At present, the incidence of colorectal cancer occupies the 2nd place among malignant tumors worldwide, and the more economically developed countries and regions are, the higher its incidence is. Epidemiological observations and experimental studies show that diet is decisive in the occurrence of colorectal cancer, and the increase in fat consumption is proportional to the increase in the incidence of colorectal cancer, and people who consume high amounts of fat have a high rate of death from colorectal cancer. Another factor in the diet related to the occurrence of colorectal cancer is fiber. Black Africans have a higher fiber content in their diet and thus have a lower death rate from colorectal cancer than whites, while whites have very little fiber intake and have a relatively higher incidence of colorectal cancer. Most of the patients are usually caused by their dietary habits, and their usual diet can be said to be “meatless and meatless”, and they love to eat fried and barbecued food, so they have a big belly at a young age. High-fat diet, especially the diet containing saturated fatty acids, can promote the production of cholesterol metabolites and secondary bile acids, carcinogenic effect. And insufficient dietary fiber will increase the chance of carcinogens and colonic mucosa contact. Perhaps, this also explains in a way that the more economically developed countries and regions are, the higher the incidence of colorectal cancer. At present, in China, the incidence rate of colorectal cancer has increased significantly due to the increasingly westernized lifestyle, especially higher in the middle and lower reaches of Yangtze River. Treatment: High rate of radical treatment for early detection “Colorectal cancer occurs in a multi-stage process from polyp – adenoma – adenocarcinoma. Polyps and adenomas are a class of benign gastrointestinal lesions, and patients with intestinal polyps should be removed in a timely manner, usually through minimally invasive treatment under endoscopy.” Once colorectal polyps become neoplastic, they usually manifest as changes in bowel habits and traits, such as decreased or increased frequency of bowel movements, thinning of stools, blood in stools (dark red or bright red blood mixed with stools or wrapped around the surface of stools), mucus in stools, incomplete bowel movements or abdominal pain associated with bowel movements, etc. Some patients may also experience unexplained wasting or anemia. When the above symptoms are found, colonoscopy should be conducted in time to clarify the foci and causes of gastrointestinal bleeding, do not think that it is hemorrhoids and take it lightly, resulting in delayed treatment. Early stage colorectal cancer is not a terminal disease and can be cured if diagnosed and treated as early as possible. At present, the treatment of colorectal cancer is mainly surgical resection, supplemented by chemotherapy and radiotherapy. After radical resection, the 5-year survival rate of early stage patients can be over 90%. Therefore, in order to prevent colorectal cancer, improve the radical cure rate and prolong the survival, the key lies in etiological prevention and early diagnosis. Prevention: Develop good living habits To prevent intestinal cancer, we should pay more attention to our body, such as actively preventing and treating rectal polyps, anal fistula, ulcerative colitis and chronic enteritis; for multiple polyps and papillary polyps, once the diagnosis is clear, they should be surgically removed as early as possible to reduce the chance of carcinogenesis. Forming good living habits is also the key to prevent intestinal cancer. One should quit smoking and limit alcohol; develop good eating habits, not to eat partial food, not to eat a lot of high-fat food, and eat more fresh vegetables and fruits, especially yellow and green vegetables rich in vitamin A and vitamin C. The diet should not be too fine, and eating some coarse grains appropriately can promote defecation and reduce the stay of carcinogenic substances in the intestinal tract. Don’t eat too much salty and spicy food, and don’t eat too hot, too cold or spoiled food. Those who are old and weak or have certain disease genes should eat some anti-cancer foods and alkaline foods with high alkaline content as appropriate. At the same time, maintaining a good mental state, weight control and regular physical activities are also conducive to the prevention of colorectal cancer.