Fatty liver disease is a condition in which fat accumulates in the liver cells, leading to inflammation and scarring of the liver. It is also known as steatosis or fatty liver. It is the most common form of liver disease in the United States, affecting up to 25% of the population. It can be caused by excessive alcohol consumption, obesity, diabetes, high cholesterol, and certain medications. It can also be caused by certain viral infections. Symptoms of fatty liver disease can include fatigue, abdominal pain, and jaundice. Treatment typically involves lifestyle changes such as weight loss, exercise, and a healthy diet.