Hypogonadism is an endocrine disorder in which the testes in men, and the ovaries in women, produce low quantities of testosterone and oestrogen respectively. The origins of this disorder can vary and may include hereditary factors, some types of surgery, autoimmune diseases, kidney or liver problems and infections. The most common symptoms of hypogonadism in women are the loss of menstruation and pubic hair, hot flushes, low libido. In men, the symptoms include loss of hair on beard and body, loss of muscle tone, breast enlargement and erection problems. The low production of testosterone in men is known as male hypogonadism.