Cholestasis, as the name implies, is the inability to drain bile, and is divided into internal and surgical cholestasis, as follows: 1. Internal cholestasis is a medical condition, and is treated with medication, usually for cholestasis at the capillary bile duct level, because of capillary cholangitis, which causes inflammation of the capillary bile ducts and prevents bile from draining into the bile ducts. The cholestasis is caused by the blockage of the extrahepatic bile ducts, resulting in jaundice and cholestasis, which should be treated surgically, so it is important to distinguish between medical cholestasis and surgical cholestasis. Therefore, it is important to distinguish between medical and surgical cholestasis. Internal treatment is required for medical cholestasis and surgical treatment is required for surgical cholestasis, so as not to delay the disease.