that would be the sciatic nerve. take the weight off the belt and put it on your shoulders. shoulder holster, suspenders, pocket carry.
luck,
murf
p.s. i'm not a doctor
This! I have managed to avoid problems, but plugging “sciatica” into the search box, at any firearms-related forum, should produce plenty of results.
Sciatica is not the only nerve problem, that can arise from carrying guns and other heavy gear, but it is a significant issue.
I avoided problems by trying to keep things as near 0300 and 0900 as possible, with no weight or bulk behind my back, from 0330 to 0830. I also avoided letting my duty belt size increase, from age 22, until age 56, when I retired from LEO-ing. I stayed at 34 inches, that whole time. (Yes, I put on some weight, but little to none at belt level, though after retirement, I have, admittedly, acquired a bit of recent “pandemic belly.”)
I still believe in good, sturdy belts. Milt Sparks belts, built with a curve, are worth it. They last for decades, so are a good value, even if expensive at the time of purchase.