Pain when I'm running

I am 2 years (in sept) Post op. I have discomofort in my chest when i run. I know it's not my heart, I'm pretty sure it's my band. I've always had the pain there when I run since the surgery, but I forgot because I stopped running for a while. I started back up tonight and felt the pain about a half mile into it. Does anyone else have this? Why does it hurt when I run? When I do any other cardio or weights it doesn't bother me at all.

I don't know why you would have pain in your chest area when running versus other types of cardio, but here are some questions that came to mind:

Running outdoors versus other cardio indoors? 

If you run on treadmill does it still cause the pain?

You say you know it's not your heart.. have you had cardiac evaluation to be 100% sure?

I hope you get an answer or answers and please let us know what you find out.

I need to get back to running.. but I just don't like it.  :(  Wish I did like it.