Unshaped stool with bleeding may be caused by ulcerative colitis, bacillary dysentery, colorectal cancer and other disease factors. 1. Ulcerative colitis: it is a chronic non-specific inflammatory disease of the colon and rectum, with recurrent mucous bloody stools, diarrhea, abdominal pain and other symptoms. 2. Bacterial dysentery: it is an infectious disease of the intestinal tract caused by Shigella, which may present with symptoms such as pus and blood stool or mucus stool, diarrhea, abdominal pain, fever, urgency and heaviness (discomfort in the lower abdomen, wanting to defecate very much, and feeling of incomplete defecation after defecation) and so on. 3. Colorectal cancer: it is a kind of malignant tumor originated from mucous epithelium of colorectum, which may have the symptom of bleeding in stool, accompanied by the change of stool shape and the increase of frequency of defecation. It is recommended to go to the hospital to consult the doctor to determine the cause of the bleeding when it occurs in the case of unshapely stool.