Weak or damaged valves may result in varicose veins. Arteries have blood from the guts to the remainder of the body. Veins return blood from the rest of the entire body to the center. To return blood to the heart, the veins while in the legs should work from gravity. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/