I m 18 & About five months ago I woke up because my arm was hurting a little and I looked at it and the veins from my wrist to the fold of my arm where very visible, usually you can barely see them, after maybe 20 minutes they began to be less visible, but only on the left arm. Now, my right arm had a small pain and the veins are doing the same as they did before, they re more visible than normal. Could someone help me learn what s going on?