The left side of the waist a burst of stabbing pain, the following common causes: First, acute lumbar muscle sprain: when carrying heavy objects if not pay attention to protection, easily lead to acute sprain of the left side of the lumbar muscle, the patient will have congestion and edema of the lumbar muscle, so there will be a burst of stabbing pain clinical symptoms. At the same time, there will be local swelling, and the pain will be more serious when pressed, and the lumbar spine movement will be affected. Second, the left lumbar transverse process fracture: if the patient suddenly turns around in the process of strenuous exercise, the transverse process can be fractured, which can also lead to clinical symptoms of a burst of stabbing pain in the left side of the lumbar region, accompanied by lumbar spine activity restriction, and the X-ray film will reveal the lumbar spine fracture dislocation. Timely diagnosis and treatment can make the above clinical symptoms fully relieved in a short period of time, and patients should usually pay attention to protecting the lumbar spine and lumbar soft tissues.