If the patient has symptoms such as yellowing of the whites of the eyes and yellowing of the urine, it may be caused by jaundice. Normally, the aging of body cells produces a certain amount of bilirubin, which is within the normal metabolic range and does not lead to yellowing. However, elevated bilirubin can lead to color changes in the body, such as yellowing of the whites of the eyes. In addition, bilirubin is excreted through urine, if the concentration of bilirubin is elevated, it will also cause yellowing of urine.1. Pre-hepatic jaundice: i.e. hemolytic jaundice, the causative factors are common infections, medications, immunity, etc. A large amount of destruction of red blood cells in a short period of time will produce too much bilirubin and indirect bilirubin is the main one, and at the same time, more than the liver’s ability to transform and excrete, which will lead to the manifestation of yellowing of whites of the eyes, yellowing of urine and so on;2, Hepatocellular jaundice: it is common in all kinds of acute and chronic hepatitis, mostly due to viruses, infections, drugs, alcohol, immunity and other factors. After liver cells are damaged, the ability to metabolize and excrete bilirubin is impaired, and direct bilirubin and indirect bilirubin will be elevated at the same time, and patients can see yellowing of the whites of the eyes, yellowing of the urine and other symptoms; 3. Post-hepatic jaundice: it is mainly seen in obstructive lesions, such as stones, tumors, parasitic infections and so on, which lead to blockage of the bile ducts, and the bilirubin can’t be excreted normally, resulting in the elevation of direct bilirubin. Patients will also have symptoms of yellowing of the whites of the eyes and yellowing of the urine, at which time the site of obstruction can be clarified by imaging examination.