When colon cancer patients visit the doctor, many of them are already in advanced stage. The symptoms of advanced colon cancer patients are as follows: 1. When most patients visit the doctor, there are changes in defecation habits and changes in the nature of stool, such as bloody stool, pus and blood stool, as well as with shortness of breath. The posterior urgency is the pus and blood stool irritation of the anus, the patient has been trying to go to the toilet, but the volume of defecation is small. Some patients will have thin stools; 2. Some patients will have alternating diarrhea and constipation; 3. Patients will have abdominal pain. Because the tumor occurs in many parts, patients will have different degrees of pain in different parts of the abdomen. Because colon cancer patients are diagnosed late, some abdominal masses will be felt in the abdomen during physical examination; 4. Patients will have some systemic symptoms, such as anemia, fever, and cachexia, that is, patients are very thin and ascites may appear.