Maybe, but before you jump to that conclusion, I would ask if you keep your wallet in your back right pocket.
Nope, never have, front left pocket since at the 1970s, in part due to fear of pickpockets, and in part due to something mentioned on the PBS T.V. show "Maggie and the Beautiful Machine", where she talked about the same you're thinking of. It is possible that I slept on it funny, but that's just part of POOMS.
I had this for years starting about 10 years ago - before I considered myself to be old, so yes, prematurely.
It has quietly gone away as I have been strengthening my lower back and been using a tush cush for sitting incl. driving.
It cleared up over the past few days, no remaining sign of it. For now, anyway.