Severe fatty liver is more serious. Severe fatty liver means that fat accounts for more than 25% of the weight of the liver, and all cells in the liver become fatty, which can cause damage and necrosis of liver cells and steatohepatitis, manifesting as abnormal liver function, as well as jaundice, loss of appetite, nausea, vomiting and other symptoms, and liver cells can gradually become fibrotic and can lead to cirrhosis. However, fatty liver is also a benign disease that can be reversed if cirrhosis has not occurred before. Severe fatty liver can also be reversed so that the liver cells return to normal, but the recovery time may be longer. Therefore, once fatty liver is diagnosed, it is important to pay attention and intervene early, mainly through diet control, exercise, alcohol cessation, as well as discontinuing suspicious drugs and controlling blood sugar, so that fatty liver can avoid cirrhosis.