Hair disorders that involve hair loss are androgenic alopecia, which is the most common and afflicts about half of all men and women as they age. Anagen effluvium: is hair loss due to drugs or treatments, such as chemotherapy. Physical or psychological stress can cause telogen effluvium. Alopecia areata only occurs on the scalp or beard area with hair falling out in patches. If you wear your hair too tight, you might get traction alopecia. Excessive hair growth includes two general disorders. The first is male pattern hair growth known as hirsutism, which is caused by an over abundance of male hormones. The other is hypertrichosis, which causes hair to grow anywhere on the body and can be congenital or acquired.