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Abdominal pain. Computer artwork of the torso of a man suffering from discomfort, with his hand held across his abdomen. The yellow glow in his abdominal area depicts pain. Among the many causes of abdominal pain are appendicitis, food poisoning, gallstones, kidney stones, and intestinal obstruction. The most common cause, however, is indigestion or change of diet. (KEYSTONE/SCIENCE PHOTO LIBRARY/DAVID GIFFORD)