H. pylori and cancer
H. pylori infection causes some cancers and other illnesses.
H. pylori infection is a major cause of stomach (gastric) cancer. H. pylori causes long-lasting gastritis, which is thought to be the first step in developing stomach cancer.
But it’s important to know that fewer than 3% of people with H. pylori infection develop stomach cancer.
H. pylori infection is related to a higher risk of MALT lymphoma of the stomach. This is a type of non-Hodgkin lymphoma. Nearly all MALT lymphomas of the stomach are related to H. pylori infection. People infected with H. pylori have a low risk of developing MALT lymphoma (less than 1%).