Weak or weakened valves may result in varicose veins. Arteries have blood from the heart to the remainder of the human body. Veins return blood from the remainder of the physique to the heart. To return blood to the center, the veins from the legs have to operate towards gravity. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-from-the-perspective-of-a-vascular-surgeon/