sometimes called estrogen replacement therapy. The use of estrogen from other sources after a woman’s ovaries stop making it. This type of hormone therapy is sometimes used for short periods to relieve symptoms of menopause. Estrogen alone can raise the risk of endometrial cancer (cancer of the lining of the womb), so a women who still has a uterus (womb) is usually also given progesterone to lower this risk. It might also increase breast cancer risk slightly in some women. See also estrogen, menopausal hormone therapy, menopause, progesterone.