Tendonitis can occur at the wrist of your feathering hand. It causes swelling and pain and sometimes you can even hear a noise as you flex your wrist. It is more frequent when we paddle in windy conditions.
I have found it can be prevented by strapping the wrist and I now use two small neoprene/velcro wrist supports and have never had any problem. The strapping or support should only be loosely applied.
You can also use a light elastic bandage or a cohesive bandage that I mention in the Post on blister prevention.
If you use a cohesive bandage, apply it lightly to allow for some natural swelling of the wrist to occur during paddling.