Complications after gastroscopy mainly include the following aspects: first of all, patients undergo gastroscopy process, the fiber catheter will be on the trachea, esophagus, stomach and other organs and tissues caused by stimulation of the impact of the majority of patients after the completion of the examination, will appear to have a sore throat, nausea, vomiting, acid reflux, vomiting, such as the adverse symptoms of bitter reaction. Secondly, some of the patients need to carry out biopsy test, due to the upper gastrointestinal tract local tissue, by the external traumatic injury, so it may cause the patient’s stomach, the emergence of transient stuffiness, pain, burning and other symptoms. Then, for patients who have undergone gastroscopy, it is necessary to resume normal dietary function after an interval of 2 hours to reduce the probability of adverse symptomatic reactions. Finally, if the adverse symptoms persist for more than 3 days, it is necessary to go to the hospital for a follow-up examination in a timely manner in order to avoid the occurrence of adverse consequences.