The endocrine abnormalities associated with the development of androgen-dependent hirsutism have been presented and discussed in the light of the frequent finding of ultrasonographic abnormalities suggestive of polycystic ovary syndrome. A simple protocol of investigation, which should ideally include pelvic ultrasonography, has been presented. The treatment of hirsutism by combined anti-androgen and oestrogen therapy has been detailed and other approaches discussed.