Helicobacter pylori (H. pylori) infection occurs when H. pylori bacteria infect your stomach. This usually happens during childhood.
A common cause of stomach ulcers (peptic ulcers), H. pylori infection may be present in more than half the people in the world.
Most people don’t realize they have H. pylori infection because they never get sick from it. If you develop signs and symptoms of a peptic ulcer, your health care provider will probably test you for H. pylori infection.
A peptic ulcer is a sore on the lining of the stomach (gastric ulcer) or the first part of the small intestine (duodenal ulcer).
Most people with H. pylori infection will never have any signs or symptoms. It’s not clear why many people don’t have symptoms. But some people may be born with more resistance to the harmful effects of H. pylori.
When signs or symptoms do occur with H. pylori infection, they are typically related to gastritis or a peptic ulcer and may include:
Helicobacter pylori (H. pylori) infection