Colon cancer usually develops in about 0.5-1 year, and many colon cancers are formed on the basis of secondary colon polyps or colonic villous adenomas. Patients may not have any symptoms at the beginning, and when symptoms such as increased frequency of stools or unformed stools, or anemia, black stools, or possibly intestinal obstruction occur, it is usually possible to make a clear diagnosis. It may take about 0.5-1 year from the beginning of tumor formation to the appearance of symptoms, and it may take longer if the patient’s symptoms are aggravated. Therefore, it is necessary to go to the hospital for examination in time for more frequent stools, loose stools and blood in stools, and if colon cancer can be detected early and treated early, the effect of surgery is very good.