[quote name='liamcapleton' post='507945' date='Jun 8 2009, 08:35 AM']Is it muscle pain, or pain caused by the friction between your fingers and your strings?
If it's the former, then I guess it might be worth assessing your hand positioning and also warming up before playing long gigs. If it's really bad I'd say go and see a doctor.[/quote]
I don't think it's a friction problem as the pain is not on the surface but as if the soft tissue inside had been damaged i.e. as if you'd hit your finger with a hammer (only obviously not as painful). Don't know why it would strike now though as I've played guitars and basses for many years and have not been playing excessively recently. I'm not aware of applying excessive finger pressure - certainly not to the extent of causing physical damage.