problems in the back/spine (nerve pain) shingles (even without skin lesions) kidney issues/kidney stone (a cystoscopy does not rule out this) spleen pancreatic problems muscle strain intestinal gas problems in the small intestine (the colonoscopy does not view this area left lower lobe lung issues. there are many diagnostic stones to overturn. perhaps the next test would be an abdominal ct scan or mri.
left flank pain but colonoscopy and cystoscopy found nothing. what could be causing the pain? . .