I have severe osteoporosis (I'm a guy, so that's really rare) and degenerative bone disease from Agent Orange in VietNam.
I also have three lumbar crushed vertebra, two damaged cervical vertebra, a fractured pelvis (non-resolvable), spinal stenosis and osteoarthritis, causing peripheral neuropathy.
All the above is non-operable.
I have been through the VA osteo clinic, studied the correct way to bear weight with a 5lb weight carrying limit, I can still play a 10lb bass
if I do it the right way.
I sit on a 35" high stool, no padding. I keep my bass at a position that although I can vary it a lot, it is more comfortable rather high. Not directly under my chin, and I certainly don't look like Steve Urkel, wearing a high water bass.
If I stand - (and standing isn't really an option after 3-5 minutes or so, as I can really feel the pain) it is only to adjust something and then sit on the stool again. Needless to say I don't dance, hop or move around too much - but that's OK with me.
Playing bass is not a contact sport. But now I can tell you of every place I got hurt when I was younger - football, car and airplane racing - OH - and motorcycles and two DOAs too!
If I knew I was gonna live this long, I'd have treated my body a little nicer when I was younger and
stu-u-upider
Wearing your bass like a gunslinger causes more than just back pain and your wrists will eat it badly if you persist. Kool doesn't always pay in the long run.
The highest propensity of sciatic problems are on the left side - and many people deny that's what it is (it can also be a kidney problem if it is just under the lower part of your ribs in the back quarter). Been there. Ignored it too long.
If you feel something like a burning vine twisting and running down your left leg - MAYBE you've got sciatic nerve damage and that is
usually from a damaged/compressed lumbar vertebra.
Needless to say if you are having any untoward reaction to your playing, you need to get to a specialist to see if/how you can resolve it.
All my symptoms are non-surgically repairable and if you think you can treat yourself badly and THEN get it all fixed later on, well -maybe not! Don't depend on doctors to fix what you are so nonchalantly destroying now.
BTW: Vicadin will not make you a better bass player - but you won't care.