Bilirubin generally refers to bilirubin, a different name for the same substance. Bilirubin, also known as bilirubin, is the main pigment in human bile, and is a product of the breakdown and destruction of senescent red blood cells in the blood circulation in the monocyte-macrophage system of the liver, spleen and bone marrow. Bilirubin can be categorized into total bilirubin, direct bilirubin and indirect bilirubin, which is an indicator for evaluating liver function. Clinically, the levels of the above three types of bilirubin can be detected to determine the type of jaundice in a patient. If indirect bilirubin is significantly elevated, it suggests hemolytic jaundice, such as hemolytic anemia; if direct bilirubin is significantly elevated, it suggests the possibility of obstructive jaundice, such as gallbladder stones, bile duct stones, etc.; if both direct bilirubin and indirect bilirubin are significantly elevated, it suggests hepatocellular jaundice, such as viral hepatitis, alcoholic liver, cirrhosis, and liver cancer. Elevated bilirubin can cause some damage to the brain and nervous system. Therefore, if elevated bilirubin is found during the examination, it is recommended to consult a doctor in time to find out the cause of the disease under the guidance of a professional physician and carry out targeted treatment to avoid delaying the condition.