The process of gastroscopy usually has preparations such as fasting, anesthesia, examination process and post examination treatment. 1. Preparation: Usually, patients need to fast before the gastroscopy, generally should be prohibited from eating and drinking 8 hours before the examination. 2. Anesthesia: If anesthesia is needed for painless gastroscopy, intravenous anesthetics are commonly used, such as propofol. Ordinary gastroscopy can be local anesthesia, before the examination, the patient needs to take local anesthetic drugs, put in the mouth for 1-2 minutes and then slowly swallowed, so that the throat, esophagus and stomach numbness. 3. Examination process: usually after successful anesthesia, the patient can take the left side lying position, after wearing a dental pad, the doctor will insert the gastroscope from the mouth into the throat, general gastroscopy patients can follow the doctor’s instructions to swallow slowly, so as to facilitate the gastroscope to enter the esophagus, and then into the stomach, a thorough examination of the esophagus and stomach. 4. Post-examination treatment: do not eat within 1-2 hours after the examination, and liquid food can be consumed after 1-2 hours to avoid damaging the gastric mucosa. If you need to carry out the examination, you need to go to a regular hospital to be guided by a doctor, gastroscopy needs to be operated by a professional doctor.