I know when I hold books to read for any length of time { even w/pillow to support the book} I tend to get extra swelling /puffiness/tenderness in my armpits -I think it might be some pec minor or lymph combo...
I do the lymphatic massage on myself when it happens and also extra pec minor stretches to reverse it - usually a couple days of that and those sx fade away.
i think there is a description or link in the stickys.
Or - videos -
http://video.google.com/videosearch?...20&hl=en&emb=0