A condition in which the testes or ovaries don't work properly.

With hypogonadism, the body doesn't make enough testosterone or estrogen. The cause may start in the testes or ovaries. Or it can start in the parts of the brain that signal the sex organs to make hormones.

Hypogonadism symptoms can affect growth and development, as well as delay puberty. Fertility can be affected. The exact symptoms depend on the cause of hypogonadism and at what point in life the condition starts.

Hypogonadism treatment usually involves taking medicine to boost the body's levels of sex hormones. Fertility treatments called assisted reproductive technology can help couples become pregnant.