Helicobacter pylori, or H. pylori, is a type of bacteria that can enter the body and live in your digestive tract. H. pylori infections are very common and don’t cause symptoms for most people. But after years of infection, people can develop ulcers in the stomach lining or small intestine. The bacteria attacks the lining that usually protects from stomach acid. When enough damage is done, acid gets into the lining and causes ulcers to form.

People with ulcers may experience a burning pain in their abdomen, especially when the stomach is empty. Other symptoms can include bloating, burping, vomiting or not feeling hungry. If a doctor determines that the ulcers are caused by H. pylori, antibiotics will be prescribed.