Veins return blood from the rest of the entire body to the guts. To return blood to the heart, the veins inside the legs will have to perform versus gravity. Weakened valves, also called incompetent valves, in the veins might lead to varicose veins. Mayo Clinic functions with many insurance https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/