Sixteen gigs/jams/run throughs between Thanksgivings and New Year's Weekend, playing EGB and EUB/Upright, and my left thumb is sore at the base joint. Didn't think too much of it when it started aching last weekend, took some NASID's and it all worked out fine. Has been annoying all week and I down Ibuprofen with breakfast and dinner regularly. Did a showcase thing last night and could hardly think of anything else. It almost feels like arthritis. Anybody ever hear of this...something in my hand positioning (firmly behind the neck) or am I just worn out?