Migraines can cause far more than intense head pain. They affect cardiovascular health, brain structure, mental health, sleep, cognitive function, and vision. Some of these effects are temporary and resolve between attacks, while others carry long-term health implications that build over years of living with the condition.
Stroke and Vascular Risk
The most serious complication migraines can cause is an increased risk of stroke, particularly for people who experience aura (visual disturbances, numbness, or other sensory changes before the headache). People with migraine with aura have roughly double the risk of ischemic stroke compared to those without migraines. Migraine without aura, by contrast, barely raises that risk at all.
In rare cases, a stroke can happen during a migraine aura itself. This is called migrainous infarction, and it occurs when an aura symptom persists for longer than 60 minutes and brain imaging confirms actual tissue damage in the corresponding area of the brain. This complication occurs most often in younger women and typically affects the back of the brain, which handles vision. It’s uncommon, but it’s the reason any aura that lasts significantly longer than usual warrants urgent medical attention.
Cardiovascular Problems
Beyond stroke, migraines are linked to broader cardiovascular disease. A large cross-sectional study found that people with migraines or severe headaches had nearly three times the odds of having cardiovascular disease compared to those without. The association was strongest for stroke (about 3.8 times the odds) and significant for angina, the chest pain caused by reduced blood flow to the heart (about 2.3 times the odds). Interestingly, coronary heart disease itself did not show a meaningful link, suggesting migraines may affect blood vessels in specific ways rather than accelerating heart disease across the board.
Changes in Brain Structure
MRI scans of migraine patients frequently reveal small bright spots in the brain’s white matter. In one study of 263 migraine patients, nearly 64% had these spots, which are sometimes called white matter hyperintensities. They appeared most often in the frontal lobe (about 94% of those with spots) and were typically tiny, round, and punctate rather than large or spreading.
The clinical significance of these spots is still debated. Unlike the lesions seen in conditions such as multiple sclerosis or small vessel disease, the spots in migraine patients tend to be smaller, non-confluent, and invisible on certain types of imaging that would highlight more serious damage. They don’t appear to cause obvious neurological symptoms on their own, but their presence can complicate diagnosis when doctors are trying to rule out other conditions.
Depression and Anxiety
Migraines and mood disorders frequently travel together. Among adults with migraines in a national population study, 11.2% had depression, 14.6% had anxiety, and 13.7% had both conditions simultaneously. These rates are significantly higher than in the general population, and the relationship runs in both directions: depression and anxiety make migraines worse, and frequent migraines increase the likelihood of developing mood disorders. The combination substantially reduces quality of life beyond what either condition causes alone.
Sleep Disruption
Sleep disorders and migraines reinforce each other in a cycle that can be difficult to break. People with sleep disorders have about 59% higher risk of developing migraines. Insomnia has the strongest connection, raising migraine risk by roughly 79%. Sleep apnea also increases risk, though to a lesser degree (about 25%). Poor sleep lowers the threshold for a migraine attack, and the pain and discomfort of migraines make restful sleep harder to achieve.
Cognitive Effects
The “brain fog” that migraine sufferers describe is measurable. During attacks, studies consistently find declines in processing speed, working memory, attention, and executive function. People take longer to complete tasks that normally feel automatic, struggle to hold information in short-term memory, and have difficulty shifting between different types of thinking.
What surprises many people is that cognitive effects persist between attacks as well. Even during headache-free periods, migraine patients perform worse on tests of verbal and visual memory, information processing speed, and sustained attention compared to people without migraines. Those who experience aura tend to show more pronounced deficits in attention and rapid processing. People with chronic migraine (15 or more headache days per month) show particular difficulty with cognitive flexibility, the ability to adapt thinking strategies when circumstances change.
The Extended Migraine Timeline
A migraine attack lasts far longer than the headache phase alone, and each phase causes its own set of symptoms. The prodrome phase begins hours to days before the headache, bringing neck stiffness, fatigue, and sensitivity to light and sound. Many people don’t recognize these early symptoms as part of the migraine itself, which means the attack is already affecting daily function before any pain starts.
After the headache resolves, the postdrome phase can linger for up to 48 hours. Common postdrome symptoms include difficulty concentrating, fatigue, and neck stiffness. This is the “migraine hangover” that leaves people feeling drained and mentally sluggish even though the pain is gone. A single migraine attack, then, can disrupt several days of normal functioning when all phases are counted.
Vision Complications
Retinal migraine causes temporary vision loss or blind spots in one eye. These episodes typically resolve completely, but in rare documented cases, patients develop permanent visual blind spots after repeated attacks. Standard definitions of retinal migraine don’t always account for these lasting changes, which means some people with progressive visual symptoms may not realize their migraines are responsible. Any episode of vision loss in one eye, even if brief, should be evaluated to rule out other vascular causes.