussive impact trigger a sudden, widespread ionic flux in neurons that resembles cortical spreading depression in its pattern of neuronal activation followed by suppression.

This ionic disruption requires significant energy to restore, creating a period of increased metabolic demand in the brain at a time when cerebral blood flow may be reduced. The resulting energy crisis produces the acute symptoms of concussion and may leave the brain in a state of neurological vulnerability that persists long after the initial injury.

Post-Traumatic Headache and Migraine

Post-traumatic headache, defined as headache developing within seven days of a head injury, is the most common symptom following concussion and occurs in sixty to ninety percent of people who sustain concussion. The headache most commonly has features of migraine or tension-type headache.

Post-traumatic headache with migraine features responds better to migraine-specific treatments than to non-specific analgesics, and people who develop post-traumatic headache with migraine characteristics benefit from evaluation and treatment by a provider familiar with migraine as well as concussion management.

Vestibular Symptoms After Concussion

Vestibular symptoms including dizziness, balance problems, and motion sensitivity are the second most common complaint after concussion, affecting approximately thirty to fifty percent of people following head injury. Post-concussion vestibular dysfunction may result from peripheral vestibular injury affecting the inner ear structures, central vestibular pathway disruption in the brainstem and cerebellum, or the activation or worsening of pre-existing vestibular migraine.

Return to Activity and Migraine

Premature return to cognitively or physically demanding activities following concussion may worsen and prolong post-traumatic headache. The neurometabolic vulnerability of the post-concussion brain is sensitive to physical and cognitive stressors that increase metabolic demand before the energy crisis has resolved.

Vestibular rehabilitation, performed by a physical therapist trained in concussion and vestibular disorders, can address the vestibular component of post-concussion symptoms and may reduce both dizziness and headache frequency.

Long-Term Outlook

Most people with post-traumatic headache following concussion improve over weeks to months with appropriate rest, graduated return to activity, and migraine-specific treatment when features of migraine are present. A subset develop persistent post-traumatic headache that lasts beyond three months, which is classified as a distinct headache disorder requiring more intensive evaluation and management. People with a pre-existing migraine history who sustain concussion are at higher risk for persistent post-traumatic headache.