The normal value of direct bilirubin is 0~6.8μmol/L. 7.9μmol/L suggests that direct bilirubin is mildly elevated, which may be related to staying up all night, drinking a lot of alcohol, etc., or hepatocellular jaundice and cholestatic jaundice. 1.Hepatocellular jaundice: due to hepatocellular lesion, the function of bilirubin uptake, binding and excretion is impaired, so that part of unconjugated bilirubin is retained in the blood. And due to the destruction of normal structure of liver cells in the liver lobules and liver necrosis, the bound bilirubin can not be discharged into the small tubules normally, but flows back into the hepatic lymphatic fluid and blood, resulting in jaundice. 2. Cholestatic jaundice: when the bile duct is obstructed, bile will be stagnated in the bile duct, the pressure in the bile duct will increase, and when it reaches a certain level, the small bile ducts and capillary bile ducts will rupture, and the bile will flow back into the body circulation either directly or by the lymph fluid, which will lead to jaundice due to the increase of bound bilirubin in the blood. For example, obstruction in the bile duct is caused by cholelithiasis, biliary roundworm disease, cholangitis, pancreatic head cancer and other causes of bile duct compression and so on. Excluding physiological factors such as staying up late and drinking a lot of alcohol, if direct bilirubin is still elevated, or accompanied by other symptoms, you should go to the hospital in time, under the guidance of a professional physician to clarify the cause and give targeted treatment.