Patients with mild fatty liver usually do not have abnormal liver function. This is mainly because mild fatty liver does not cause serious damage to liver cells, inflammation of the liver will not be obvious and liver function abnormalities will not usually occur. If a patient with mild fatty liver develops abnormal liver function, it is recommended to rule out other diseases such as viral hepatitis: hepatitis B, hepatitis C, hepatitis A, hepatitis E, etc., drug-related liver damage, alcoholic liver damage, cirrhosis, autoimmune liver disease, etc. After ruling out these diseases, it is considered to be caused by fatty liver and can be treated with liver-protecting and enzyme-lowering drugs.