You need to go to the Department of Gastroenterology to have a gastroscopy. Gastroscopy is mainly used to check for stomach disorders, as stomach disorders are diseases belonging to the Department of Gastroenterology, so you need to go to the Department of Gastroenterology when having the examination. In the night before the gastroscopy, you need to pay attention to eat some easy-to-digest food and not to take in any food after 8 o’clock in the evening, in order to avoid the retention of food in the stomach, which will affect the examination results. Before the examination, you need to use local anesthesia drugs to reduce the endoscope into the throat, esophagus mucosa caused by friction, which causes nausea, vomiting and other manifestations, once found in the stomach of an unknown swelling, should also be extracted part of the biopsy tissue, pathological examination to help determine the disease. After the examination, it is necessary to eat some food after the anesthesia drug effect has disappeared, and try to take fluids or semi-fluids as the main food in the near future.