Sudden stabbing pain in the waist when bending over is considered to be caused by lumbar dorsal fasciitis, lumbar intervertebral disc herniation, osteophytes and other factors. 1. Lumbar dorsal fasciitis: the etiology is not clear, mostly related to climatic factors, trauma, chronic strain and other factors, the clinical manifestations of the lumbar back diffuse soreness, tingling, and may have a sense of pressure and pain, when the patient’s activities are excessive (such as bending over and so on), can be triggered by the pain. 2. Lumbar disc herniation: Lumbar disc herniation will cause the nucleus pulposus and intervertebral disc to protrude to the back or in the spinal canal, thus compressing the peripheral nerves and causing tingling sensation when the patient bends down. 3. Osteomalacia: It is a bony growth on the edge of the normal bone. Lumbar osteophytes can make the intervertebral foramen smaller and narrower, thus compressing the vertebral artery and leading to tingling sensation when the patient bends over. In addition, there are many other reasons that can cause sudden stabbing pain in the waist when bending over, and it is recommended that patients go to the hospital in time to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.