According to a new meta-analysis led by University of Maryland School of Medicine researchers, a person’s blood type may be linked to their risk of having an early stroke. The meta-analysis included all available data from genetic studies focusing on ischemic strokes, which are caused by a blockage of blood flow to the brain, occurring in younger adults under age 60. The study found that people with early stroke were more likely to have blood type A and less likely to have blood type O (the most common blood type) — compared to people with late stroke and people who never had a stroke. Both early and late stroke were also more likely to have blood type B compared to controls. After adjusting for sex and other factors, researchers found those who had blood type A had a 16% higher risk of having an early stroke than people with other blood types. Those who had blood type O had a 12% lower risk of having a stroke than people with other blood types.
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