Blood Type May Affect Stroke Risk, Brigham and Women's Hospital Study

Your blood type might affect your risk for stroke. People with AB and women with B were a little more likely to suffer one than people with O blood — the most common type, a study found. The research can't prove such a link. But it fits with other work tying A, B and AB to more risk of blood clots in the legs and heart attacks. Blood type O also has been tied to an increased risk of bleeding, which implies less chance of clots, the cause of most strokes.