What could the cause of mid back pain be?

Answer:
Mid back pain is not usual any you must seek your doctor

Answer

Two things I had backaches/pain from that weren't straining or actually doing something to my back were gallstones -it hurts mostly on the right side under your ribs front & back and I was pregnant and didn't know it with my second child and had gas that caused back pain up in the mid section I guess from bloating or something
First answer by ID1147291425. Last edit by Ali1378. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 42 [recommend question].