Cirrhosis is a condition where the liver becomes scarred and damaged, which prevents blood from flowing through it easily and causes increased pressure in the portal vein. It is often caused by alcohol abuse, hepatitis C, obesity, or genetic factors. Common symptoms in later stages include weakness, fatigue, nausea, vomiting, weight loss, and abdominal pain. Treatment aims to slow further scarring, manage complications, and may involve liver transplantation in severe cases.