I would hazard a guess but if you think this is something serious or more than just a casual bodily ache from bodybuilding...
Go see your qualified physician! - Honestly I can't stress that enough.
We could guess here all day long and not get close. You need to examine all of the surrounding data to narrow down the cause for a resolution.
1. Is this after working out chest?
2. Is this muscle, bone or ligament?
3. Could it be your lungs rubbing on your ribcage, I have had that before.
4. Are you using the kitchen sink approach with your supps, if so cut back to the basics and walk through adding them back in step by step?
5. Do you do heavy pullovers?
6. Have you tried filling your lungs then stretching out your chest muscles? helps me.
7. Is this a liver issue?
8. Are you drinking more than 2 gals water a day?
9. Have you ever felt this way before?
10. Have you recently suffered from the flu or a cold bug?
11. Where do babies come from? What does a vaj look like?
ok ok so 11's a joke
but you get the idea.....
Amor Est Vitae Essentia,
Neoborn