Enlarged uterus causes can vary. You may experience an enlarged uterus as a result of a range of health conditions, including uterine fibroids, pregnancy, adenomyosis, and certain types of cancers involving the reproductive organs.
Large or multiple fibroids are a common cause of an expanding uterus.If the fibroid(s) grow larger within the uterine cavity, they may expand the uterus just like a pregnancy does. If the fibroid(s) grow larger outside into the uterine wall, they may press on surrounding organs.