Most of the symptoms of colon cancer are advanced, and the most common symptoms are: (1) Bloody stool is a common advanced symptom of colon cancer, which is also the first and most common symptom of colon cancer. Due to the different location of cancer, the amount and nature of bleeding varies, and long-term bleeding can produce secondary anemia. (2) Bowel obstruction symptoms The late symptoms of colon cancer mainly include abdominal pain, constipation, abdominal distension, vomiting, hyperactive bowel movement, and sometimes patients with colon cancer can see bowel pattern. (3) Systemic symptoms Patients with colon cancer may have different degrees of anemia, malnutrition, systemic failure, weight loss and cachexia, etc. These are common symptoms of colon cancer. These are common late stage symptoms of colon cancer. (4) Other symptoms Infection of colon cancer can cause chill and fever; perforation can cause diffuse or limited peritonitis; invasion of urinary system can cause urinary system symptoms. Late symptoms of colon cancer may include hepatomegaly, jaundice, ascites, enlargement of left supraclavicular lymph nodes and other symptoms specific to metastasis from other organs.