I had proton therapy at UFHPTI in March/April of this year. The only issue related to hands that I experienced was that both of my hands suddenly cramped and turned into useless claws when I was driving home. I've never had my hands cramp like that before and am not sure what, if anything, proton therapy has to do with it other than I was drinking a lot more water than usual during treatment. To alleviate the cramping and restore the use of my hands, I ate some salt. This is something I've learned to do with leg cramps in the past. I start with a quarter teaspoon of salt and chase it with some water. With me, the cramps go away almost immediately. And I know to take some electrolytes as soon as possible and so carry Medi-Lyte(R) packets, each which contains two little pills consisting of small amounts of Calcium, Potassium and Magnesium. Now I also carry a bottle of Sodium Chloride (salt) 1 gram tablets for emergencies. This takes care of the muscle cramping. The only other issue I'm experiencing is I walk slower and notice both hips are fatigued on long walks. I attribute this to the proton beams shooting in through my hips on each side for 29 sessions. Bike riding is fine, so I do that more than even thinking of going on hour long walks anymore.