Signs and Symptoms of Liver Disease The liver is the largest and one of the most essential organs present inside the human body. It has many functions such as the formation of blood clotting factors, triglycerides, proteins as well as cholesterol. It also plays an important role in bile production and synthesis of glycogen. It is present on the right side of the belly in the human body. Liver disease is also known as hepatic disease. These diseases are of different types such as fatty liver disease and cirrhosis and are mainly caused by viruses (hepatitis A, B, and C),