Colorectal cancer, including colon cancer and rectal cancer, is one of the most rapidly increasing malignant tumors in China, and the incidence of colorectal cancer is increasing in economically developed cities, which is closely related to the improvement of our living standards and changes in lifestyle. So far, the factors related to the development of colorectal cancer include dietary factors, intestinal disease factors, genetic factors and exercise factors. 1. Dietary factors: High-fat, high-protein, high-energy and low-fiber diet are the high incidence factors of colorectal cancer, mainly because the above-mentioned diet has high carcinogenic substances and low residue, resulting in less intestinal movement and less bowel movement, which further concentrates the effect on intestinal mucosa and causes cancer. Research shows that: carotene. Vitamin B2, vitamin C, vitamin E can reduce the relative risk of colorectal cancer, vitamin D, calcium, onion and garlic foods have a protective effect. Pan-fried, smoked, baked and fried meat and pickled foods contain carcinogens that act on the intestinal mucosa. Some trace elements and minerals are also related to the development of colorectal cancer. 2, intestinal disease factors: chronic enteritis, especially ulcerative colitis, is closely related to colorectal cancer. Colorectal adenoma is the first disease related to colorectal cancer. The relationship between intestinal schistosomiasis and colorectal cancer has been proved by Chinese scholars, and about 10-15% of late stage schistosomiasis patients in China are complicated by colorectal cancer. 3.Hereditary factors: About 20-30% of colorectal cancer patients have family history of tumor, if one immediate family member has colorectal cancer, the chance of their immediate family members having colorectal cancer is more than 3 times of normal population; the chance of family members having hereditary colorectal cancer is more than 50%, such as familial adenomatosis and hereditary non-adenomatous colorectal cancer, which is worthy of great attention of family members. 4.Exercise factors: Research shows that exercise is related to the development of colorectal cancer, while some studies suggest that colorectal cancer is closely related to obesity. Special emphasis: “It is important to change dietary habits, usually eat less high-protein, high-fat, high-energy meat foods, less pickled, fumigated meat foods, more vegetables and fruits rich in fiber and vitamins; pay attention to exercise and strengthen exercise.”