In general, gastroscopy is not damaging, but risks such as allergies, throat injury, and bleeding cannot be ruled out. Gastroscopy is a test in which a tube with a camera is inserted into the stomach to observe lesions in the esophagus, stomach, duodenal bulb, etc. It can be used for diagnosis of reflux esophagitis, gastritis, gastric ulcers, duodenal ulcers, and other diseases. The examination allows for pathologic biopsy as well as removal of polyps. In general, gastroscopy is not harmful, but it does not exclude the symptoms of gastroscope damage to the throat, sore throat, hoarseness and other symptoms during the examination, and it may also lead to mucous membrane damage in the stomach, esophagus and other parts of the stomach, abdominal pain, vomiting blood, blood in the stools, black stools and other complications. In addition, there is a risk of allergy, respiratory depression and other side effects during the painless gastroscopy. It is recommended to seek prompt medical attention for any discomfort.