Doctors identify the blood type most at risk for developing stomach cancer

Some studies have found that people with blood type A may have a slightly higher risk of developing stomach cancer compared with some other blood groups. The National Cancer Institute lists type A blood among the recognized risk factors for stomach cancer, and several large reviews have also reported a higher gastric cancer risk in blood group A.

That said, blood type is only one small part of the picture. Having type A blood does not mean someone will get stomach cancer, and many people with stomach cancer do not have type A blood. Researchers generally view blood type as a risk marker, not a direct cause by itself.

The stronger and more important stomach cancer risk factors are things like Helicobacter pylori infection, smoking, certain diet patterns such as high intake of salted or smoked foods, and some stomach conditions or inherited syndromes. These factors matter much more in everyday prevention than blood type alone.

Researchers are still studying why blood group A may be linked to higher risk. One proposed explanation is that ABO blood group differences may influence inflammation, immune response, or how the stomach reacts to H. pylori infection. But even where an association exists, the increased risk is usually described as modest, not extreme.

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