Endoscopy Endoscopy can visually observe the lesions, and at the same time can take color photos and videos, and can also treat certain diseases through endoscopy. In recent years, new endoscopes have been introduced, such as electronic endoscope, magnifying gastroscope, ultrasonic gastroscope, etc. Some of the new gastroscopes can magnify the fine structure of the gastric mucosa tens of times, and the section of the stomach wall tomography and observation of deep lesions. People who need to perform gastroscopy: those who have upper gastrointestinal symptoms (such as stomach pain, bloating, acid reflux, heartburn, epigastric discomfort, etc.) and cannot be diagnosed by barium meal (upper gastrointestinal tract imaging) or ultrasound examination; those who need to differentiate benign and malignant ulcer lesions; those who need to confirm the diagnosis of suspected early gastric cancer; those who have unclear causes of upper gastrointestinal bleeding; those who observe the efficacy of clinical treatment (such as whether ulcer disease is healed by treatment, whether esophagitis is relieved by acid suppressant treatment, etc.); those who need to be diagnosed by endoscopy. Endoscopic treatment, such as foreign body clamping, electrocoagulation, removal of polyps and introduction of laser to treat pancreatic and esophageal malignant tumors, sclerotherapy for ruptured esophageal varices and ligation of esophageal varices, etc.; diagnosed upper gastrointestinal lesions that require follow-up review or treatment, and those who still have symptoms after upper gastrointestinal surgery and need to be diagnosed. Who are temporarily not suitable for gastroscopy Those who cannot tolerate the examination due to severe heart disease or extreme failure; severe spinal angular deformity or mediastinal disease such as thoracic aortic aneurysm; acute perforation of suspected ulcer or acute stage of swallowing corrosive fluid; those who cannot cooperate due to mental illness or severe intellectual disability; patients with severe hypertension whose blood pressure cannot be effectively controlled.