Gastroenteroscopy is essential for patients with symptoms of gastrointestinal discomfort or with underlying digestive disorders. Gastroscopy is a routine and accurate test for diseases of the esophagus, stomach, and duodenum, while colonoscopy is a comprehensive look at all lesions from the anus to the ileocecal valve. If symptoms such as regurgitation, acid reflux, loss of appetite, or even weight loss occur, then a gastroenteroscopy is needed. Gastroenteroscopy is the primary method of determining upper abdominal discomfort and can detect the possibility of gastritis, peptic ulcers, gastric polyps, gastric cancer, and other diseases. Gastroenteroscopy can not only visualize mucosal lesions, but also take biopsies. Under the direct vision of gastroenteroscopy, it is possible to stop bleeding points of all kinds, remove foreign bodies from the stomach, and for smaller polyps, they can be completely removed by circling electrocoagulation, and endoscopic mucosal resection can be carried out according to the situation of larger benign tumors and early stage cancers. Relax and cooperate with your doctor during gastroenteroscopy.