Bowel cancer in situ is not very serious, because the tumor is only confined to the inner mucosa or submucosa, and there is no lymphatic blood metastasis, it can be treated by surgery under doctor’s guidance. Bowel cancer in situ refers to the in situ cancer growing in the rectum, usually it does not deeply invade the submucosa and belongs to the early stage of cancer, which may cause symptoms such as abdominal distension, diarrhea, pain, etc. Generally, it can be resected under the colonoscopy, and regular observation can be made after the resection, and it does not need to carry out large-scale surgery, nor adjuvant treatments such as chemotherapy and radiotherapy. Adopt good dietary habits, eat a light diet, eat more fresh fruits and vegetables, exercise regularly to improve their resistance, supplement their vitamins, and maintain a healthy and good weight. This disease is highly specialized, should be timely to the regular hospital, under the guidance of the doctor to determine the specific treatment plan, and actively cooperate with the treatment to avoid deterioration of the condition.