One year since my lumpectomy/node removal and was told scar tissue forms so soreness is expected..my radiologist warned me I would have alot of soreness from the radiation treatment as well...with any pains (I worry..is it mets?)....if I take an Advil and it goes away, it isn't cardiac...so i use that as my deciding factor if it's something other than residual pains from cancer treatment..but miss Cheryl is correct, ANYTHING that gives you concern, check it out