Gastroscopy can be performed in 1~2 days after the vaccination as long as there are no uncomfortable symptoms that will not affect the gastroscopy. The new crown virus is highly contagious and the population is generally susceptible. Especially children, the elderly and some patients with chronic diseases, the infection will be more serious. After vaccination, the body will produce protective antibodies, which can greatly reduce the chance of being infected. The vaccine is relatively safe, and the vast majority of the population will not experience any discomfort after vaccination, and will not be affected by various examinations, including gastroscopy. Of course, a small number of vaccinated people may experience low-grade fever, nausea and vomiting. In this case, gastroscopy is not recommended and it is advisable to wait until the body recovers. If you feel unwell after receiving the vaccine, you should consult a doctor and cooperate with him/her as soon as possible.