I have got tendonitis in my wrist. I need advice on how to treat it! My bones crack in my wrist. Do I need a cast if the pain gets too bad? Need help!

See details. The wrist needs to be evaluated. Casting is only very rarely needed. Splinting is easier. However, many areas of tendinitis can resolve with a simple cortisone injection. See a rheumatologist or orthopedist.