My finger tips sometimes are numb. Personally, I'd like a virtual keyboard where I don't need to touch anything. Any advanced Leap Motions or laser keyboards being developed?
And there are all sorts of reasons why zero-feedback keyboards are a bad idea, but that's a whole separate discussion. If you REALLY want a laser keyboard, ...aw http://www.seeedstudio.com/depot/laser-keyboard-kit-p-1638.h... is out of stock. There are plenty like it, though.
I experienced pain in my shoulder, then, eventually, numbness in my left index finger. It was a pinched C6/C7 nerve, and I've been effectively unable to work for four years.
I'm serious. Go see your doctor, then examine your computing habits very closely.