Ostomy surgery mainly refers to intestinal fistula, if there is mucus discharged from the anus, it may be due to insufficient preoperative intestinal preparation, mucus secretion from the rectal mucosa, the stool is more dilute and flow into the anus and other reasons. 1. Inadequate preoperative intestinal preparation: Because of the need to empty the intestines before fistula surgery, so as not to fall into the abdominal cavity during the operation and cause infection. If the bowel is not adequately prepared there can be residual stool, when the fistula surgery is completed, because the cerebral cortex to control the anal sphincter for a long time, the formation of a conditioned reflex, the cerebral cortex still has a reaction to defecation, so the residual mucus will flow out of the anus. 2. Rectal mucosa secretion of mucus: because of intestinal fistula will retain a section of the rectum, retain the physiological function of the section of the rectum will still exist, the rectal mucosa will also secrete mucus, when the early stage of the operation, the cerebral cortex will still be able to control the defecation reflex, the mucus secreted by the mucous membrane of the rectum will be discharged from the anus. 3. Thinner stools: If the patient has a tab type stoma, the physiological function of the distal bowel still exists, if the stool liquid is thinly discharged from the proximal end, it may also flow into the distal intestinal tabs, and then be discharged out of the body through the anus by peristalsis of the intestinal tract. Patients with mucus discharge from the anus after stoma surgery are advised to go to the hospital in time to get a clear picture of the cause of the disease and then give targeted treatment and therapy.