Colon cancer is a malignant tumor that occurs in the epithelium or glands of the colonic mucosa, and is a common malignant tumor in the gastrointestinal tract. It is generally caused by the following factors. 1.Environmental factors, generally among various environmental factors, dietary factors are the most important. The incidence of colorectal cancer has a lot to do with high fat consumption in food. In addition, it may also be related to the lack of trace elements and change of living habits. 2.Genetic factors, genetic factors are one of the causes of colon cancer. If a first-degree relative has had colorectal cancer, their next generation will suffer from this disease more than the general population in their lifetime. About 1/4 of the new patients have family history of colorectal cancer. 3, inflammatory bowel disease, patients with ulcerative colitis are much higher than the general population to get colon cancer, mostly seen in patients with extensive lesions at an early age and a long course, cancer often occurs in the flat mucosa. The development of inflammatory proliferative lesions can often be accompanied by the formation of polyps, which can further develop into intestinal cancer, and those with colon and rectal related diseases can also cause cancer. The factors introduced above are the causes of colon cancer, of course, the formation of the disease is not a day or two, patients must have a correct attitude of prevention and treatment, and actively cooperate with doctors’ diagnosis and treatment.