Veins return blood from the rest of the entire body to the center. To return blood to the guts, the veins during the legs have to get the job done versus gravity. Weakened valves, also known as incompetent valves, within the veins may well cause varicose veins. تساهم التبرّعات، وهي https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/