Saphenous Vein (Great or Minor) affected, has damage in its valves, and is producing a backflow preventing proper circulation of blood through the veins to the heart. This help producing a "stagnation" of blood in the veins of legs, causing symptoms such as fatigue, heaviness, cramps, warmth
In the legs fortunately we have another major venous system, which are the deep veins. These will accompany the arteries, and usually handle 95% of the blood in the veins of the legs. For this reason, we must always verify that this deep venous system is working properly, to make the superficial venous system treatments, such as surgery or endovascular laser, without impairing circulation.