The bowel movement may be caused by irritable bowel syndrome, proctitis, rectal polyps and other diseases. 1. Irritable bowel syndrome: a kind of functional bowel disease characterized by abdominal pain or abdominal discomfort with changes in bowel habits without organic lesions. The main manifestations of abdominal pain or abdominal discomfort, diarrhea, abdominal distension, bowel movement, which can cause the bowel movement is not clean and always have a bowel movement. 2. Proctitis: refers to the inflammation that occurs in the inner wall of the rectum. The main manifestations are frequent or persistent bowel movements, blood in the stool, abdominal pain, constipation, diarrhea and other symptoms, which can also cause frequent bowel movements. 3. Rectal polyp: refers to the mucosal surface of the rectum to the intestinal cavity protruding bulging lesions. Most patients with rectal polyps do not have obvious symptoms, some patients may show changes in bowel habits, painless blood in the stool, polyp prolapse and other symptoms, but also can cause the bowel is not clean always have a bowel movement. There are many other causes for the lack of bowel movement, which should be taken seriously, and the cause of the problem should be identified in a timely manner, and further processed or treated according to the doctor’s instructions.