Generally, gastroenteroscopy can be done in a single visit. Gastroscopy can be used for the diagnosis of diseases of the esophagus, stomach, and duodenum from the bulb to the descending segment, such as reflux esophagitis, chronic gastritis, peptic ulcer, tumors, and polyps. Gastroscopy may also be performed to clarify the diagnosis if symptoms such as epigastric discomfort, nausea, vomiting, epigastric pain, loss of appetite, and acid reflux are present. Enteroscopy can assist in the diagnosis of diseases appearing in the intestinal tract and the corresponding treatment, such as assisting in the diagnosis of enteritis, intestinal polyps, intestinal cancer, etc., and can be carried out under the enteroscopy to remove polyps and stop bleeding and other treatments. Although gastroscopy and enteroscopy are two different endoscopies with different examination sites, they can be performed on the same host, and gastroscopy can be performed first, and then enteroscopy can be performed after adjusting the position of the hospital bed after the gastroscopy. It should be noted that for the old and weak, upper gastrointestinal bleeding, accompanied by cardiopulmonary diseases, etc., it is not recommended to carry out gastroscopy and enteroscopy at the same time, so as not to aggravate the burden on the body.