Well, you won't be surprised to know I don't want to see a GP at the mo, but I am keen to know what this is.
I'm 59 and for the last year or so my left thumb has ached on and off...it's a dull ache, occasionally more and when I massage it there are definitely "grainy" bits. It was definitely exacerbated by how I held my mobile in that hand when texting. When I asked the GP casually about it after it had started he said it was probably early stages arthritis, which he saw as very similar to RSI.
What do you think? And what is likely to help? I'm up for doing anything - eating strange things, etc!