To force blood back again on your coronary heart, your veins count predominantly on bordering muscles as well as a community of 1-way valves. As blood flows through a vein, the cup-like valves open to allow blood by, then shut to forestall backflow. Weak or weakened valves can cause varicose veins. Arteries have https://www.sgvascularctr.com/varicose-veins-explained/