It is impossible to determine the benign chance of rectal mass, and biopsy is needed to make a clear diagnosis. For rectal mass with a diameter of more than 2cm, we should be alert to the possibility of malignant changes and suggest early surgical treatment. Rectal mass is a protruding tissue in rectum, if it is stimulated by feces and inflammation for a long period of time, abdominal pain, blood in stool, change of stool pattern and other symptoms may appear, most of them are benign, but there are malignant possibilities as well. If it is benign, such as hemangioma, rectal polyp, etc., if the diameter is not big, no obvious discomfort can be observed for regular review, if the diameter is more than 2cm, surgery can be considered; if this tissue is taken out for biopsy during colonoscopy, and is found to be a malignant tumor, it is generally necessary to evaluate and then operate and carry out chemotherapy and other treatments as soon as possible, and it is necessary to have regular review to prevent its recurrence. To prevent intestinal tumors, it is usually necessary to develop good defecation habits, avoid spicy stimulating and greasy food, and if there is a family history of gastrointestinal tumors, it is recommended to do gastroenteroscopy on a regular basis for early detection, early diagnosis and early treatment.