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What causes hair loss?The most common type of hair loss is androgenetic alopecia, also called male-pattern hair loss and female-pattern hair loss. In this case, people inherit the tendency to go bald from either or both parents. In both women and men, genes trigger a sensitivity to a class of hormones called androgens, including testosterone, which causes hair follicles to shrink. Shrinking follicles, the sheath that surrounds the root of a hair, produce thinner hair and eventually none at all. In men with androgenetic alopecia, hair loss occurs in a typical pattern on the forehead area and on top of the head. In women with androgenetic alopecia, hair loss occurs throughout the scalp with overall thinning of hair. Other, less common types of hair loss can cause clumps of hair to fall out or hair thinning and may be caused by an illness. Alopecia areata is an autoimmune disease in which inflammatory cells attack hair follicles, resulting in distinct, round patches on any area of the scalp or body. Trichotillomania is an impulse control disorder (as are compulsive gambling and compulsive stealing), in which there is an inability to resist urges to pull out one's scalp hair, eyelashes, eyebrows, or other hair. Traction alopecia involves hair loss around the edge of the hairline and is especially noticeable around the face and forehead. It is caused by hairstyles that pull hair too tight; for example, tight braids or tight ponytails can cause hair loss. Telogen effluvium involves widespread hair thinning over the scalp or other areas of the body. It is caused by changes in the growth cycle of hair.
Posted on May 30, 2004 at 04:59 PM
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