For 2 days now I am experiencing some pain under my left arm, right in the pit. To move my hand over my head it gets a little more intense. I woke up with it yesterday but this morning was practically non-existent. but as the day wore on, it came back and just seem a little intense at times depending on my movements. I did not hurt it nor was I doing anything strenuous to cause it. This is new so there are no reports, etc. Can you help anyway? Thanks.