Nonalcoholic steatohepatitis (NASH) is a condition characterized by the buildup of fat in the liver, inflammation, and damage to liver cells. It is considered a type of nonalcoholic fatty liver disease (NAFLD).

Risk factors for the development of NASH include obesity, diabetes, metabolic syndrome, and high cholesterol. In some cases, NASH can progress to cirrhosis and liver failure.

Diagnosis of NASH is typically done through imaging studies, such as a liver ultrasound, CT scan, or MRI, and may also include liver biopsy.

Treatment for NASH typically includes lifestyle changes, such as weight loss, exercise, and a healthy diet, as well as medication to control diabetes and high cholesterol. 

In advanced cases, this may progress to liver cirrhosis and liver transplantation may be necessary.

It is important for healthcare professionals to be aware of the risk factors for NASH and to screen and monitor patients who may be at risk for the condition.