Susan, try clicking on the link I posted up at the top. There's a lot of good information, even if the wording is a bit hypersyllabic. (Is that a word?) Tendinitis in the wrist can lead to carpal tunnel syndrome if it goes untreated and continues/recurs over a period of time. It's like the difference between a sunburn and skin cancer.

The "carpal tunnel" is a passage of bone through which the tendons in the wrist (and the median nerve) pass. If it becomes smaller (because of inflamation, arthritis, whatever) it can cause carpal tunnel syndrome, smptoms of which normally occur in the hands (because of nerve damage) - not the wrist.