Fatty liver is categorized into alcoholic fatty liver and non-alcoholic fatty liver, special type of fatty liver, and acute fatty liver. Among them, alcoholic fatty liver is mainly caused by drinking too much alcohol, non-alcoholic fatty liver is caused by heredity, over-nutrition and other factors, special type is caused by taking certain drugs and other factors, and acute fatty liver can be caused by certain diseases. 1. Alcoholic fatty liver: long-term excessive alcohol consumption can lead to liver damage, which can be manifested as alcoholic fatty liver in early stage, and develop into alcoholic steatohepatitis, cirrhosis and other diseases when the disease further progresses. 2. Non-alcoholic fatty liver disease: genetic susceptibility to non-alcoholic fatty liver disease, overnutrition or complications of type 2 diabetes, obesity and other diseases may cause chronic liver injury, leading to the occurrence of non-alcoholic fatty liver disease. 3. Special types of fatty liver: taking drugs such as tamoxifen and methotrexate or exposure to toxic substances such as barium and organic solvents can lead to its occurrence. 4. Acute fatty liver: Acute fatty liver in pregnancy, Reye’s syndrome and other diseases can trigger it. It is recommended to go to the hospital and ask the doctor to make a clear diagnosis when the above factors occur.