According to webmd.com, here’s How Your Blood Type Can Affect Your Health

Stomach Cancer

A, AB, and B blood types are more at risk than type Os. Specifically, people with type A blood are more likely to get stomach cancer. Researchers think this might be because H. pylori infection is more common in people with type A blood. That’s a bacteria that’s usually found in the stomach. It can cause inflammation and ulcers.

Ulcers

Peptic ulcers — painful open sores that crop up in the lining of your stomach or upper intestine — seem to happen more often with blood type O.

Blood Clots