With the improvement of living standard, people gradually fall into the strange circle of high-fat and high-protein diet structure, which makes colorectal cancer, the third ranking cancer family, gradually replace lung cancer as the “family leader” trend. To pay attention to rectal cancer and prevent it intentionally, we only need to take three steps to avoid the trouble of rectal cancer. The first step is to adjust the diet structure and have a reasonable and healthy diet. The phrase “pass intestinal stool, detoxify intestines” is familiar to many people. To do this, we should eat more food with high fiber, i.e. more fresh vegetables and fruits; appropriate intake of fat and protein, i.e. meat and eggs; less or no pickled products. You can drink some yogurt appropriately to intake intestinal beneficial bacteria and regulate the dysbiosis, thus reducing or avoiding the occurrence of intestinal inflammation, and thus reducing the incidence of inflammation-related rectal cancer. The effect will be better if it can be combined with proper exercise. Step 2: Seek timely medical treatment for minor discomfort. If you find that your stool habit changes, often accompanied by diarrhea or constipation, poor bowel movement, blood or mucus in the stool, bloating, abdominal pain, lower abdominal cramps or discomfort, unexplained anemia or weight loss and other uncomfortable symptoms, you should seek medical advice in time and should not use drugs indiscriminately. Because these are the early signs of rectal cancer, we should pay enough attention to them, and do away with the fluke mentality of getting by. Step 3: Regular physical examination, early detection, early diagnosis and early treatment. This step is the most important and effective one. A lot of data show that early detection, early diagnosis and early treatment can greatly reduce the harm of rectal cancer and improve the long-term survival rate. This tells us that we should have the awareness of planning ahead and preventing the disease before it happens. We need to change our mindset and have regular medical checkups, through which we can effectively detect, diagnose and treat rectal cancer at an early stage. The cost of medical checkups is minimal compared with the cost of treatment after the disease, but its effect is huge. Not only can the huge trauma of radical surgery be avoided, but also the survival time and quality of life can be greatly improved, even suspiciously no different from normal people. At present, anorectal endoscopy is the most effective way to detect rectal cancer, and its pathological confirmation can be taken for suspicious lesions, and at the same time, precancerous lesions such as rectal polyps or some early rectal cancers can be burned away microscopically, thus can avoid the huge physical and mental trauma of major surgery. Anal endoscopy is recommended every two years, especially for people over the age of 50, or those with a family history of rectal cancer or rectal polyps.