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