I think it's been a combination of things Jazzy. I've been a climber since I was about 17, playing the Bass as long and working full time in IT since I was 23. I've also been into whitewater kayaking since 1990 and have always done my own DIY and car maintenance. Since I moved up to Scotland in 1998, I've been cycling in to work 3 days a week too so there's been alot of wear and tear on my hands. I first noticed a tingling during gigs about 18 months ago and around the same time I was finding my hands would go numb about halfway into work (it's a 9 mile trip). At the time I thought it was related to my handlebar padding and tried all sorts of cycling mitts with gel inserts. Obviously I was wrong and should have seen a doctor alot sooner that I did. A cautionary tale - if you notice any pins and needles see the doc straightaway!
Graeme