Hypochondriasis is a persistent fear of having a serious medical illness. A person with this disorder tends to interpret normal sensations, bodily functions and mild symptoms as a sign of an illness with a grim outcome. For example, a person may fear that the normal sounds of digestion, sweating or a mark on the skin may be a sign of a serious disease. A person with hypochondriasis may be especially concerned about a particular organ system, such as the cardiac or digestive systems. A doctor's reassurance and even a complete medical evaluation often will not calm the person's fears. Or, if it does calm them, other worries may emerge days later.
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