Precautions before and after colonoscopy mainly include diet, medication as prescribed by the doctor, and avoiding strenuous exercise. Enteroscopy is an invasive examination, which can visually check the condition of intestinal mucosa and help in the diagnosis of diseases. Before colonoscopy, you should pay attention to the diet with less fiber and less slag, and try to avoid eating dragon fruit, melon seeds, fungus and other foods, so as not to affect the intestinal tract cleaning. Drugs need to pay attention to the recent 1 to 2 weeks to avoid taking anticoagulant drugs, such as aspirin, clopidogrel, etc., so as not to affect the coagulation function, resulting in bleeding during the examination. Strictly follow the doctor’s instructions to take the drugs to clean up the intestinal tract on time and according to the dosage, so as to avoid insufficient preparation of the intestinal tract, which may affect the visual field under the colonoscopy. After the colonoscopy need to pay attention to fasting or liquid diet, strictly follow the doctor’s instructions to use the drugs to stop bleeding and protect the intestinal mucosa, so as to avoid bleeding. Also need to pay attention to avoid strenuous exercise in a short period of time, if it is difficult to relieve abdominal distension, abdominal pain and other symptoms, need to consult a doctor in a timely manner.