What Causes the Veins to Bulge in the Hands and Arms?

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According to Scientific American, veins bulge on the arms and hands as well as other body parts, such as the legs, during and directly after a workout because of the increased arterial blood pressure's physiological mechanisms. WebMD identifies other possible causes of bulging veins in various areas of the body, including blood clots, varicose veins and peripheral venous disease.