Veins return blood from the remainder of the entire body to the guts. To return blood to the heart, the veins during the legs should operate against gravity. Weakened valves, also referred to as incompetent valves, throughout the veins may bring about varicose veins. In a different way sized testicles. https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/