The TBIL in the patient’s title is called total bilirubin in liver function, and the value of total bilirubin is most often considered to be in the range of 0-17.1 umol/L. If it is within this range, the patient’s total bilirubin is considered to be normal. If it is within this range, the patient’s bilirubin is considered to be normal, but if the patient’s bilirubin is further elevated, such as when the patient has hepatocellular necrosis or biliary obstruction, the patient’s total bilirubin will be elevated. If the patient’s total bilirubin is between 17.1-34.2 umol/L, the possibility of hidden jaundice is considered, that is, the patient can not be detected through the naked eye of the skin and sclera yellow coloration, and it is only in the blood sampling of liver function that suggests that the patient’s total bilirubin is elevated. In this case, patients need to be further observed to comprehensively determine the cause of jaundice. In addition, for some patients, if the total bilirubin exceeds 34.2 umol/L, it is considered that the yellowing of the skin and sclera can be detected by the naked eye. In this case, if the total bilirubin and direct bilirubin are predominantly elevated in combination with elevated alkaline phosphatase, it is often considered that the patient has a biliary tract obstruction. The most common cause is stones. Ultrasound or MRCP examination of the upper abdomen may reveal biliary space-occupying lesions, which may be stones or tumors, and further ERCP examination is needed to confirm the diagnosis.