Reading about this brought the understanding that this one is more in parallel with the golfers than with the tennis players ... It's a sharp pain on top of the little bone on the inner side (that with a hanging arm touches the body) of the left elbow. It's activated by pressing this spot or moving that left hand towards the left shoulder, closing the armpit. I think it started some month ago when I was working out the thumb position much more than usual (20/30 minutes of a 2 hours session) ... mainly switching a lot and fast between first positions and thumb. To fight it I pedantically expanded the routine for stretching for the wrists an fingers I got from martial arts (at least that's what I think) like palms up/down and turning inside/outside , the goodye winker, shoulder stretches etc. and it got something better within two weeks but does not go away completely. It is not really hurtful, does not keep me from playing at all (it even does not hurt at all while I play). I' say i have a pretty much relaxed left hand, doing the "hitchhiker posture" and prefer to have the bass standing upright on it's own, not inclined into the body. So are there any remedies, suggestions how to cure one of my weak spots?