Fatty liver can cause pain in the liver area, mainly as a feeling of pressure or swelling in the right upper abdomen. The pain is caused by the swelling of the liver due to the significant enlargement of the liver, the fatty infiltration of the liver cells and the overstretching of the liver envelope. In 25% of patients with fatty liver, there are no symptoms and the fatty liver is only found during physical examination or ultrasonography or CT examination. With the development of the disease, patients will gradually develop uncomfortable symptoms, such as weakness, loss of appetite, slight distension and pain in the right upper abdomen, epigastric distension or belching after eating, and individual patients may experience nausea and vomiting. In addition, it can be combined with the manifestations of vitamin deficiency, such as peripheral neuritis, tongue inflammation, stomatitis, and dry cornea. Fatty liver can develop into liver cirrhosis, and symptoms such as jaundice and ascites can appear.