TIM VERNON / SCIENCE PHOTO LIBRARY TIM VERNON / SCIENCE PHOTO LIBRARY
Gastric ulcer. Illustration of an ulcer (red) in the lining of a human stomach. Gastric ulcers are erosions of the mucosal lining of the stomach. They are sometimes caused by the presence of Helicobacter pylori bacteria, or by the use of non-steroidal anti-inflammatory drugs.
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