I am a 41 year old healthy, non-smoking, non-drinking female who has had yearly mammograms, all normal so far. A couple of days ago while shaving I noticed a painless, slightly swollen lymph node on the upper-right part of my armpit. It's not hard or in any particular shape, just slightly swollen. You can only see that it's swollen when I extend my arm upwards. I tend to be somewhat of a hypochondriac because of my family's history of disease - pancreatic, lung and breast cancer among them, so I don't want to go rushing off to the doctor at every minor thing. Do you think I should wait and see if it gets larger before I have it examined? If so, how long should I give it? Could this be an indication of breast cancer? I have no other symptoms that I am aware of. Thanks you in advance for your reply.