There are many causes of fatty liver disease, and the degree of harm varies according to the different causes. Non-alcoholic fatty liver is closely related to metabolic syndrome and often occurs in diseases such as hyperlipidemia, diabetes, coronary heart disease, and hypertension. It can easily lead to reduced arterial elasticity and increased risk of heart attacks, strokes, or sudden death. Fatty liver can also exacerbate liver damage. Long-term fatty liver may lead to liver fibrosis and eventually cirrhosis. If combined with chronic hepatitis B or chronic hepatitis C, the progression to liver fibrosis may accelerate.