Postoperative chemotherapy for rectal cancer should not be subjected to cold, because it may cause gastrointestinal function disorder and even diarrhea after being subjected to cold. Rectal cancer is a common malignant tumor in clinic, after chemotherapy, it will cause gastrointestinal tract function disorders, patients will have more frequent stools, uncontrollable stools and other phenomena. If the patient gets cold again, it will further disturb the function of gastrointestinal tract, so the patient must pay attention to keep warm and avoid getting cold. Patients also need to develop good dietary habits, as well as bowel habits, which can improve the quality of life of patients. Patients who have been exposed to cold must be treated with medication under the guidance of a doctor to improve their symptoms.