Dear 4abee: There are many possible explanations for pain and without examination, we cannot speculate on possible causes. Our advice is to contact your doctor for evaluation.
I am not an expert, but my experience may help you. I suffered with pain (RT side) from my breast bone, around to my spine. It took over two years for my diagnosis. I had 3 fractured ribs. A fracture anywhere on the rib can cause radiating pain all around. If you (like me) had radiation to the chest wall for breast cancer, you may have weakened ribs. I am told that this side effect is very rare. (Maybe just under-diagnosed). Good luck!
I have pain in my left breast after a mastecomy 8 years ago. I have a saline implant. The pain radiates to my upper abdomen. susie