Peptic ulcers may be less common, but their risks—and treatments—are evolving rapidly. Learn about symptoms, causes like H. pylori and NSAIDs, & new therapies.

Here are some soft-tissue sarcomas of the abdomen: Gastrointestinal stromal tumor (GIST) usually forms in the stomach or small intestine. Leiomyosarcoma ... the abdomen and an area within it called ...