What is nonalcoholic steatohepatitis (NASH)?
Nonalcoholic steatohepatitis (NASH) is liver inflammation and damage caused by a buildup of fat in the liver. It is part of a group of conditions called nonalcoholic fatty liver disease. You may be told you have a "fatty liver." Many people have a buildup of fat in the liver, and for most people it causes no symptoms and no problems. But in some people, the fat causes inflammation and damages cells in the liver. Because of the damage, the liver doesn't work as well as it should.
NASH can get worse and cause scarring of the liver, which leads to cirrhosis. But the disease doesn't always get worse.
NASH is similar to the kind of liver disease that is caused by long-term, heavy drinking. But NASH occurs in people who don't abuse alcohol.