Rectal bleeding is not necessarily colorectal cancer; there are several reasons for rectal bleeding: First, caused by constipation, which leads to difficulty during bowel movements and tearing of the anal mucosa, resulting in bleeding. Second, ulcerative colitis, which commonly presents symptoms such as abdominal pain, diarrhea, and blood and mucus in the stool. Third, rectal or colon cancer, where the main symptoms also include abdominal pain, changes in stool characteristics, and rectal bleeding. Fourth, ischemic bowel disease, generally seen in older patients with some cardiovascular and ischemic diseases, where symptoms mainly include significant abdominal pain and rectal bleeding. Therefore, not all cases of rectal bleeding are due to rectal cancer; there are many causes, and it is essential to diagnose clearly before treatment.