Rheumatoid Arthritis Support Group
Rheumatoid arthritis is a chronic, inflammatory, multisystem, autoimmune disorder. It is a disabling and painful condition which can lead to substantial loss of mobility due to pain and joint destruction. The disease is also systemic in that it often also affects many extra-articular tissues throughout the body including the skin, blood vessels, heart, lungs, and...
I had lost my sense of taste a while ago and they found I was deficient in zinc. I think it could also affect your sense of smell.
When I had all 4 wisdom teeth removed this summer, one was very close to a nerve in my lower jaw. During the recovery process, I had severe inflammation in my TMJ (possibly also due to RA?), and the most noticeable symptom was a complete loss of taste. I recall eating a spoonful of raw sugar just to see if it was all in my mind...nope, no sense of taste at all. I was terrified that I'd be stuck like that; it's very tough to eat when nothing has taste.
However, once the swelling went away, my taste came back. I could hypothesize that your RA is affecting your TMJ and potentially pressing on a nerve that's related to taste, as the case was with me.