Gastroscopy is generally not recommended in children, unless there is a foreign body, or other possible anatomical problems are suspected, and gastroscopy can be perfected. It is generally recommended to give nasogastroscopy because the nasogastroscope is relatively thin in diameter, about 0.6-0.8 cm, while the normal adult gastroscope is about 1.1 cm, which is relatively thick and not suitable for the anatomical structure of children. Most of the gastroscopes for children are nasogastroscopes that go through the mouth into the esophagus and then into the stomach to observe some conditions related to the stomach and to remove foreign bodies. For children suspected of having other possible diseases, barium meal examination or abdominal CT examination can be used to assist in diagnosis and treatment, and if necessary, gastroscopy needs to be improved.