If the condition permits, ultrasonic endoscopy of the digestive system should be performed when necessary. Ultrasound endoscopy is a common digestive examination technique with a wide range of applications, and is now mainly used for staging and diagnosis of tumors, diagnosis of pancreatic and biliary diseases, differential diagnosis of augmentation lesions, and ultrasound endoscopic interventions. Usually, 4-6 hours of fasting is required before the examination, and blood routine and liver function are checked. It is prohibited for patients with the presence of cardiopulmonary diseases, inability to tolerate endoscopy, corrosive esophagitis, acute stage of gastritis, and suspected digestive tract perforation. There are usually no serious complications after ultrasonic endoscopy and no special treatment is needed, but fasting and water fasting are required for 2h after the procedure. Patients should choose the appropriate examination method under the guidance of the doctor in order to detect the disease in time and treat it actively to minimize the adverse effects of the disease.