The Liver is located in the upper right side of the abdomen and it is part of the digestive system. It performs several life-sustaining functions: it processes nutrients, produces proteins, stores sugar or glycogen, and it also controls the body's hormone levels, blood sugar levels, cholesterol levels, and fluid retention. The liver filters unwanted substances and helps the body fight infection. Cirrhosis is a chronic, progressive liver disease that prevents the liver from functioning normally. This disease is most often caused by chronic alcoholism, but can also be caused by hepatitis infection and other illnesses.