The veins have a valve-like mechanism that allows blood to rise toward the heart. Leaflets cover the valves. When the flies lose their elasticity, the valves lose their ability to push blood upwards, resulting in back pressure and further vein elongation. As a result, the veins become twisted and hardened or ‘tortuous.’ As a result, the veins become visible as vascular tubes, particularly on the legs.
Varicose veins primarily affect the lower limbs, and the condition worsens when one stands for an extended period. People in the business of standing for long periods, such as salespeople, cops, plastic surgeons (who frequently stand for hours during surgery), and so on.