Just echoing what at least 3 other posters said. Take wrist pain seriously, as it can become career ending if not properly managed. Good time to teach your son that constant pain is not okay. Work with coaches proactively to manage. We have had two boys had to quit gymnastics team permanently due to wrist growth plate issues over the last 5 years. Both at around the age of 13/14.
My son went through his huge growth spurt this last year (all my boys grow early). His issue is his elbow, started this season - he has been going to PT, not working it too hard, then took a month off of 100% rest after end of season. He went back and did one workout and still had elbow pain, so physical therapist referred him to the orthopedist and recommended an X-ray & MRI (actually she recommended this before he went back and did the one normal workout).
Scans luckily showed no loose bodies in his elbow or fracture, but it did show chronic inflammation. It is called Little Leaguer's Elbow. No elbow brace will cure this. He is on 100% rest of his arm for 2-3 months until pain is gone. At least no surgery is required, and this will heal with rest. Most likely high bar is the event that caused this. The repetitive motion and torque of the force when they go around the bar is a lot for growing bones/joints.
For the next 2-3 months he will only do conditioning (approved by physical therapist to not aggravate elbow), flexibility, trampoline, and working front tumbling from rebounds into foam pit (no round offs/bhs/etc.) He will go to gym for 1/2 the workout only, but the same number of days. No reason to stand around and watch what he cannot do.
Be observant about your child. My son isn't a complainer even when he should have. I first noticed him rubbing his elbow at a meet. He didn't tell me about it. I let him try to take it easy to see if it would go away for a month or so before we took him to the doctor.
You can use any pain to have a discussion with your child about what pain is okay and what needs to be addressed. This was something I never learned until later in life, good for them to learn how to listen to their bodies now.
There is a time to work hard and a time to rest & heal, so you can work harder later.
Oh, silver lining is from the MRI they said it looks like he is almost done growing which is good news! So once his bones catch up (making sure he gets calcium and vitamin D for this) he is through most of the major growing.