Welcome to the mighty Talkbass.
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TB user
Chris K is compiling
some info re: bass playing, health and ergonomics. It's worth a read through there.
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I'm 40, I've have been playing since I was 13, and my left thumb is pretty much shot.
I can't tune my bass with my left hand anymore, I can't close a ziplock bag, I can't open a bag of chips, I can't use my thumb & forefinger to button my jeans or pull up my socks, I can't hold a coffee mug, I keep dropping stuff with my left hand... you get the picture. My left thumb is EFFED.
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I've got tendinitis, not CTS.
Doctor says the only cure is to stop playing for 6 months to a year.
Ibuprofen and
warming up before playing helps, and
icepacks after playing helps, but yeah... my days are numbered.
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I had the same issue with my right hand (no thumb strength) for about a year. I went berzerk one winter cutting up a bunch of firewood with my right hand, and I totally screwed up my shoulder and thumb. Exacy same symptoms that I currently have with my left hand. I had to stop using my right thumb for almost a year straight before I got any strength back.
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If you look at your left palm, your thumb and 1st finger make a "J" or backwards "L." My understanding is that there are tendons that run along "pulleys" in your bones, and when you get this condition, the tendons are hopping out of their pulleys and trying to "cut the corner." I can feel my thumb "pop out" if I exert it too much. Pretty painful, so I avoid exertion.
I guess cops and competitive gun shooters are prone to the same "thumb pulley" issue since they're stressing their thumbs with gunfire.
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1) Listen to your doctor. I am not a doctor. I've gone to three doctors, and they've all said short of surgery, the only solution is to stop playing guitar for a year. Great. Not currently an option for me.
2) Maybe part of the problem is that your bass necks are TOO small. I've played some bigger necks that are more comfortable. And some super-small necks that were excruciating after 20 minutes of rehearsal.
3) Listen to your doctor.
Good luck.