Hypoalbuminemia is a low level of albumin in blood due to proteinuria. Low albumin in the blood causes fluid to move from blood into tissues, thus causing swelling. The kidney perceives the decrease of fluid in the blood and aggressively retains as much fluid and salt as it can. This contributes to the body's fluid-overload state. A low sodium diet, fluid restriction and diuretic medicines are basic measures to cope with hypoalbuminemia.