stomach ulcer is a virus or bacteria
Helicobacter pylori (H. pylori) is a type of bacteria. These germs can enter your body and live in your digestive tract.After many years, they can cause sores, called ulcers, in the lining of your stomach or the upper part of your small intestine. For some people, an infection can lead to stomach cancer.Infection with H. pylori is common. About two-thirds of the worldâs population has it in their bodies. For most people, it doesnât cause ulcers or any other symptoms.elicobacter pylori (H. pylori) is a type of bacteria. These germs can enter your body and live in your digestive tract.