Preparations before gastroscopy include understanding the operation process, abstaining from drinking and fasting, adjusting the mindset, and adjusting medication. 1. Understanding the operation process: For those who have the need for gastroscopy, they should fully understand the process and risks of gastroscopy before the examination, which will help them to complete the gastroscopy successfully. Some people who are sensitive to pain and irritation may also choose painless gastroscopy after evaluation by the doctor. 2. No food or drink: Gastroscopy requires the instrument to be put into the digestive tract through the mouth, so some people will experience nausea and vomiting and other uncomfortable symptoms. In order to avoid choking, asphyxiation and the influence of food in the digestive tract on the examination results, patients should fast for at least 6 hours before the examination, and the fasting time should be prolonged in special cases, such as those with pyloric obstruction or gastroparesis, and those with pancreatic dystrophy. 3. Adjustment of mind: those who have the need for gastroscopy should adjust their mind so that the health care workers can carry out the gastroscopy operation smoothly. 4. Adjustment of medication: if people take anticoagulant and blood-activating drugs for a long time before the examination, they need to consult with the doctor whether they need to stop using the relevant drugs, in order to prevent affecting the operation of gastroscopy, such as gastroscopic mucosal biopsy. In addition to the above preparations, before the examination, you should also loosen the neckline and belt, remove the denture. It is recommended to consult a regular hospital for gastroscopy to ensure the accuracy of the test results.