Rectal cancer is a very common malignant tumor of the digestive system, and early stage may show symptoms of thinning of stool or blood in stool. However, how thin it is depends on the shape of the mass and the thickness of the patient’s rectum. Generally, it is not too thin, because there is no obvious bowel obstruction in the early stage of rectal cancer. In this case, the diagnosis can be confirmed through anal finger examination, usually through 2 fingers, and then further colonoscopy for pathological examination. After the diagnosis of rectal cancer, early rectal cancer can be treated by surgery, and the effect is very good. Depending on the distance of the tumor from the anus, anal preservation surgery or fistula surgery can be performed. After surgery, it can be combined with the comprehensive treatment of adjuvant radiotherapy and chemotherapy to control the development of the disease and prolong the survival period. Early stage rectal cancer can also be treated without radiotherapy for a while, with regular review and further radiotherapy in case of disease progression.