Migraine Linked to Blood Clots in Veins

People with migraine may be more likely to develop blood clots in their veins than those without, according to a study published today. Called venous thrombosis or thromboembolism, the blood clots can lead to strokes. Researchers speculate this is why people with migraine have a greater risk of stroke.

Studies of stroke and migraine implicate only people who have visual auras with their migraines. I wonder what migraine types the blood clot study participants had.

From Science Daily:

Of the [574] participants, 111 people had migraine. A total of 21 people with migraine also had one or more instances of venous thrombosis, or 19 percent. In comparison, 35 people without migraine had the condition, or 8 percent.

Researchers do not know why migraine and venous thrombosis are linked. One theory is that the blood of people with migraine may be more prone to clotting.

The study also found that people with migraine are not more likely to have hardening or narrowing of the arteries, which is contrary to a current theory.