Moderate fatty liver is considered a relatively severe condition, mainly caused by the excessive accumulation of fat tissue in the liver. Generally, moderate fatty liver can cause varying degrees of inflammatory changes in liver cells. It can be roughly divided into three stages: the first stage is simple fatty liver, the second stage is steatohepatitis, and the third stage is fatty liver fibrosis, also known as steatotic liver cirrhosis. Many factors can cause fatty liver, such as obesity, alcohol consumption, and drug toxicity. If a patient experiences indigestion, diarrhea, or loss of appetite, the possibility of fatty liver should be considered. It is advisable to visit a hospital for an upper abdominal CT scan or an abdominal ultrasound to confirm the diagnosis. The treatment mainly involves three aspects: removing the cause, dietary adjustment, and medication.