[djha-skin]

Mine was more ulnar tunnel (emacs pinky) than carpel. I too had the problem of the hard keys. From what I can tell my problem was that my muscles grew so tight that there was no space for my nerves, causing owner tunnel numbness. Neurologist tested my nerves and found no damage, and the massage therapist I later visited told me that this could happen. It also explains why rock climber's stretches helped me make the problem go away. But to this day it comes right back the minute I turn on emacs.