Blood groups are often associated with emergencies such as blood transfusions. However, medical experts say they can also reveal important health insights. Recent studies indicate that blood groups may influence the risk of certain diseases, including stomach cancer.
Scientific research has examined how cancer risks differ among people with various blood groups. With stomach cancer cases rising worldwide, researchers focused on how blood type may affect susceptibility to the disease.
A study published in the medical journal BMC Cancer in 2019 found that individuals with blood groups A and AB are at higher risk of developing stomach cancer than those with blood group O. People with blood group A were found to have a 13–19 percent higher risk, while those with blood group AB may face an 18 percent increased risk. Multiple meta-analyses have supported these findings.
Experts also note that people with blood group A are more prone to Helicobacter pylori infection, a bacterium strongly linked to stomach cancer. Even without this infection, blood group A individuals may still have a higher risk. For blood group AB, the presence of the bacterium can further increase susceptibility.
Medical specialists emphasize that blood groups alone do not directly cause cancer. Factors such as immune response, inflammation, cell interaction, and stomach acid levels may all play a role in disease development.
Stomach cancer is influenced by multiple factors, including poor diet, smoking, alcohol use, obesity, infections, and environmental factors. The disease is more common in Asia, Eastern Europe, and Latin America, and men are more often affected than women. Risk also rises with age.
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Health experts recommend adopting a healthy lifestyle, maintaining a balanced diet, avoiding tobacco, and attending regular medical check-ups. These measures can help reduce the risk of stomach cancer and improve overall health.
