Rectal cancer is a malignant tumor between the dentate line and the junction of the rectosigmoid colon. Its symptoms include blood in the stool, increased frequency of stool, urgency, and anal swelling. Rectal cancer is a malignant tumor with high prevalence and death rate, and is a tumor of the gastrointestinal tract. At present, the incidence rate in China continues to be high, so why do so many people commit rectal cancer? The reasons are as follows: 1. Bad eating habits, irregular diet, high-fat diet, high-calorie diet and barbecue and other foods are closely related to the incidence of rectal cancer. At the same time, long-term consumption of red meat will also increase the incidence of rectal cancer, including pork, beef and so on. 2.Sedentary and lack of exercise. 3, genetic factors, colorectal cancer has a certain genetic tendency. Like most malignant tumors, genetic factors play an important role in the development of colorectal cancer. However, it is not a dominant genetic disease. If parents have the disease, their children must have the disease, but the risk of cancer is higher than the general population. 4.Pathology of own intestinal tract. Disorders of intestinal flora, colorectal adenoma (not the same as polyp, but adenoma is a tumor polyp), chronic proctitis (ulcerative colitis, etc.). 5.History of pelvic radiotherapy. 6, long-term mental depression also has a certain possibility of causing the disease. 7, obesity, especially over 50 years old. 8.Long-term smoking. In order to reduce the incidence of rectal cancer, it is necessary to eat more fresh vegetables containing vitamins and high fiber, and less high-fat and high-protein diet. Cereals should be coarse and fine. Eat less fried food, maintain body weight and shape, quit smoking and drinking, and have regular medical checkups. Enhance exercise and regulate your mood.