Total bile acids are the end products formed by the breakdown and metabolism of cholesterol in the liver. Under normal circumstances, since the liver can effectively take up bile acids, the content of bile acids in the serum is small and not easy to detect. the normal range of fasting total bile acids is 0-9.67μmol/L. If the total bile acids test result is 30μmol/L, it is a more serious situation, and the common causes are as follows: 1. liver diseases: such as acute hepatitis, moderate chronic hepatitis, cirrhosis of the liver, fatty liver When liver diseases such as acute hepatitis, chronic hepatitis moderate, cirrhosis, fatty liver, hepatocellular carcinoma and toxic liver disease, liver function decreases, so that when bile acid intestinal liver circulation, the ability of liver cells to take up and remove bile acid decreases, which is manifested as a significant increase in total serum bile acid level; 2. If the total bile acid test result is 30 μmol/L, it is a more serious condition. Patients should undergo a more complete examination to clarify the specific cause so that symptomatic treatment can be given.