Normal people produce about 250-350mg per day, of which 80%-85% of bilirubin comes from the lysis of senescent erythrocytes, about 10%-15% from the bone marrow ineffective hematopoiesis and a small amount of haemoglobin-containing proteins such as myoglobin, peroxidase, cytochromes and other destructive decomposition, also known as the “bypass bilirubin”. Total bilirubin is divided into unconjugated bilirubin and conjugated bilirubin. The normal range of bilirubin is as follows: total bilirubin is 1.71-21 μmol/L (0.1 mg/dl-1.0 mg/dl), conjugated bilirubin is 0-7.32 μmol/L (0-0.2 mg/dl), unconjugated bilirubin is 0-13.68 μmol/L (0-0.8 mg/dl). (/dl) When the following conditions can cause an increase in blood bilirubin: 1, hemolytic diseases: due to defects within the red blood cells themselves (such as certain enzyme deficiencies or hemoglobin abnormalities) or red blood cells damaged by exogenous hemolytic factors (such as malaria, immune hemolysis, snake venom, aniline, etc.) 2, liver disease, such as viral hepatitis, drug-induced hepatitis, alcoholism and cirrhosis of the liver, etc. 3, biliary tract obstruction disease Such as stones, roundworms, inflammation, tumors and bile duct stenosis due to surgical trauma. If you find that the blood bilirubin is elevated, it is necessary to timely examination and timely treatment, so as not to delay the condition.