I've had PMR since March 2019, managed with Prednisone and Leflunamide. After a slow taper to 3.mg, my hands started swelling last August and were so stiff and painful that I could hardly use them. As I have mild carpal tunnel syndrome, I contacted my hand surgeon at Kingston hospital and got an appointment in November. He took one look and said: that's inflammation, not CTS. He suggested it was a PMR flare, and I had 3 weeks on 9mg prednisone (which worked well) before a slow taper again.
I had my regular 6-month follow-up with my rheumatologist last week. She said it was more likely to be yet another inflammatory condition: Rheumatoid Arthritis. I've had lots of osteoarthritis (shoulder decompressions, 2 knee replacements, spinal decompression....) but this is a new one for me. Her suggestion was to keep a VERY slow taper, and if it happened again to contact her and they would double my leflunomide to 20mg, keeping the pred. at the same dose.
My normal-sized fingers are crossed that I don't have that again, it is most upsetting and unpleasant.