Painless gastroenteroscopy may have harms such as respiratory depression and dizziness due to the injection of anesthesia, improper operation may cause mucosal bleeding, etc. Taking laxatives may cause abdominal bloating, etc. Generally, there are no serious harms, so don’t worry too much. Painless gastroenteroscopy requires injection of anesthesia to relieve the pain caused by the examination process, and respiratory depression and blood pressure drop may occur during the anesthesia process. Generally, temporary dizziness and nausea may occur after the examination due to the effect of anesthetics, but can be relieved after rest. The mucous membrane of the gastrointestinal tract is generally fragile, and if there is gastric mucous membrane lesion, improper operation during the examination may cause bleeding of the mucous membrane, or even perforation. Colonoscopy needs to take laxatives to clean the intestinal tract, which may affect the normal function of the intestinal tract, and symptoms such as abdominal distension and loss of appetite may occur after the examination, so pay attention to a light diet, avoid spicy and stimulating foods, and rest for a few days to relieve the symptoms. Painless gastroenteroscopy has certain hazards, usually in the examination before the doctor will strictly assess the physical condition, under the guidance of the doctor to carry out the examination, generally will not have serious harm, do not worry too much.