ERCP, whose full name is endoscopic retrograde cholangiopancreatography, is used not only to check for diseases occurring in the bile ducts, pancreatic ducts and gallbladder, but also to treat some diseases in these areas. The doctor will pass a special endoscope through the mouth, esophagus and stomach into the duodenum, then cut open the papillary part of the duodenum, enter the bile duct and pancreatic duct area, inject contrast and then perform radiography, which can detect many diseases. For example, common diseases such as bile duct stones and bile duct tumors. During the examination, stones in these areas can be removed by special equipment. Some of the more serious malignant biliary tumors can be restored to the biliary tract by placing stents through this technique to achieve symptom relief and improve the quality of life. ERCP is a well-tolerated procedure that is generally safe to perform. The technique is performed by specially trained and experienced surgeons. In rare cases, some unexpected complications may occur, including post-ERCP pancreatitis, infection, bowel perforation and bleeding. This technique is a more minimally invasive operation with no incision in the abdomen and a faster recovery, allowing for an accurate diagnosis of the disease. Its current use has become increasingly widespread.