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Merck Manual

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Introduction to Gastritis and Peptic Ulcer Disease


Nimish Vakil

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

Last full review/revision Mar 2020| Content last modified Mar 2020
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Gastritis and peptic ulcer disease involve damage to the lining of the stomach or duodenum (the first segment of the small intestine). These disorders are usually caused by

In Zollinger-Ellison syndrome, 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.

Usually the lining of the stomach is protected by certain defense mechanisms. The cells that line the stomach secrete mucus and bicarbonate. The mucus coats the inside of the stomach to protect it from being damaged by acid and digestive enzymes. The bicarbonate within and under the mucus helps neutralize stomach acid. When these defense mechanisms are disrupted, for example, by the bacterium Helicobacter pylori or aspirin, people may develop gastritis or peptic ulcer disease. There are many treatment options available (see Drug Treatment of Stomach Acid).

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