It is not recommended to take gastric mucous membrane protector before gastroscopy, which will affect the examination. Gastroscopy is a clinical examination that combines a lens and a monitor to visually present the condition of the digestive tract in front of the physician. It is necessary to fast and abstain from food and water before performing gastroscopy, and in order to facilitate the examination, it is necessary to take anesthesia medication and antifoaming agents under the guidance of the doctor. Gastroscopy is not recommended to take other drugs in addition to the drugs needed for the examination, because the drugs need a certain amount of time to digest after entering the stomach, the examination will affect the effect of gastroscopy due to the residue of drugs in the gastrointestinal tract. It is recommended that patients fully communicate with the examining physician before gastroscopy to avoid delaying the examination, and patients with serious cardiorespiratory dysfunction and other conditions need to carefully consider gastroscopy.