Veins return blood from the rest of the physique to the center. To return blood to the center, the veins inside the legs ought to get the job done versus gravity. Weakened valves, also referred to as incompetent valves, inside the veins might bring about varicose veins. النزيف. في حالات https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/