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18. Androgenetic Alopecia: Cause of 95% of all hair loss :: Posted Thursday, May 24, 2001 by admin ::
Androgenetic alopecia or pattern baldness is the most common cause of hair loss is pattern loss, which eventually affects over 70% of men and 15% of women. In classic pattern, hair thins in a horseshoe pattern, although more diffuse loss can also occur. Painting - Self Portrait by Cezanne.
At least two sequential processes contribute to pattern loss, which begins as an abnormal sensitivity of the hair follicles to androgens of male sex hormones. In most people, this is followed by a local immune reaction to the affected hair follicle, which further damages it and is probably responsible for its eventual death. Both men and women experience androgenetic alopecia, or pattern hair loss, although men generally experience a much greater degree of loss. In men, the pattern of loss starts with the hairline or back of the head, advances to thin the top of the head, and often leaves just a fringe of hair extending from ear to ear across the back of the head and affects the thinner, shorter, and less pigmented hairs of the frontal and parietal portions of the scalp.
In women, pattern loss tends to be more diffuse, and occurs over a broader area. Women usually do not have bald spots, but rather have overall thinning hair. In diffuse hair loss in men or women, over 50% of the hair can be lost before the results are readily apparent.
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