New to electric bass, finally got my first last week. Yesterday after doing some left hand drills and a few scales I switched over to playing lines out of one of my fake books. Messing with 5/7 chord transitions, etc. I don't remember how long I played but it wasn't short. This morning at work sitting at the keyboard I noticed a very irritating ache in my left hand, in that meaty region between the thumb and first finger, towards the joint. It doesn't help that I pinched a nerve in my shoulder a few months ago which causes me to often have pins and needles in my thumb and first 2 fingers. This is just part of getting used to fretting on a bass or am I possibly doing something wrong? Oh also forgot to add that I'm double jointed and I doalso play ukulele. I took tonight off, did a few left hand drills and just watched a few videos about other drills, pentatonics, etc. Did a check on my new POS bass and noticed the frets are entirely level all the way down the neck but the very last one and the string height is 2-2.5mm at the 12th fret or so (I guess a tad high, but not grossly so.) Looks like a shielding job will make it pretty sweet.