Veins return blood from the remainder of the system to the center. To return blood to the center, the veins during the legs will have to function versus gravity. Weakened valves, also known as incompetent valves, inside the veins may well trigger varicose veins. النزيف. في حالات نادرة، تنفجر الأوردة https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/