The function of leg veins is to facilitate the return of the blood (that has been bought in by arteries) back to the heart. Because the flow of blood in veins is against gravity there is a system of one-way valves in leg veins that allows blood to go up but not come back down. When the calf contracts with walking, the blood squirts up which opens up the valves. When the calf muscle relaxes this same blood is forced down the leg by gravity. In a normal vein any movement down the leg is enough to close the one-way valves. When these valves do no function properly (i.e. they are permanently open) then there is no restriction to blood going down the vein. This extra flow / pressure initially causes the vein to expand, because it is under more pressure, and eventually this pressure will find an “escape route” to the surface which we see as a varicose vein.
VARICOSE VEINS BEFORE AND AFTER TREATMENT