Sudden lumbar pain that cannot be exerted is commonly associated with spinal fractures, acute lumbar sprains, pathological fractures of the spine, etc. The common feature is that the pain is severe, persistent, aggravated by activity, and the pain site is clearly localized. Acute lumbar sprain is mostly caused by sudden and violent twisting of the waist or lifting heavy objects sprained, immediately severe pain, afraid to move, general painkillers have no obvious effect, rarely radiating to the lower limbs. Spinal fractures all have a clear history of trauma, and severe pain in the lumbar region occurs immediately after the injury, sometimes with posterior convexity deformity, or with paraplegia, and X-rays show wedge-shaped changes of vertebral compression fractures. Pathological fractures of the spine are mostly vertebral metastases with no history of trauma, persistent pain, more pronounced at night, and lower extremity dysfunction followed by paraplegia, with radiographs showing destruction of a single vertebral body with normal intervertebral space, sometimes with detection of the primary tumor.