The liver produces many different proteins, and one of them is called albumin, and it is the most abundant protein in the blood. Albumin creates something called osmotic pressure, which is a dynamic chemical interaction between solute and solvent that maintains body fluids in place.
When the liver is affected by liver cirrhosis, protein production slows down and the circulating levels of albumin drops. As it does, the liquid starts to escape the blood to the interstitial tissue and swelling appears throughout the body. In severe cases, patients develop a swollen and rounded abdomen as free liquid accumulates in the abdominal cavity.