Rectal prolapse occurs when the rectum passes through the anal opening.
Several factors influence its development, including pelvic floor defects, weakened anal sphincter muscles, an abnormally large colon, prolapse of the small intestine, constipation, diarrhoea and chronic cough.
The main symptom is pain during bowel movements, when the inner lining of the rectum protrudes through the anal opening. There may be slight bleeding.
Diagnosis is made by clinical history and physical examination, including a digital rectal examination. Additional tests may include blood tests and a colonoscopy.
Incomplete prolapse can be treated with a high-fibre diet. In complete cases, the alternative is surgery, which can be performed abdominally or perineally.
- Rizwan Ahmed, Susan L. Gearhart. Diverticulosis y trastornos anorrectales frecuentes. Harrison. Principios de Medicina Interna. Volumen 2. 19ª Edición. 1971:1978.

