Fat in the liver is normal, but fat levels that comprise more than 5 to 10% of the organ’s weight is a sign of fatty liver disease. There are two main types of fatty liver disease. Alcohol liver disease (ALD) is caused by excessive alcohol consumption over time or even after a short period of heavy drinking. Nonalcoholic fatty liver disease (NAFLD) is more likely found in people who are obese or overweight who are prone to high cholesterol and diabetes, although a specific cause of NAFLD is not known.

Symptoms can include weight loss, nausea, fatigue and in the center or right part of the abdomen.