The vast majority of men who go bald do so because of a hereditary condition known as androgenetic alopecia, more commonly known as male pattern baldness. According to the American Hair Loss Association, 95 percent of hair loss in men is caused by androgenetic alopecia. This inherited trait that tends to give guys a receding hairline and a thinning crown is caused by genetic sensitivity to a byproduct of testosterone called dihydrotestosterone (DHT).