sometimes when my nipples get hard when i'm cold my breast hurt VERY bad. the pain is so bad at times it brings tears to my eyes. i haven't felt any lumps but it worries me due to both of my grandmothers had breast cancer. what could be causing the pain? sometimes when i rub on them it makes the pain go away & sometimes it doesn't. then sometimes when i rub to try to make the pain go away i can feel the pain thru my entire breast.