The saying that there are three signs of bowel cancer when going to the toilet is unreliable. Bowel cancer patients may have symptoms such as blood in the stool, constipation, urgency and heaviness (discomfort in the lower abdomen, wanting to relieve the stool, and a feeling of incomplete defecation after going to the toilet) when going to the toilet. However, the degree of illness and physical condition of each patient are different, so the symptoms during the period of illness are not absolute and cannot be finalized. In the early stage of the disease, bowel cancer patients usually have no obvious symptoms. As the disease progresses, symptoms such as blood in stool, constipation, urgency, feeling of incomplete bowel movement, abdominal pain and bloating, and no anal discharge may appear. Changes in stool characteristics, such as thinning of the fecal column, may also occur. Some patients may also suffer from systemic symptoms, such as emaciation, weakness, depression, shortness of breath and loss of appetite. If the cancer cells invade into the surrounding tissues or organs, it may also cause corresponding clinical symptoms, such as jaundice when the cancer cells metastasize to the liver. If the above symptoms occur, it may be caused by intestinal cancer. It is recommended to go to the hospital and follow the doctor’s instruction to have relevant examinations to clarify the cause of the disease and receive treatment as soon as possible.