Common etiology of rectocolonic stenosis: Due to scar contracture after rectal surgery or excessive mucosal damage during surgery, such as internal hemorrhoidectomy, rectal anastomosis. Caused by rectovaginal fistula surgery, etc. Necrosis of the mucosa and intestinal wall due to corrosion by drugs, resulting in strictures, such as internal hemorrhoids, prolapse injections, misuse of corrosive drugs for enemas, etc. Scarring of the rectum due to radiation therapy or cauterization, resulting in stricture. Stenosis occurs when the rectum is damaged and then infected, resulting in scarring. Congenital dysplasia and inflammation and tissue proliferation of the rectum due to various reasons, causing rectal stricture. For example, proctitis, rectal and colonic schistosome granuloma, amebic granuloma, venereal lymphogranuloma, etc. Rectal stenosis is caused by pressure from rectal tumors and adjacent tissue masses outside the intestine, such as prostate tumors, ovarian cysts, uterine tumors, etc. According to the ancestral medicine, this disease is caused by heat stagnation in the large intestine, poor qi flow, or is related to trauma and mistreatment.