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Heart Disease

There’s good news for O blood types. Research shows your risk of coronary heart disease tends to be lower. Experts aren’t sure why. Some think it might be because other types are more likely to have higher cholesterol and higher amounts of a protein that’s linked to clotting.

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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.

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Memory

A small study showed that people with memory problems had type AB blood more than any other.

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Pancreatic Cancer

Your risk is higher if you’re type A, AB, or B. Molecules in type A and B red blood cells help certain bacteria called H. pylori grow in your gut. It can make you more likely to get pancreatic cancer.

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Stress

Stress boosts your body’s level of cortisol, the stress hormone. People with type A blood tend to have more cortisol, anyway. So you may have a harder time dealing with stressful situations.

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Malaria

Type O blood may help ward off this disease. You can get malaria when an infected mosquito bites you. The parasite that causes it has a harder time attaching itself to type O blood cells.

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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. 

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Blood Clots

Venous thromboembolism (VTE) is when your blood clots in a deep vein, like the ones in your legs. These clots sometimes move to your lungs. Research shows that people with type A, B, or AB blood are at a higher risk of VTE.

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Life Span

Chances are higher you’ll live longer if you have type O blood. Experts think your lowered risk of disease in your heart and blood vessels (cardiovascular disease) may be one reason for this.

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Fertility

Your blood type can’t predict whether you’ll get pregnant, but it may play a role. In one study, women with low numbers of healthy eggs were more likely to have type O blood than any other type. More research is needed to figure out why.

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Diabetes

Type 2 diabetes seems to happen more often in people with blood types A and B. Experts aren't sure why. More research is needed. 

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Stroke

Your risk for a stroke goes up if you have blood type AB. Doctors think that’s because it’s more likely to clot than other types.