Pus stool may suffer from intestinal infectious diseases, perianal diseases, intestinal malignant tumors and so on. 1. Intestinal infectious diseases: such as amoebic dysentery, ulcerative colitis, Crohn’s disease, etc., due to intestinal infections caused by intestinal mucosal injury, necrotic cell detachment and intestinal mucus mixed with the formation of pus, accompanied by abdominal pain, diarrhea and other symptoms. 2. Perianal diseases: because of prolonged constipation, repeated diarrhea and other induced perianal abscess, anal fistula, etc., purulent secretion attached to the surface of feces, resulting in pus. 3. Malignant tumor of intestinal tract: for example, colon cancer, rectal cancer, due to the infiltration of cancer cells into local tissues, resulting in pus, increased frequency of defecation, body wasting and other symptoms. Pus pulling is also seen in colon polyps, rectal polyps, etc. It is recommended to consult doctor in time to find out the cause of the disease and treat it as soon as possible.