Diet can be resumed about 2 hours after common gastroscopy; patients are recommended to eat semi-liquid food such as white porridge within 24 hours after colonoscopy, and try to avoid spicy and stimulating food such as chili peppers and peppercorns after 24 hours. Gastroenteroscopy, if endoscopic treatment, such as hemostasis, etc., requires fasting and water retention, intravenous nutrition, acid suppression and other treatments, the specific duration depends on the change of the condition. Gastroscopy, including ordinary gastroscopy and painless gastroscopy, can not only observe the oropharynx, esophagus, stomach, duodenum mucosal lesions, but also carry out gastroscopic biopsy of pathological tissues and gastric polyp resection, hemostasis of upper gastrointestinal tract and other treatments; enteroscopy can be used to directly observe intestinal lesions, to determine the presence of ulcers, erosion, inflammation, occupation, etc., and can also take intestinal tissues for pathological biopsy. Gastroenteroscopy patients should follow the doctor’s instructions, under the guidance of the doctor to carry out the examination.