I have a question and was wondering if anyone had an answer. I found a lump on my collar bone(well I thought it was on my collar bone) It turns out that its actually just under the collar bone, where the collar bone and breast bone meets in the middle of your chest. I think (dr also thinks) its a lymph node. It's hard,round and fixated. About the size of a pea. I have had pains in my shoulder and underarm( Swollen lymph nodes there also.) swollen lymph nodes in my neck. I started having breast and nipple pains four days ago(in both breasts). I have never experienced this before. I am 30 years old. I am due to start my period in a few days. Definately not pregnant. Should I be concerned? Thanks in advance = )