Androgenetic Alopecia is the most common cause of hair loss in men. This is due to a combination of hormones (androgens) and a genetic predisposition. It is characterized by a receding hairline and hair loss on the top and front of the head. A similar form of hair loss occurs in women and this is known as female pattern hair loss. This results in thinning hair in the mid-frontal area of the scalp and is generally less severe compared to men.