Monica, In my case it's my shoulder. I have had pain in my shoulder before, and get it from other things like shoulder purses, which I don't use any more, and bra straps, but scanning and pressing down on the books makes it worse, which is my I now validate and don't scan, except for pages for people. Also, I switched from the kind of mouse one moves on a pad to what is called an Orbit optical mouse, because moving the mouse also caused shoulder pain. But elbow pain, no. I only got that from tennis, smile. G.Cindy To unsubscribe from this list send a blank Email to bksvol-discuss-request@xxxxxxxxxxxxx put the word 'unsubscribe' by itself in the subject line. To get a list of available commands, put the word 'help' by itself in the subject line.