This situation may not necessarily be rectal cancer; it could also be due to colitis or colorectal polyps, which then cause abdominal bloating and blood in the stool. For patients suspected of having rectal cancer, an initial electronic colonoscopy should be conducted. Abnormal masses can be detected in the rectal area, and a pathological biopsy is required to confirm whether it is rectal cancer. Furthermore, the main clinical symptoms of rectal cancer include an increased frequency of bowel movements, a strong urge to defecate, and more frequent bowel movements. There is also mucus and pus in the stool mixed with blood. For such cases, diagnosis requires an electronic colonoscopy and a pathological biopsy. Additionally, abdominal bloating and blood in the stool could also be due to inherent gastrointestinal dysfunction and internal hemorrhoids, which typically present bleeding as bright red blood.