It could be a pulled muscle, but if it has lasted longer than a muscle strain would, then I'd suggest you call the doctor. That's who should decide if tests are necessary and which ones. This could be a problem with scar tissue or even something in your ribs like costochondritis (an arthritis-like inflammation of the cartilage in the rib cage.) Of course, it is possible that it is cancer related, so get the doctor to check you. In the meantime, try not to worry because there are so many things it could be other than cancer. Let us know what you find out.
Peg, I have rib pain on the cancer side that's come and gone over the years; my lymphedema massage therapist says it's probably from radiation. There are just so many long-term side effects you never hear about when you're going through treatment; gradually, over the years, they start to rear their nasty little heads... or not. Some women are lucky. Hopefully you'll get past this current pain, and join the ranks of women who can truly put cancer behind them! Take care- PJH
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