Add Yahoo as a preferred source to see more of our stories on Google. Close-Up Of Donated Blood In Bag Your blood type affects everything, from a predisposition to certain diseases to your heart ...

Ever wondered why that one friend gets the stomach flu almost every year, while the rest of your friends are totally fine? Or why your partner never seems to contract the illness, even when you do?

Most people don’t spare a thought for their blood type unless they’re in need of a transfusion — but could yours hold secrets to your health? There are four main blood types: A, B, AB and O.

Blood type is usually determined during hospital visits, especially when a transfusion may be needed, such as in surgery or childbirth. [File, Standard] Many of us first learned our blood types during ...