Alcohol is generally not recommended in the evening of a same-day gastroscopy. Gastroscopy looks at the esophagus, stomach or duodenum for polyps, ulcers, tumors and other lesions, as well as pathology, which may cause damage to the mucosa of the digestive tract. The chemical component of alcohol is ethanol, which stays in the stomach for a period of time and comes into direct contact with the mucous membranes of the stomach and duodenum, irritating the mucous membranes of the digestive tract and causing gastrointestinal discomfort. In case of patients who use gastroscopy for pathological biopsy, the gastric mucosa will be damaged to a certain extent, and alcohol consumption should be prohibited on that night, which may lead to gastric hemorrhage and other problems if alcohol is consumed. Therefore, it is recommended that patients should not drink alcohol for 3 days after gastroscopy, and at the same time consume easily digestible food. Avoid stimulating, spicy, cold and other foods, such as strong tea and coffee, so as not to irritate the mucosa of the digestive tract.