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An ulcer is the end result of an imbalance between digestive fluids in the stomach and duodenum. Most ulcers are caused by an infection with a type of bacteria called Helicobacter pylori (H. pylori).

Peptic ulcers are sores that develop in the lining of the stomach, lower esophagus, or small intestine. The most common symptom of a peptic ulcer is burning abdominal pain that extends from the navel to the chest.