Male pattern baldnessMale pattern baldness is thought to occur in varying forms in about 66% of adult males at some point in their lives. It is characterized by hair receding from the lateral sides of the forehead, known as "receding hairline" or "receding brow." An additional bald patch may develop on top (vertex). The trigger for this type of baldness, which is also known as androgenic alopecia, is currently believed to be 5-alpha reductase, an enzyme that converts the hormone testosterone into dihydrotestosterone (DHT), which, in genetically-prone hairs on the scalp, inhibits hair growth. Onset of hair loss sometimes begins as early as end of puberty, and is mostly genetically determined. Male pattern baldness is classified on the Hamilton-Norwood scale I-VIII.
Table of Contents:
Female pattern baldness
Mechanism of male pattern baldness
Evolutionary theories of male pattern baldness