What makes your veins pop up and sore?

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Answers.com > Wiki Answers > Categories > Health > Conditions and Diseases > What makes your veins pop up and sore?

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Sore veins in your arm?  What causes sore veins?  Why do your veins pop out and hurt?  What causes enlarged and sore veins in the arm?  What does it mean when red veins pop out your leg?  Why do some people have veins that pop out of their biceps and shoulders?