Stomach polyps form in response to damage to your stomach lining. The most common causes of stomach polyps are:

  • Chronic stomach inflammation. Also known as gastritis, this condition can cause the formation of hyperplastic polyps and adenomas. Hyperplastic polyps are unlikely to become cancerous, although those larger than about 2/5 inch (1 centimeter) carry a greater risk. Adenomas are the least common type of stomach polyp but the type most likely to become cancerous. For that reason, they are generally removed.
  • Familial adenomatous polyposis. This rare, inherited syndrome causes certain cells on the stomach's inner lining to a specific type of polyps called fundic gland polyps. When associated with this syndrome, fundic gland polyps are removed because they can become cancerous. Familial adenomatous polyposis can also cause adenomas.
  • Regular use of certain stomach medications. Fundic gland polyps are common among people who regularly take proton pump inhibitors to reduce stomach acid. These polyps are generally small and aren't a cause for concern. Fundic gland polyps with a diameter larger than about 2/5 inch (1 centimeter) carry a small risk of cancer, so your doctor might recommend discontinuing proton pump inhibitors or removing the polyp or both.
Oct. 17, 2015