Normal stools usually do not have mucus, when mucus stools appear, it may be due to ulcerative colitis, acute bacillary dysentery, rectal cancer and so on. 1. Ulcerative colitis: It may be due to the damage of the ulcerated mucous membrane in the colon, and the long-term stimulation of inflammation, etc., so that the mucous membrane or tissues in the intestines will be detached and discharged with the stool to form mucous stool, which may be accompanied by pus and blood. 2. Acute bacillary dysentery: it is a kind of intestinal disease caused by Shigella, due to the toxicity of bacteria, it causes necrosis of intestinal villi or intestinal mucous membrane, which will be discharged with the stool and form mucous stool. 3. Rectal cancer: If there is tumor in rectum, when the tumor bleeds or inflammation occurs, the inflammation stimulates the intestinal tract to secrete more mucus, accompanied by bleeding spots, and when the stool is discharged, mucus stool with blood may appear. When mucus stool occurs, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.