Singh G.Indian J Dermatol Venereol Leprol 2002;68:40

Androgenic alopecia ( hair loss ) genetically-determined., The exact mode of inheritance is unknown. The shortening of the anagen phase of the hair cycle leads to the consequent increase in the proportion of telogen hairs. Autosomal dominant inheritance with increased penetrance in males had been suggested, but there are reports of multifactorial inheritance as well. The role of androgen along with their interaction with genetic factors is demonstrated in men, but in women baldness is often associated with elevated levels of circulating androgens, the factor determining Pattern hair loss is how the follicles of the scalp react to the circulating androgens.