Androgenetic alopecia is characterized by progressive, patterned hair loss from the
scalp, and occurs in both men and women as well as in certain primates. The transition
of some terminal hairs into vellus hairs is a near universal physiological secondary
sexual characteristic,
1
therefore androgenetic alopecia only becomes a medical problem when the hair loss
is subjectively viewed as excessive, premature, and distressing.
2
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