Weak or damaged valves can lead to varicose veins. Arteries carry blood from the guts to the remainder of the entire body. Veins return blood from the remainder of the entire body to the center. To return blood to the center, the veins during the legs should perform from gravity. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/