Colon cancer is a malignant tumor and there is no benign colon cancer. Symptoms of colon cancer mainly focus on abdominal discomfort, change of stool trait and change of stool habit. Abdominal discomfort: there may not be obvious symptoms in early stage, and abnormal manifestations such as abdominal pain, abdominal distension and so on may appear after the disease progresses. Change of stool characteristics: colon cancer may lead to relative narrowing of the lumen of colon, which may make the stool thinner and softer. If the cancer cells infiltrate blood vessels, there may be blood in stool, or black stool, pus blood stool or mucus stool. Change of bowel habit: colon cancer may lead to more frequent bowel movements, and some colon cancer patients have to go to the toilet more than ten times a day. It may be caused by the stimulation of gastrointestinal tract by cancer cells. In addition to these typical symptoms, colon cancer in advanced stage may also have symptoms such as loss of appetite, emaciation, etc. Cancer metastasized to the chest may cause chest pain, and metastasized to the head may cause headache, etc. If the above symptoms exist, it is recommended to go to the doctor promptly. If the above symptoms exist, it is recommended to go to the hospital in time to receive relevant examination and treatment.