Blood types refer to a classification of blood based on substances present on your red blood cells. The four basic blood ...

It causes your marrow to make too many red blood cells so your blood is too thick. You may be more likely to have clots, a stroke, or a heart attack. This disease gets worse slowly, usually over ...

Not to B-negative, but your blood type could offer a clue to your risk of having a stroke before 60. “The number of people with early strokes is rising,” said Dr. Steven J. Kittner ...

A finger-prick blood test to diagnose the deadliest form of stroke might be twice as effective at spotting it than using a patient's symptoms alone. The test, which works similarly to a lateral ...

Sometimes blood clots lead to a heart attack or stroke. Treatments lower the number of red blood cells and prevent blood clots. They also relieve other symptoms, like headaches and vision problems.