Cancer may occur at a young age, mostly due to heavy work pressure, irregular living habits, irregular diet, poor dietary hygiene and hereditary factors. Nowadays, the incidence age of various malignant diseases such as rectal cancer, colon cancer and stomach cancer is getting younger and younger, and such diseases may be caused by irregular diet, poor dietary hygiene or irregular work and rest. Irregular work and rest can lead to endocrine imbalance in the human body, the phenomenon of decreased resistance, which can easily lead to the occurrence of malignant tumors. Dietary hygiene, dietary uncleanliness is often closely related to the occurrence of gastric polyps, gastritis and other diseases, psychological pressure, work pressure is also one aspect, genetic factors are also a very important reason, if there is a family heredity of the population will have a higher chance of developing cancer than those who do not have a family heredity of the population will have a higher chance of developing cancer.