Introduction to Starting Upper Gastrointestinal Endoscopy: Proper Insertion, Complete Observation, and Appropriate Photographing.

Diagnostic upper gastrointestinal endoscopy is the most basic of endoscopy procedures and is the technique that trainee doctors first learn. Mastering the basics of endoscopy is very important because when this process is imprecise or performed incorrectly, it can severely affect a patient's health or life. Although there are several guidelines and studies that consider these basics, there are still no standard recommendations for endoscopy in Korea. In this review, basic points, including proper endoscope insertion, precise observation without blind spots, and appropriate photographing, for upper gastrointestinal endoscopy will be discussed.