Why some men lose their hair?
Male pattern baldness is related to the genes and male sex hormones. It usually follows a pattern of receding hairline and hair thinning on the crown, and is caused by hormones and genetic predisposition.
Each strand of hair you have sits in a tiny hole (cavity) in the skin called a follicle. Baldness in general occurs when the hair follicle shrinks over time, resulting in shorter and finer hair. Eventually, the follicle does not grow new hair. The follicles remain alive, which suggests that it is still possible to grow new hair.
Androgenetic or androgenic alopecia is often attributed to genetic predisposition and family history. Androgenic alopecia is seen in both men and women. The hair loss in men is often faster, earlier onset, and more extensive.
Doctors refer to common baldness as androgenetic alopecia or androgenic alopecia, which implies that a combination of hormones and heredity (genetics) is needed to develop the condition. The exact cause of this pattern is unknown. (The male hormones involved are present in both men and women.)
Even men who never go bald thin out somewhat over the years. Unlike those with reversible telogen shedding, those with common male-pattern hair loss dont notice much hair coming out; they just see that its not there anymore.
Adolescent boys notice some receding near the temples as their hairlines change from the straight-across boys pattern to the more M-shaped pattern of adult men. This normal development does not mean they are losing hair....