Yes, I have had really bad back pain, since after my surgery (when I started loosing)till now and I'm about 5 1/2 months out and close to goal with a normal BMI. I though by now it would have gotten better but it hasn't (it's so bad sometimes its like an an abcessed tooth type of pain)Someone mentioned it could have something to do with our bodies adjusting and especially our stomaches, where before they stuck out and now their is loose skin, and it pulls on our backs and shoulders more. Just a thought! I'm hoping maybe a tummy tuck will help mine. If not, I'm kinda at a loss.