Not that I know of, doc found nothing. She pushed around on my back and nothing hurt. She didn't say anything was asymmetrical.

I have less tightness in the back these days than I ever had, since I did yoga in my late 20s - never had lower back pain in 10+ years, sometimes the iliosacral joint locks but unlocks again.

I believe I have rather strong back muscles (love those backbends). There's a very likely imbalance.