Non-alcoholic steatohepatitis and non-alcoholic fatty liver disease are both types of fatty liver disease. Non-alcoholic fatty liver disease is characterized by fat buildup within the liver, however, with this condition, no damage to the liver has occurred. Non-alcoholic steatohepatitis is a form of NAFLD that also involves fat buildup in the liver. In this case, liver inflammation, damage, and even scarring are often occur.