NOT ALL BACK PAIN IS DUE TO BONE AND SOFT TISSUE PROBLEMS!
UPPER BACK
Heart problem
Pulmonary problems
Large vessel disease
Rib problems
MIDDLE BACK
Pancreatic problem
Intestinal problems
Gall stone
Renal stone
LOWER BACK
Uretric stone
Pelvic organ problems- uterus, bladder, rectum
Rarely it might also be due to metastasis.
Do visit a doctor before you conclude !