Nonalcoholic steatohepatitis (NASH) is a liver condition characterized by the accumulation of fat in the liver, leading to inflammation and damage. It occurs in individuals who consume little to no alcohol and is often associated with obesity, diabetes, and high cholesterol. NASH can progress to more severe liver diseases, including cirrhosis and liver cancer. Diagnosis typically involves blood tests, imaging studies, and sometimes a liver biopsy. Treatment focuses on lifestyle changes, such as weight loss, a healthy diet, and regular exercise, to reduce liver fat and inflammation. Early intervention is crucial to prevent complications.