You have lymphnodes in your armpits. For some reason they could be swelling... but, I wouldnt have a clue as to why. Generally they are used by the body as an immunity mechanism of somesort I believe.
But, if you don't feel anything in there, maybe it isn't the nodes...
I dunno what it could be... that is strange. I don't have this happen to me when I am PMS'ing.
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