Original Article: http://www.mayoclinic.com/health/medical/IM01785
Normally, supporting ligaments and other connective tissues hold your uterus in place inside your pelvic cavity. Weakening of these supportive structures allows the uterus to slip down into the vagina. As a result, the vagina also is pulled down and may turn inside out. Doctors refer to this downward movement of the uterus as uterine prolapse.