why was caffeine causing hand cramps?
Theory is that caffeine lowers peripheral blood flow, less blood to the hands the slower they heal. I was also playing a lot of starcraft which would be the equivilant of typing over 100 words per minute and the two combined caused my hands to really start hurting.
I had found a study on chainsaw operators and the ones who smoked and or drank coffee had a much higher rate of hand injuries.
So i put the theory to the test. I drank less coffee and my hands got better quite quickly. I did a lot of grip exercises while i was off coffee and now it is no longer an issue for me.