DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Intestinal ulcer. Endoscope view of an ulcer (white, centre right) on the lining of duodenum, the first part of the small intestine. Also known as a peptic ulcer, it forms when digestive juices attack the intestinal walls. This is usually due to reduced production of the protective mucus which lines the walls. This can be caused by foods and chemicals which irritate the lining, such as alcohol, caffeine and aspirin, or by bacteria. Treatment is with antacid drugs, which reduce the acidity of the stomach's juices, or ulcer-healing drugs such as cimetidine.
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