Yes, I did, in addition to my walking disability. See my post regarding walking. The back was horrible for the first two years, and has improved significantly now that I am taking the NK. I had back issues before the COVID booster but nothing like what followed. Had to lie down for hours a day using a heating pad. Still do for an hour or two, but acknowledge that I am 80 years old, but all of this has aged me. Was always healthy and played tennis until well into my 70s. Now this!