Veins throughout your body carry blood from the capillaries in your body to your heart. In your legs, this means the blood has to flow upward against gravity. All veins have one-way valves to prevent blood from back flowing but sometimes time these valves can fail.
This results in what is known as “reflux.” This is a process that allows blood to pool and congests the leg veins with blood. These bulging veins are called varicose veins. Spider veins also result from a pooling of blood but they are red, blue or purple small and thin veins on the surface of the skin.
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