Hypogonadism occurs when your sex glands produce little or no sex hormones. The sex glands, also called gonads, are primarily the testes in men and the ovaries in women. Sex hormones help control secondary sex characteristics, such as breast development in women, testicular development in men, and pubic hair growth. Sex hormones also play a role in the menstrual cycle and sperm production.
Hypogonadism may also be known as gonad deficiency. It may be called low serum testosterone or andropause when it happens in males. Most cases of this condition respond well to appropriate medical treatment.