Bile drainage can be performed through both medical interventions and interventional procedures, which generally involve draining the obstructed bile to the duodenum or outside the body. Patients who need this type of treatment often present with obstructive jaundice, e.g., generalized yellowing of the skin and sclera to varying degrees with itching. This is mainly due to obstruction of the biliary system for various reasons, and can usually be treated accordingly in the gastroenterology department or the department of interventional medicine. 1. Internal medicine intervention, commonly performed by ERCP with choledochotomy stenting to drain bile from the gallbladder to the duodenum to resolve the obstruction. 2. Interventional surgery, i.e., percutaneous hepatic puncture under ultrasound guidance to drain the obstructed bile directly outside the body. The specific method to be used should be decided according to the specific condition under the guidance of specialized physicians.