Wrist tendonitis, or tenosynovitis, is a general term referring to any tendon in your wrist area causing wrist pain. The swelling of a wrist tendon sheath causes irritation to the tendon. This can be De Quervain’s syndrome, a repetitive strain injury (RSI), or it can even be the wrist flexor or wrist extensor tendons that are irritated.
These stretches and exercises should help.
Start off with active range of motion to the wrist to help relieve the wrist pain. These movements are wrist flexion and extension, radial and ulnar deviation, and pronation and supination. These movements are continuous to warm up the muscles.
Wrist stretching is also very helpful in relieving wrist pain. Stretching the wrist flexor and extensors are very important.
Then opening and closing the hand as widely as you comfortably can will help glide the wrist tendons to improve motion.
To strengthen the wrist, you can use a ball, towel, or pool noodle for finger flexion, and a rubber band for finger extension.
Finally, using a small weight can help reset the muscles in the wrist, and strengthening the wrist muscles will help reduce pain. Using a soup or vegetable can is a great treatment for wrist tendonits.