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How long has this been going on? Have you ever injured the wrist? This sounds like a mechanical problem involving the bones and ligaments of the wrist. I would suggest you get a CT scan to rule out an occult fracture or other bony lesion. This study will also give you some idea as to the alignment of the bones. An alternative would be an MRI which shows the bones fairly well but also provides some information about the soft tissues such as the muscles, tendons, ligaments and nerves.
You're welcome. In the meantime, I would suggest you wear a firm wrist splint to reduce excess movement at the wrist and excess energy going into whatever structure is causing your pain. Try taking an anti-inflammatory such as advil or alleve if you tolerate them. It will help not only with pain but also any inflammation that is present.
Glad to be of help. Let me know if you have any further questions.