I think I may have carpal tunnel . Not to sure though. my symptoms are. If I am using my hands for a good period of time, using the same repetitive movements, my hands cramp up, and stiffen. Also everytime i use my hands or thumbs for any reason, I have to crack my thumbs. and they do crack everytime, I could crack them over and over again. The thumb cracking has been so bad that it is actually a habit now. Any suggestions ? or maybe a possible diagnosis, so I cant treat my problems.