Ive had wrist issues from duck diving; over gripping the blockier rails on boards that were a bit to big to dip. Continually jamming with the heals of the hands can cause nerve pinching in the wrists; bring your pinky and thumb together, squeeze them together..is there strength? Have someone try to pull them apart while you squeeze together; they can judge if there is strength, one hand to the next. A good chiropractor can adjust your wrist if there is a problem. Shortly after there is a markable in crease in strength. Bracing them after treatment is essential...perhaps before surfing, it involves the same pincky thumb squeeze at which time you wrap self sticky foam tape (not adhesive type) its a 3M medical tape. Wrap the tape starting from the low wrists working up toward the heal of the hand like a funnel. while always squeezing the pinky/thumb together.
If your hand position during your stroke is sloppy and you let it flop back or can not hold it poised both entering and exiting the water work on it; unless your tendonitis is to severe. Hold your hand like a slightly cupped foil as you enter the water like a karate chop only with a 35 degree plus angle out or "reverve chop" index finger and thumb first same angle + or minus , the latter is preferred swimming stroke. Alternate which hurts more? the final pull and exit can kill also if you twist the wrist to far out or in or let it go passive and muscle the hand thru with out that foiled poise which tends to spit water. If the severity of your condition
entails, curtail the exit stroke and go into the recovery stroke with a high eblow hand extraction, dont even let you hand approach your leg as typical. Ultimately, the variations allow a little more pain mileage hopefully.
The rehab... worse case ....a cortizone shot in the tenden once or twice in a year, NO MORE. Again after this bracing and 4-6 weeks INACTIVITY, period. Thats after all else fails. There's stretches...basic bend the fingers back toward the elbow actively with the other hand or passively by putting the hand at your side and pointing the fingers back and try to touch the heal of you hand against a surface, a chair or floor if sitting.
Theres surgical tube stretches. make a loop, around your foot and hand. do forward wrist curls then back curls, then side rotation curls, all the while your isolating the wrists. doo this intermitently with the stretches.
After 3 sets, Ice it. Water, Ibuprofen, water, Sam-E, water. Water, Nano Greens, Water, Collodial minerals (liguid form), water.
The type of of work you do can contribute, as simple as mousing and typing in an non ergonomic postion...RIS common in office workers. Or High vibration or impact, work with air nailers, ratches, wrenches or jack hammers. The thing is even if you dont do the heavy work all the time, all you need is one 2min to -3 hour session to peel it and constant activity like surfing/ swimming to prevent recovery, and continually aggravate it. You have to stick with the rehab program...when it gets better ...dont discontinue, especially the bracing and streching.
I've had tennis and golfers eblow in both arms as well as the wrist and neck impingment issues. Missed plenty of epic surf, but even more when I dropped the routine cuz I though I was all healed up.