Cirrhosis is a chronic liver disease characterized by scarring of the liver and loss of liver function. It has a prevalence of 0.27% in the United States. Common causes include chronic alcohol use, hepatitis B and C, and nonalcoholic fatty liver disease. Cirrhosis results in complications like ascites, portal hypertension, and hepatic encephalopathy due to fibrotic changes and elevated portal pressure. Treatment focuses on managing complications, lowering portal pressure, and potentially liver transplantation for advanced disease.