The occurrence of rectal cancer is a process involving multiple factors and multiple steps, and it is the result of the interaction between environmental factors and genetic factors of the body. To date, its causes are not completely understood, but there are some factors that are considered high-risk. First, dietary factors are generally believed to be high in animal protein, high fat, and low fiber, which are significant factors in the high incidence of rectal cancer. Second, lifestyle factors such as prolonged sitting, smoking, drinking, being overweight, and obesity may increase the incidence of rectal cancer. Third, having a history of medical surgeries. Fourth, environmental factors, such as asbestos workers. Fifth, genetic factors.