One day ago I started experiencing left armpit pain..directly near the edge of my armpit near my chest. It is intermittent at every 10 minutes lasting only a few seconds, but it is fierce and deep. I took 2 baby aspirin an it was relieved the rest of the day. It has started again this morning. I am a 52 year old woman, in good health, and had a cardiac check up last summer that was good. No cholesterol problems, In fact it is low. I have not had injury to this arm, but do lift weights regularly. I am wondering if nerve pain reacts intermittently like this