NCIt definition : A mucosal erosion that occurs in the esophagus, stomach or duodenum. Symptoms can
include abdominal pain, nausea and vomiting, and bleeding.;
Alternative definition : NICHD: A mucosal injury that occurs in the stomach or duodenum.; NCI-GLOSS: A break in the lining of the lower part of the esophagus, the stomach,
or the upper part of the small intestine. Peptic ulcers form when cells on the surface
of the lining become inflamed and die. They are usually caused by Helicobacter pylori
bacteria and by certain medicines, such as aspirin and other nonsteroidal anti-inflammatory
drugs (NSAIDs). Peptic ulcers may be linked to cancer and other diseases.;