Approximately 25 million Americans have varicose veins. For some, they're simply a cosmetic concern. But for many others, varicose veins can cause significant pain and discomfort.  Sometimes they even lead to more serious problems. 
Exercise does not cause varicose veins. In fact, exercise may help prevent the problem, while excessive sitting or standing is more likely to aggravate it. The underlying cause is malfunction of the
valves in the veins that normally allow blood to flow only toward your heart. If the valves are defective, blood may pool
in the veins, causing them to dilate and become varicose (meaning twisted and swollen). 

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