When it comes to gastrointestinal endoscopy, the general public is still under the impression that “gastroscopy can check whether there is a stomach disease”, thinking that it is a means of examination. But in fact, in the hands of gastroenterologists today, gastrointestinal endoscopy is an all-around little helper. It can diagnose and treat diseases, even some difficult diseases such as tumors, it can handle. Let’s take the tumor that everyone is afraid of. If I tell you that a patient with early gastric cancer may not need an operation, but can be removed with a “hose”, you may not believe it. But in fact, this is one of the “main battlegrounds” of gastrointestinal endoscopy nowadays. This is because when the malignant tumor is still in the early stage, the tumor is still in the mucosal layer, and there is no extensive infiltration or metastasis of the surrounding tissues. At this time, the stomach is like a fruit that is about to deteriorate but not yet spoiled, although the skin is discolored, the flesh is still intact, and all we have to do is to “peel off the bad skin”. This is the stage for gastrointestinal endoscopy. These soft mirrors are delivered through the natural channels of the digestive tract, causing no additional trauma; the diseased mucosal tissue is removed microscopically, and the mucosa of the digestive tract has a strong ability to repair and regenerate, and soon a healthy new mucosa will be regenerated. In this way, the patient will be cured, won’t it? In addition, gastrointestinal endoscopy can also assist in the treatment of some diseases. In the case of gallbladder stones, the gallbladder is usually removed laparoscopically, but sometimes during the treatment process, the stones in the gallbladder “slip” into the bile duct and become stones in the bile duct. In this case, gastrointestinal endoscopy can assist in “pulling out” the stones from the bile duct, allowing the patient to solve a new post-operative problem without having to undergo surgery twice. In addition, even in the “old” field of gastrointestinal endoscopy – diagnosis – they are playing an increasing role. For example, I have met individual patients with bile duct polyps who were not found to have other problems during routine surgery, but postoperatively we found that other patients had their postoperative drains disposed of normally, but these patients were always poorly treated, and then we would use the gastrointestinal endoscope to make another diagnosis to see if they had some latent malignant lesion, such as duodenal papillary cancer. This keeps the patients from being missed and gains them valuable time for treatment.