I was searching around for an official definition of RA and came across the word 'progressive' a few times. This was on reputable websites, too. It didn't state that RA *is* progression, just that it *can* be.
I'm not sure how I feel about this word, it's quite sinister sounding. At a push, I suppose I would say my RA is progressive, although it's not a description I would choose to use.
I'd be interested in other people's thoughts.