I find a very large percentage of wrist pain is caused by inflexible shoulders and that is the first place that I look at and address. If the shoulders aren't flexible then that automatically puts the wrists in a state of hyper flexion which would hurt anyone. I have the athlete show me their bridge and if they can't get their shoulders past their wrists, there you have it. My experience shows me that accounts for about 80% of the problem. The other times you can see it from weak kids, improper technique (jumping straight up and down, too long on their hands, etc.), or rarely an anatomical problem. Wish you good luck with it.