I have pain on my left back on hip. The scanning report of kidney, bladder r normal, dr said it is uti, but the urine culture s neg what is the reason?

Negative C;S= no UTI. Ur correct in questioning diagnosis of UTI in absence of positive urine culture. Ur symptoms are likely musculo-skeletal. Did dr check ur spine, sacroiliac joints ; hips by inspection ; palpation? You might need conventional x-rays of lumbar-sacral spine ; pelvis. Dr probably suspected because u had a UTI 6 months ago. Might consider seeing rheumatologist or orthopedist. Good luck.