Most common cause of hair loss in males is hereditary androgenetic alopecia (male pattern baldness). The presence of the hormone, dihydrotestosterone (DHT), in a genetically susceptible man is necessary for this problem to occur. In females, diffuse hair loss with thinning is more common which may be due to genetic factors, thyroid disease, iron deficiency, stress or less commonly due to high fever, surgery or general anesthesia, “crash diets,” childbirth. In androgenetic alopecia hairs on the front and top of the scalp start to shrink until it eventually disappear. The hairs on the back and side of scalp are genetically “permanent” hair, not affected by DHT. These permanent hairs are utilized in hair transplantation.
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