The incidence of rectal cancer continues to rise, prevention first of all to “keep your mouth shut” the most easily misdiagnosed “cancer disease”. A. Bowel cancer is important to prevent in advance According to doctors, colorectal cancer, often called colorectal cancer, including colon cancer and rectal cancer, is a common malignant tumor, the incidence of which continues to rise. According to the Annual Report of China Tumor Registry published in 2012, the domestic incidence rate of colorectal cancer is about 29.44/100,000 and the mortality rate is 14.23/100,000, and the incidence rate of colorectal cancer in some developed cities is close to or even higher than the level of developed countries. With the urbanization process, westernization of diet structure and aging of social population in China, the incidence rate and mortality rate of colorectal cancer in China will further increase. The occurrence of colorectal cancer is a multifactorial and multi-stage process, which is the result of the interaction between the internal factors of human body and the external factors of the environment. Epidemiological studies show that environmental factors account for about 80% of the attributable risk of colorectal cancer, mainly related to high-fat, high-calorie, low-fiber diet and lack of physical activity. Another 20% of colorectal cancers are related to genetic background. Currently, the treatment of colorectal cancer is mainly surgical resection, supplemented by chemotherapy and radiotherapy. The 5-year survival rate after radical resection of colorectal cancer is about 50%, and the 5-year survival rate after radical resection for early stage patients can be as high as 90% or more. “Therefore, the key to preventing colorectal cancer, increasing the radical cure rate and prolonging survival lies in etiological prevention and early diagnosis.” Second, to prevent and treat colorectal cancer, the first thing is to “keep your mouth shut” Doctors say that in the daily diet, more high-protein, high-vitamin and low-fat easily digestible foods should be consumed and fatty foods should be reduced because fatty diet will enhance the concentration of bile acids in the intestine, and high concentrations of bile acids have cancer-promoting effects. Fish, poultry, lean meat and low-fat dairy products should be used instead of meat with too much animal oil, and boiled and steamed food instead of fried food. You should eat more fresh vegetables and fruits, especially yellow and green vegetables rich in vitamin A and vitamin C. Diet should not be overly fine, and eating some coarse grains appropriately can promote bowel movement and reduce the stay of carcinogenic substances in the intestine. Doctors especially remind to eat less pickled and smoked foods such as salami, ham, salted meat, salted fish, etc., or high-temperature grilled and fried foods. Pickled foods contain carcinogenic nitrosamines, and high-protein foods produce heterocyclic amines after high temperature or deep-frying, all of which have obvious carcinogenic and mutagenic effects. The right amount of vitamin D and calcium can be combined with fatty acids in the intestine to form insoluble compounds and excreted from the body. It is worth mentioning that eating 6 slices of garlic per week can reduce the chance of colorectal cancer. From an international perspective, Japan is a very good example of controlling the incidence of colorectal cancer. According to the survey, the amount of fat in the current Japanese diet only accounts for 12% of the total calories, and the incidence of colorectal cancer is significantly lower than that of other countries and regions. Third, constipation often occurs to pay attention to the prevention and treatment of colorectal cancer, need to develop a good lifestyle. The first thing is to quit smoking. Tobacco burning process will produce a lot of toxic and harmful substances, which can induce the occurrence of colorectal cancer, lung cancer and other malignant tumors. For the office population, to prevent and treat colorectal cancer, it is necessary to prevent and treat constipation first. The prolonged stay of feces in the intestinal cavity will make the toxins (chemical carcinogens such as amines, phenols, ammonia, azo benzene, indole, methylindole, hydrogen sulfide and other toxic products) in the stool prolong the contact time with the intestinal mucosa, and the intestinal wall will become cancerous under the lasting stimulation of toxins. Doctors especially pointed out that many people think that oral consumption of aloe vera, rhubarb, or drinking diet tea can reduce the symptoms of constipation, in fact, the opposite effect, these products will be due to the accumulation of anthraquinones contained in the intestinal wall, leading to intestinal melanosis, and intestinal melanosis is one of the culprits of colorectal cancer. The key to improve constipation is to drink more water, exercise more, maintain a good diet structure, eat more fiber-based foods, and consume honey and yogurt appropriately. At the same time, weight control and regular physical activity can help defecate and help prevent colorectal cancer.