This condition is caused by weakness of the pelvic floor. The pelvic floor consists of the muscles, nerves, and connective tissue that surround the uterus, vagina, bladder, and rectum, providing support and helping these organs function properly. When these support structures become weakened, the pelvic organs can begin to fall out of their normal position. The movement of these organs, or prolapse, may make it more difficult for these organs to function normally.
Other names for pelvic organ prolapse include cystocele or "fallen bladder" (bladder prolapse), rectocele (rectal prolapse), and "dropped uterus" (uterine prolapse).