MSD Manual

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Introduction to Gastritis and Peptic Ulcer Disease

By

Nimish Vakil

, MD, University of Wisconsin School of Medicine and Public Health

Medically Reviewed Jun 2021 | Modified Sep 2022
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Topic Resources
The Stomach
VIDEO

In Zollinger-Ellison syndrome Gastrinoma A gastrinoma is a tumor usually in the pancreas or duodenum (the first segment of the small intestine) that produces excessive levels of the hormone gastrin, which stimulates the stomach to... read more , a rare tumor that usually occurs in the duodenum, pancreas, or adjacent structures, produces a hormone called gastrin that causes the stomach to produce too much acid.

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