Constriction: Place a tourniquet between your heart and the vein and then pump your fist or leg. Take the tourniquet after a minute or so. It's not safe to leave it on too long.
Answered 12/29/2013
4.6k views
"Popping Veins": The most simple way to enlarge veins is to increase hydration. Exercise, straining and warm temperature will also cause veins to enlarge.
Answered 3/1/2021
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