The precautions after gastrointestinal examination include fasting, prohibiting spicy and stimulating diet, and avoiding dangerous activities. 1. Fasting: After gastrointestinal examination, patients should suspend eating for two hours. If there is no abnormal performance within 2 hours, you can gradually eat some warm and cool liquid food such as vegetable soup, rice soup and so on. If endoscopic treatment is carried out, it is more important to strictly follow the doctor’s instructions to delay eating time. 2. Prohibit spicy and stimulating diet: patients can gradually resume normal diet after 24 hours without discomfort. However, they should not eat spicy and stimulating food, such as chili peppers and garlic, so as not to aggravate the irritation of gastric mucosa. 3. Avoid dangerous activities: because in the gastrointestinal examination, the doctor may use anesthetics to inhibit the patient’s gastrointestinal response, so within 6 hours after the examination should be accompanied by a family member, to avoid dangerous activities such as working at heights, and also to avoid driving and so on. If lesions such as ulcers or perforations are found after gastroenteroscopy, or if blood in the stool, blood in the vomit, or abdominal pain persists after the examination and cannot be relieved, it is necessary to consult a doctor in the hospital in a timely manner.