If fatty liver disease has symptoms, pain in the upper right part of the abdomen is one of them, says Mayo Clinic. Other symptoms are fatigue and weight loss.
Fatty liver disease can have either an alcoholic or a nonalcoholic origin, according to Mayo Clinic. Doctors have not been able to pinpoint what exactly causes nonalcoholic fatty liver disease. However, there are three types: nonalcoholic fatty liver disease, which often has no symptoms and is harmless; nonalcoholic steatohepatitis, which causes inflammation that can lead to scarring; and nonalcoholic fatty liver disease associated cirrhosis, where the liver becomes so scarred that liver failure can result.