Ulcers: 15 signs and symptoms you shouldn't ignore ©Shutterstock Also known as gastric or peptic ulcers, stomach ulcers happen when part of the stomach or intestinal lining becomes eroded.

When the ulcer is in the stomach it might also be called a gastric ulcer. Ulcers in the first part of the small intestine (duodenum) may be called a duodenal ulcer. The most common cause of a ...