Fatty liver can also cause elevated bilirubin. Mild fatty liver can have no symptoms and normal liver function, but as fatty liver worsens, the area of hepatocytes infiltrated by fat cells gradually increases and the degree of hepatocellular enlargement also increases, and symptoms of weakness, abdominal distension, nausea, vomiting and decreased appetite can occur. Liver function can also be abnormal, manifested by predominantly elevated glutathione transaminase and mildly elevated alkaline phosphatase and transpeptidase. In case of severe fatty liver, fat can account for more than 25% of the liver weight, all liver cells are infiltrated by fat cells, and liver cell damage is also severe, and jaundice can appear, showing elevated total bilirubin. Long-term fatty liver develops liver fibrosis, which can further lead to liver cirrhosis and even malignant liver cancer. Therefore, once diagnosed, fatty liver must be treated, not necessarily with medication, but generally through dietary control and exercise to prevent fatty liver aggravation and prevent the development of cirrhosis, which is irreversible once it progresses to cirrhosis.