Ordinary gastroscopy can be tolerated by most people, but those who suffer from chronic pharyngitis, or those with a more sensitive constitution, will experience more intense discomfort during the gastroscopy. During gastroscopy, the patient is awake and the doctor needs to pass the gastroscope from the pharynx through the esophagus to the stomach. During the operation, the gastroscope will touch the posterior pharyngeal wall when it passes through the pharynx, which will cause the patient to experience nausea and vomiting discomfort. Moreover, in order to observe the condition of the gastric mucosa, it is necessary to inflate the stomach during gastroscopy. The patient will burp due to excess gas during the pumping, and too much burping will aggravate the symptoms of nausea and vomiting. Most people can tolerate the discomfort of a gastroscopy. However, if you suffer from chronic pharyngitis, which itself has a sensitive throat and may aggravate the feeling of nausea and vomiting, you may choose to have a painless gastroscopy.