Gastroscopy is now very common, mainly through a thin soft tube through the mouth into the throat, esophagus and then into the stomach and duodenum, so as to observe whether the esophagus, stomach and duodenum are diseased. Although gastroscopy is an invasive test, it is not as painful as one might think, mainly because the gastric tube brings some discomfort when entering, such as pain, dryness and vomiting. If the lesion is not complicated, the examination can be finished in ten minutes. Before the examination, the doctor will give a gel with anesthetic effect, which can reduce the irritation of the throat and suppress the symptoms of nausea and dry vomiting, so the gastroscopy is not that painful, there is a little bit of nausea when passing the throat, and the stomach will feel a little bloated during the process of gas injection, but this discomfort will disappear soon, and the nausea will disappear after the gastroscope is pulled out. After the gastroscope is pulled out, the nausea disappears, and after the gas is washed out of the stomach before the gastroscope is pulled out, the bloating disappears. If you have a fear of gastroscopy, you can use painless gastroscopy, which is based on the principle of applying anesthetics to put the patient in a state of sleep during the examination, so that the body will not feel discomfort during the gastroscopy, and there will be no significant discomfort after the examination is over and awake. Gastroscopy can directly observe the real situation of the examined area, and further clarify the diagnosis by performing pathological biopsy and cytological examination on the suspected lesions, which is the preferred examination method for upper gastrointestinal lesions.