Veins return blood from the rest of the physique to the guts. To return blood to the guts, the veins in the legs will have to work versus gravity. Weakened valves, also known as incompetent valves, throughout the veins may well cause varicose veins. كلية مايو كلينك للدراسات العليا في https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-answers-to-your-most-common-questions/