Some studies have explored whether certain blood groups may be linked to a slightly higher risk of specific cancers. Researchers have especially looked at the ABO blood groups: A, B, AB, and O.
Blood groups most often linked in studies
Blood group A has been associated in some research with a higher risk of stomach cancer.
Blood group AB has been linked in a few studies to certain cancers such as pancreatic cancer.
Blood group B has shown mixed results, with some studies suggesting small increases for certain cancer types.
Meanwhile, blood group O is often found to have a slightly lower risk for some cancers in comparison.
Important Things to Know
Having one of these blood groups does not mean you will get cancer.
The increased risk found in studies is usually small.
Lifestyle factors such as smoking, alcohol use, obesity, poor diet, lack of exercise, infections, and family history have a much bigger impact on cancer risk.
Warning Signs That Shouldn’t Be Ignored
See a doctor if you notice:
Unexplained weight loss
Persistent fatigue
Unusual bleeding
A lump that doesn’t go away
Lasting pain
Changes in bowel habits
A persistent cough
Ways to Lower Cancer Risk
Avoid tobacco
Eat more fruits and vegetables
Exercise regularly
Maintain a healthy weight
Limit alcohol
Get recommended screenings
Protect your skin from excessive sun exposure
Medical researchers continue studying the relationship between blood type and disease risk, but blood group alone is not considered a reliable predictor of cancer.