Androgenetic alopecia is the most common cause of hair loss in men. At least three factors are predominant: time, heredity, and hair physiology. About 30% of men will experience this type of baldness around the age of 30, and 50% to 65% will experience it between the ages of 50 and 60. Over time, the patient will observe:
This development is taken up by the Norwood and Hamilton classification in men and that of Ludwig in women, which allow the stage of a patient's baldness to be assessed. This alopecia inexorably induces a more aged appearance of the face, which is more or less well experienced and considered by the patient.
This hair loss is linked to the disruption of a physiological mechanism between the hair follicle and a hormone: dihydrotestosterone (DHT).
This hormone is obtained by the action of an enzyme, 5-alpha-reductase, acting on another hormone: free testosterone.
The disruption of this balance leads to an overly rapid turnover of the hair cycle, miniaturization of the hair and progressive thinning of the hair.
The capital of hair cycles is depleted and the scalp becomes bald.
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