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