+1! I had a very similar experience.

Quote Originally Posted by Kathi View Post
Short and bra cup size has nothing to do with back pain. Your cup does not support your boobs the support comes from the band. I too was having back pain, thought it was because I wasn't lifting upper body weights. Turns out my bra band was too big, and the cups too small. I went from a 30D to a 28FF and I'm 5'1". It took some used to a tighter band but the back pain went away.