This particular system is called the venous pump. The pump part of this system works through muscle contraction in the lower legs and thighs. When the muscle strength has been decreased for any reason it can cause pooling of the blood in the lower extremities. People may notice some swelling in their feet and legs after having stood for several hours during the day. This is a result of the blood not returning in an effective and efficient manner to the heart. Researchers know the types of things that can cause damage to the venous valves and trigger the development of varicose veins. By avoiding these triggers you can also help to prevent the development of any varicose veins or help to decrease the progression of the ones you already have.
