What are the serious complications caused by severe fatty liver that can endanger the health of patients? We all know that fatty liver is caused by excessive accumulation of fatty tissue, which overloads the liver and aggravates liver cell damage, and can be manifested as a significant increase in liver function transaminases and bilirubin indicators. Fatty liver can be classified into mild fatty liver, moderate fatty liver and severe fatty liver based on the amount of fat accumulation and liver function damage. Generally speaking, mild fatty liver has little effect on the body and can be completely cured by improving the damaged liver function through food therapy and strengthening exercise. Moderate and severe fatty liver have a greater impact on the body and require medication. Many patients with mild fatty liver, due to the lack of obvious clinical symptoms, tend to ignore their condition and fail to take timely and effective preventive measures to control liver damage. Once severe fatty liver is formed, it will cause massive proliferation of fibrous tissue in the liver, compressing the bile ducts and portal vessels, resulting in poor bile excretion and increased resistance to return blood flow. Patients will have yellow staining of the skin or sclera, congestion and enlargement of the spleen, portal hypertension and other symptoms, and in severe cases, bleeding from ruptured esophagogastric fundic veins, hypoproteinemia leading to a large amount of abdominal fluid and other serious complications.