My veins are popping out

What does this mean? First I started noticing it on my arms, and now on my legs and stomach. I'm not sure if this means anything or not?
Also I got a radioactive dye 'shot the other day, because I had to get a bone scan... they said it would have no side effects but could this be one of them? I've also been overly hot lately and my *gasp* breasts are really tender...

Any ideas?

 

Well, unless you've been working out and have very low body fat percentages, it's probably not a good thing. Especially if you're having trouble breathing. Consult a doctor, it could be a heart problem.

 

Well I haven't been working out that hard so that's not the problem. I don't really think I'm having trouble breathing either. Hmm