According to the data, the incidence rate of colorectal cancer in China ranks third after lung cancer and stomach cancer, and the incidence rate in urban areas is growing at a rate of 4.5% per year, which has a tendency to surpass the original number one tumor, stomach cancer, and must be paid great attention to. Therefore, in the prevention of colorectal cancer, try to make yourself “bitter”, “toxic” and “diligent”. Be bitter in diet. If you eat a lot of high-oil and high-fat food and do not exercise, your intestines will be “lazy” and peristaltic movement will slow down, and toxic substances will accumulate in your intestines for a longer time, which will lead to various diseases over time. Therefore, cooking a light vegetarian diet, which not only can prevent colon cancer, but also prevent many chronic diseases. The eyes are a little more toxic. Because most tumors do not release toxins and are not easily detected at an early stage, the word “poison” here actually reminds us to be good at detecting traces of cancer with our eyes, especially “good at detecting abnormalities in stool”, such as blood in stool. For example, 80% of colorectal cancer patients have blood in stool; change in stool habit, sudden increase or decrease of regular stool, diarrhea, unclean stool, etc.; change in stool shape, flattening, thinning or irregular stool, etc. are all warning signs. Be more “diligent” in examination. The “diligent” here does not mean that we do not have to do tests, but in some tests can not be lazy. For example, patients feel uncomfortable or embarrassed to undergo finger examinations during physical examinations, and doctors sometimes find it troublesome, and this examination must be conducted in a private place, so many people choose to give up. “In the screening of colorectal cancer, there are two tests that must be done, one is stool occult blood test, if the result is positive, be careful; one is blood tumor marker test, we commonly use CEA and CA19-9. 1/3 of people can detect cancer early through these two tests”. Therefore, middle-aged people, especially those over 40 years old, had better go for these two tests every year. Finally, Dr. Yu suggested that no matter what the disease is, people must go to a regular hospital to avoid delaying treatment. Especially colorectal cancer, after standardized and correct treatment, its survival is much better than both lung cancer and stomach cancer, and patients must remember this point.