"scrapper's shoulder?

Hi ladies!

After using your paper cutters a lot, do any of you getting an "achiness" in the muscle between your breast and armpit in your dominant hand?

I noticed this in my left arm in that area (and I'm left-handed) a couple of years ago and got an ultrasound done and they found nothing, but I still get that achiness or "pulling sensation" occasionally and it just recently dawned on me that maybe it's from scrapbooking.

Any thoughts would be great!

thanks!