Probably Disc degenerative disease with spondylolisthesis of L5-S1

Disc problem is there Need medicine and rest

You have reduced disc spaces in upper dorsolumbar vertebrae...also lysthesis noted in l5 s1

From the X-ray provided, the lumbar spine alignment, vertebral heights, and disc spaces look largely preserved, with no obvious fracture, slip (spondylolisthesis), or major deformity, which is why your doctor called it normal. however, X-rays only show bones, not discs, nerves, or muscles, so many causes of lower back pain (muscle strain, ligament sprain, early disc irritation, or facet joint inflammation) will not appear on X-ray. Pain limited to the lower middle back without leg radiation usually suggests mechanical or muscular back pain, not a nerve compression or slip disc. Reduced walking speed often happens because of muscle spasm or stiffness, not structural damage. if pain persists beyond a few weeks, an MRI may help evaluate soft tissues, but most such cases improve with posture correction, heat, and gradual core strengthening rather than imaging alone.

Xray shows Spondylolisthesis L5-S1 Adviced : Physiotherapy Weight Reduction (if) Avoid heavy weight lifting