Hi - A large lump in your right breast may or may not have somethig to do with arm pain. However, more importantly, it may signal a new breast cancer. Please call your oncologist ASAP; or, if you're no longer are seeing him/her, report this to your GP ASAP. Once you've had breast cancer, you can't treat a lump in your breast casually; get it checked, OK? Good luck - PJH
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I will, indeed. Wishing you a good outcome - PJH