My dad is in remission from lung cancer after a CT scan was taken in late August. At or around the same time, my dad mentioned that his breasts and nipples were tender and sore. Could this be a side effect from the chemo. They symptoms developded roughly around the same time he had his scan, so I don't believe it is breast cancer. Has anyone had this experience. I'd really like to know. He goes to his oncologist in a few weeks, but when he just told me about the problem I immediately became concerned.