Weak or broken valves can result in varicose veins. Arteries have blood from the heart to the rest of the human body. Veins return blood from the remainder of the system to the heart. To return blood to the center, the veins from the legs have to function versus gravity. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/