RA is an inherited disease, so it's not really 'caused' by anything.
Do you think you might have been misdiagnosed? I've heard lots of medications can cause arthritis-like symptoms. I don't know about Cozaar - ask your pharmacist if it's a side effect. It would be great if you were misdiagnosed, you could just switch meds and be 'cured'!
:angel: Good luck . . .