My mum had rheumatoid arthritis, she was one of the few for whom nothing could be done and became totally dependant on me in the end.
Naturally I worry about it too, I have arthritis in various places, nothing yet to indicate it is the rheumatoid variety, though it is a while since I had an ESR test.
I expect when I see my orthopedic surgeon on Monday he will diagnose arthritis in my shoulder, it is certainly giving me trouble at the moment.
I seem to have the same pattern of stiffness in the mornings that my mother had, which worries me somewhat, but I would still rather have RA than ALS.
I take anti inflammatories at the moment.