Gastroenteroscopy is usually referred to as gastroscopy and enteroscopy, and is often used to diagnose diseases such as enteritis, gastric ulcer, gastritis, and intestinal cancer. Gastroscopy is mainly used to check whether the patient has the occurrence of stomach, esophagus, duodenum and other lesions. Usually, electrocardiogram examination, heart examination, and whether there are hepatitis B, tuberculosis and other infectious diseases should be done before gastroscopy. If the patient wants to have a painless gastroscopy, it is recommended that he or she be accompanied by a family member. Enteroscopy is performed through the anus and has a small diameter and is usually used to identify symptoms such as bleeding in the stool. This test is contraindicated if the patient has symptoms of peritonitis. Before gastroscopy or colonoscopy, other tests, such as blood tests, should be performed to determine whether there are contraindications for the patient, and if there are contraindications, other tests should be chosen to clarify the diagnosis of the disease. In addition patients suffering from hypertension, heart failure, respiratory failure, arrhythmia and other diseases need to inform the doctor of their detailed condition before the examination so as not to affect the gastroscopy. Gastroscopy and enteroscopy are the main tools for doctors to carry out stomach and intestinal examination, the specific use of which should be consulted with the doctor.