Would pain under the right breast be from my kidney? ultrasound stated the gallbladder looked normal. the pain comes and goes an some lower back pain.

Bra may not fit: An ill-fitting bra is a common cause of pain under the breast, particularly if the bra is too tight and there is a wire support in the lower edge. The wire puts pressure on the inframammary ridge (the prominent transition from your stomach wall and lower breast). Over time this becomes very tender. If possible, have your bra fit to you at purchase. The slight extra cost is worth every penny.