DefinitionRectal prolapse is when the tissue that lines the rectum falls down into or sticks through the anal opening.Causes, incidence, and risk factorsRectal prolapse occurs most often in children under age 6 and in the elderly. It is often associated with the following conditions:ConstipationCystic fibrosisMalnutrition and malabsorption (celiac disease is an example)Pinworms (enterobiasis)Prior injury to the anus or pelvic areaWhipworm infection (trichuriasis)SymptomsThe main symptom is a reddish-colored mass that sticks out from the opening of the anus, especially following a bowel movement. The lining of the rectal tissue may be visible and may bleed slightly.Signs and testsThe health care provider will perform a physical exam, which may include a rectal exam. Tests will be done to de