Hair Loss in Men
Androgenic alopecia is the most common form of hair loss, affecting both men and women, with an increase of prevalence with age in both sexes. (In women 6-12% by age 20-30; 40-55% above age 70). The primary reason for hair loss in men is genetics. 95% of all instances of noticeable hair loss are caused by androgenetic (also known as male pattern baldness).
Androgens hormone (dihydrotestosterone and testosterone) have been shown to play a major role in male pattern hair loss.
The hair growth cycle is affected, the hair shafts in male pattern baldness become progressively miniaturized and involved areas in men can completely lose all follicles over time Studies showed that 30% over age 30 and 50% over age 50 experience signs of hair loss.
Characteristic signs are: hair receding from the lateral sides of the forehead (receding hairline) and/or a thinning crown (balding to the area known as the “vertex”).
Both become more pronounced until they eventually meet, leaving a horseshoe-shaped ring of hair around the back of the head. The progression of male pattern baldness is generally classified on the Hamilton–Norwood scale, which ranges from stages I to VII.