Rectal cancer was originally a disease of Europeans and Americans, but as urbanization in China becomes more and more developed and lifestyle changes gradually westernize, rectal cancer in China has also become popular and gradually has a trend of youthfulness. So how should we detect and prevent rectal cancer? There are more and more cases of rectal cancer at young age, and it is worrying that young people often suffer from rectal cancer with high malignancy and metastasis easily in early stage, and more than half of the patients have low tumor location, which increases the difficulty of preserving the anus during surgery. Clinically, patients with advanced colorectal cancer at the age of 14 have been identified. In recent years, rectal cancer and other gastrointestinal tract tumors have been trending younger in urban China. Regular rectal examinations are necessary to prevent rectal cancer in people over 40 years of age. The incidence of rectal cancer and other gastrointestinal tumors is higher in the urban white-collar population between 30 and 50 years of age. As this group usually sits a lot and does not move much, their diet and life are not regular, and the high pressure of work is the main reason for the increase of disease incidence. For this reason, he recommends that people over 40 years of age should undergo regular fecal occult blood testing once a year, and those who are positive should undergo further examination. In addition, people who have a history of colorectal cancer in their first-degree relatives, a history of cancer or intestinal polyps in themselves or two or more factors such as chronic diarrhea, chronic constipation, mucus and blood stools, chronic appendicitis, severe mental trauma, cholecystitis, etc., are all at high risk for colorectal cancer. At present, chemotherapy for rectal cancer and other gastrointestinal tumors has made great progress. Standardized, full-dose and full-course chemotherapy can reduce the risk of death of stage 3 colon cancer patients by 20% and the risk of recurrence by 22%; the chance of 5-year survival of advanced colorectal patients reaches 9.8%. Rectal cancer is a lifestyle disease that comes out of eating Rectal cancer is a disease closely related to lifestyle. The accelerated pace of modern society and the long-term pressure of life, family, work, school and employment, coupled with irregular work and rest, lack of sleep, lack of exercise, and decline in body immune function, will increase the risk of rectal cancer. Especially after the gradual improvement of living standard, Chinese people are influenced by western food culture and prefer high-fat, high-protein and low-fiber food, which leads to the high incidence of rectal cancer. The youthfulness of rectal cancer needs to remind the young people to start booking cancer from their lifestyle, not to eat casually and get rectal cancer and regret it too late.