Amebiasis Chronic arsenic poisoning Coeliac disease Colorectal cancer Anal melanoma[3] Cystocele Cytomegalovirus (in immunocompromised patients) Diverticular disease Dysentery Hemorrhoid, which are prolapsed Imperforate hymen[4] Inflammatory bowel disease Irritable bowel syndrome Ischemic colitis Kidney stones, when a stone is lodged in the lower ureter [5] Pelvic organ prolapse Radiation proctitis Rectal gonorrhea Rectal lymphogranuloma venereum Rectal parasitic infection, particularly Trichuris trichiura (whipworm) Rectocele Shigellosis Ulcerative colitis