Gastroscopy may also cause harm, such as damage to the mucosa, triggering disease attacks, gastric bleeding and other symptoms. 1. Damage to mucous membrane: usually due to improper operation or lack of experience in gastroscopy, it may cause some damage to the mucous membrane of the throat and stomach, which can be recovered in about a week, and is mainly manifested as mild abdominal distension and abdominal pain. 2. Triggering disease attack: When gastroscopy is performed, if the patient has special conditions such as heart disease, high blood pressure, pharyngeal edema and pharyngitis, it may trigger the attack of certain diseases. 3. Gastric bleeding: gastroscopy may also cause damage to the blood vessels of the stomach, which may lead to gastric bleeding. If you need gastroscopy, you need to go to a regular hospital for gastroscopy to avoid leading to adverse consequences.