have had pain in right back flank pain for 7 weeks. had CT scan, cystoscopy, ultrasound, urinalysis and culture, urodynamic study....all negative for kidney stones. did have bilateral cortesone injections into hips for throcantor bursitis one week before onset of right back flank pain. DX was lazy bladder and strain to right back flank muscle. the pain is unusual in that it does not hurt for long periods of time, then will suddenly be sharp and stabbing almost taking my breath away.