Most of the patients are able to tolerate ordinary gastroscopy, however, the tolerance level of each person is different and needs to be considered in the context of individual circumstances. Gastroscopy can be divided into ordinary gastroscopy and painless gastroscopy, of which ordinary gastroscopy is a kind of examination without anesthesia and under the state of patient’s consciousness. During the examination, nausea, vomiting and other discomforts may occur when the gastroscope passes through the throat, and abdominal distension may occur during the process of injecting gas into the throat, but these symptoms are usually relatively mild, so most of the patients are able to withstand it. However, the degree of tolerance varies from person to person and depends on individual circumstances. For example, nausea and vomiting symptoms are more severe in people with more sensitive throats. Patients who need to undergo a gastroscopy should cooperate with the doctor and inform the doctor if they experience severe discomfort during a general gastroscopy.