See a doc.

Probably repetitive motions + overuse.

Doubtful it's tendonitis or carpal tunnel, eh.

i had some wrist issues for about 9 months that i'm just barely now escaping, so make sure that once you figure out what is the issue (according to a physical therapist, doctor, or yourself) then rest. Give them a little while, and don't put large amounts of force on them: that means don't do high impact vaults (ideally don't do them at all; just work on things like balance and jumping more) and be wary of how intensely and how long you are gripping something-this aggravated my issues several times over those 9 months.

after a little rest and maybe some contrast baths before going to bed (run under ice cold water for 30 sec or so, then very hot, repeat a few times while ending on hot) begin some kind of wrist exercises. Do what doesn't replicate the movements that hurt: if it hurts to hold a pushup position or put compressive forces (like vaults) on your wrists, then don't do wrist flexion or extension. You might want to try gripping and rubber band extensions. If gripping hurts, start out with very light, doesn't-even-feel-like-you're-training grip work, maybe wrist curls if it feels ok, as well as rubber band extensions (i mention these because they were the money exercise that got me back on track).

hope something in there helped you out a bit.

sorry man, dont think i saw that one. it was just a suggestion anyway