Colon cancer is a common malignant tumor of the gastrointestinal tract occurring at the junction of the rectum and sigmoid colon, with the highest incidence in the age group of 40 to 50 years old, and the ratio of men to women is 2 to 3:1. The incidence rate is the third highest among gastrointestinal tumors. Colon cancer is mainly adenocarcinoma, mucinous adenocarcinoma and undifferentiated cancer. The general morphology is polyp-like, ulcerated and so on. Colon cancer can develop along the circumference of intestinal wall, spread up and down along the longitudinal path of intestinal tube or infiltrate deeply into the intestinal wall. In addition to metastasis and local invasion via lymphatic vessels and blood stream, it can also spread and metastasize into the abdominal cavity or along the suture and incision surface. Patients with chronic colitis, colon polyps and male obese people are the susceptible groups. What kind of people are susceptible to colon cancer? According to the research findings: 1. People with high fat and low residue diet have high incidence of colon cancer. The incidence rate of colon cancer is high in North America and Western Europe, but low in Asia, Africa and Latin America, which indicates that the incidence of colon cancer is related to dietary habits. The structure of Chinese gastrointestinal tract is suitable for vegetarian diet, but nowadays many people eat low-fiber and high-fat food, so the colon mucosa will be stimulated by adverse factors for a long time and mutation will occur. In addition, less fiber in food makes it easy to be constipated, which makes carcinogenic substances come into contact with intestinal mucosa for a long time and increases the carcinogenic effect. The peak incidence of colon cancer is between 40 and 60 years old, with about 45 years old being the high incidence age. I have an acquaintance who is only 29 years old this year and was found to have rectal cancer, he usually likes to eat meat and drink, not eating vegetables and staple food, his intestinal cancer may be related to his eating habits. 2.The incidence of cancer in people with colonic adenoma and familial polyposis is higher than that of the general population. 3.The incidence of bowel cancer in people with chronic inflammation of the colon, such as ulcerative colitis, is also higher than that of the general population. 4.The incidence rate of those with family history of colon cancer is four times higher than that of the general population, indicating that genetic factors may be involved in the development of colon cancer.