There are usually no signs or symptoms of nonalcoholic fatty liver disease, but when they do occur, they include pain in the upper right abdomen, fatigue and weight loss, according to Mayo Clinic. A person must see a doctor if any symptoms or signs cause concern.
There are three different forms of fatty liver disease, including nonalcoholic fatty liver, nonalcoholic steatohepatitis and nonalcoholic fatty liver disease-associated cirrhosis, claims Mayo Clinic. Nonalcoholic fatty liver occurs when fat begins to build up in the liver, which is not necessarily harmful. When in a simple form, this disease may cause excess fat in the liver without any complications.
Nonalcoholic steatohepatitis is another type of fatty liver disease, but it only occurs in a small number of people, states Mayo Clinic. In this case, the excess fat in the liver causes inflammation, which can impair the ability of the liver to fully function. This can also lead to a condition known as cirrhosis, or the scarring of the liver. The third type of fatty liver disease is nonalcoholic fatty liver disease-associated cirrhosis, which scars the tissue of the liver. Over time, this condition can lead to scarring that is so severe that the liver no longer functions and goes into liver failure.