Weak or broken valves may lead to varicose veins. Arteries carry blood from the guts to the rest of the overall body. Veins return blood from the remainder of the overall body to the heart. To return blood to the center, the veins within the legs should work against gravity. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/