Sudden lumbar pain is afraid to bend over, consider lumbar small joint disorder, lumbar sprain, lumbar spine fracture and other reasons. 1. Lumbar spine small joint disorder: sudden twisting of the lumbar region causes small joint dislocation and synovial membrane jamming, resulting in sudden lumbar pain, and the lumbar spine does not dare to straighten. Symptoms can be relieved immediately after orthopedic massage. 2. Lumbar sprain: after lumbar sprain, one side of the lumbar pain, lumbar spine activity is limited, fixed in a fixed position, need to recuperate for 2~3 weeks to recover. 3. Lumbar spine fracture: Lumbar spine fracture occurs due to trauma or osteoporosis, and there is sudden lumbar pain, not daring to bend down. The diagnosis can be clarified by taking CT of lumbar spine. Sudden lumbar pain, not dare to bend over the best to go to the hospital to check out the cause of the disease and further treatment.