Gastroscopy generally refers to electronic gastroscopy. 3 days after gastroscopy, the diet is not clinically defined, and the postoperative diet depends on whether the examination is performed by gastroscopy or by gastroscopy for related invasive operations, such as obtaining pathological tissue biopsies and removing polyps. There are differences in postoperative diet for different forms of examinations. First of all, if painless gastroscopy is performed, without special circumstances, the clinic now generally requires that food can be eaten 2 hours after the examination, no alcohol within 12 hours, and no excessively hot, cold and spicy stimulating food within 24 hours to avoid damage to the mucosa of the gastrointestinal tract. Within three days, a light and easily digestible diet is the mainstay, and there are usually no other special issues that need attention. If there is a special diet, the doctor doing the examination will explain the precautions to the patient after the gastroscopy. Secondly, if the operation is performed through painless gastroscopy, such as polypectomy, if the gastrointestinal polyp is small and the operation is less traumatic, the doctor will usually require a 6-hour fast, after which a liquid diet or semi-liquid diet with less residue can be consumed; if the polyp is large, a 24-hour fast may be required for close monitoring, and if there is no gastrointestinal bleeding, a liquid or semi-liquid diet with less residue can be resumed, avoiding cold Avoid cold and hot food. Avoid hard, cold, hot and spicy stimulating food for 2 weeks after surgery, eat less and more meals, chew slowly, avoid overeating, avoid smoking and alcohol, reduce the intake of coffee or strong tea, and focus on light and easy to digest diet to avoid stimulating the wound.