Reduced aminotransferase but slowly increasing bilirubin may be caused by severe hepatitis, hemolytic disease, biliary obstruction, etc. 1. Heavy hepatitis: heavy hepatitis causes the decrease of aminotransferase produced by the liver, the destruction of intrahepatic bile ducts due to massive necrosis of hepatocytes, so that bilirubin refluxes into the bloodstream, etc., and the phenomenon of reduced aminotransferase but slowly increasing bilirubin may occur. 2. Hemolytic disease: taking fatty food, staying up late and other triggers may lead to liver function damage combined with hemolytic disease, after removing the triggers, there may be a decrease in aminotransferases but a slow increase in bilirubin. 3. Biliary tract obstruction: If the elevated aminotransferase is combined with biliary tract obstruction diseases such as gallstones and biliary tract tumors caused by poor living habits, it may lead to the obstruction of bilirubin discharge into the bloodstream, resulting in the phenomenon of lowered aminotransferase but slowly elevated bilirubin. There may be other reasons for the decrease in aminotransferase but slow increase in bilirubin, so it is necessary to go to the hospital to further improve the blood routine, coagulation function, abdominal ultrasound, CT and other items to find out the cause.