Gastroenteroscopy should eat easy-to-digest food 3 days before the examination, and should eat fluids 1 day before, and need to fast after dinner 1 day before the procedure to the day of the procedure, and take gastroscopy lubricating gelatin paste 4~6 hours before the examination. If there is no discomfort 2~4 hours after the gastroenteroscopy, you can eat a semi-liquid diet. 3 days before the gastroenteroscopy examination, patients are recommended to eat easy-to-digest semi-liquid food, such as white porridge, millet porridge, noodles, etc. 1 day before the examination, it is recommended to consume liquid food, such as rice soup and rice paste. Fasting is required after dinner 1 day before the operation and on the day of the operation. If you eat before the gastroenteroscopy, it will affect the doctor’s observation of the stomach and intestines, and you will not be able to make an accurate judgment. Within 4 to 6 hours before gastroenteroscopy, gastroscopy lubricating gelatin paste should be taken orally as prescribed by the doctor in order to avoid inaccurate results and to allow a clear field of view so that mucosal lesions can be clearly observed. After the gastroenteroscopy, patients should first temporarily fasting, fasting 2 to 4 hours, and then can try to drink a small amount of lukewarm water, if there is no discomfort, then you can eat semi-liquid food, such as congee, noodles, etc., and the next day can generally return to a normal diet. Patients who have severe abdominal pain, vomiting blood, blood in stool, etc. after gastroenteroscopy should go to the hospital immediately and let the doctor give treatment.