Cholangiocarcinoma refers to malignant tumors of extrahepatic bile ducts originating from the confluence of the left and right hepatic ducts to the lower end of the common bile duct. Cholangiocarcinoma can be divided into three types: cholangiocarcinoma of the hilar region or upper segment, cholangiocarcinoma of the middle segment and cholangiocarcinoma of the lower segment. Primary cholangiocarcinoma is less common, accounting for 0.01% to 0.46% of general autopsy, 2% of tumor patient autopsy, 0.3% to 1.8% of biliary tract surgery, and 1.5 to 5 times of cholangiocarcinoma in Europe and America, and more cholangiocarcinoma than cholangiocarcinoma in Japan. The ratio of male to female is about 1.5~3.0. The age of onset is mostly 50~70 years old, but it can also be seen in young people. What should patients with bile duct cancer pay attention to in terms of diet? The following is explained by Dr. Sun: 1. A considerable part of the formation of cholecystitis and cholelithiasis is related to the high cholesterol content and metabolic disorders in the body, so we should limit the food with high cholesterol content such as fish roe, egg yolk of various eggs and liver, kidney, heart and brain of various carnivores. 2, try to reduce the amount of fat, especially animal fat consumption, do not eat fatty meat, fried food, as far as possible, vegetable oil instead of animal oil. 3, cooking food to steam, boil, stew, braise is better, do not eat a lot of fried, fried, burnt, baked, smoked, pickled food. 4, increase the amount of fish, lean meat, soy products, fresh vegetables and fruits and other foods rich in high-quality protein and carbohydrates, to ensure the supply of heat, so as to promote the formation of liver glycogen and protect the liver. 5, eat more tomatoes, corn, carrots and other foods rich in vitamin A to keep the gallbladder epithelial cells sound and prevent the epithelial cells from shedding to form the core of stones, thus inducing stones, or making stones increase in size and number.