Gastroscopy test is mainly observed in the stomach wall, the next morning to do gastroscopy one night recommended that patients prohibit drinking water. Gastroscopy is mainly through the oral cavity probe into the gastroscope, observation of the esophagus, gastric wall mucosa surface, if the patient’s stomach has a lot of food, water, is not conducive to the gastroscope into the gastric cavity, and the water blocks the gastroscope on the gastroesophageal mucosa observation, so the patient is not recommended to drink water on the first night. Moreover, if the patient drinks water, gastroscopy will cause nausea, vomiting and other discomforts due to anesthesia or gastroscope stimulation, which will increase the risk of aspiration. Generally, if gastroscopy is done the next morning, no water should be consumed and no food should be eaten or drink should be prohibited after 8:00 p.m. on the first night, so as to avoid food and water from affecting the results of the gastroscopy test.