Sudden cramp-like pain in the lower back should be immediately rested in the lying position, do not stand, walk and carry out activities of the lower back to prevent the aggravation of the disease. At the same time, you should wear a lumbar brace for protection, and go to the hospital for examination immediately if possible. This condition is commonly caused by the following reasons: a. Acute injury to the lumbar region causes ligament, fascia, muscle laceration, and acute cramp-like pain, and braking rest can play a protective role. Second, due to the presence of osteoporosis, a sudden compression fracture of the lumbar region, resulting in acute cramp-like pain, should be braked and fixed and relevant examinations should be performed. In patients with lumbar disc herniation, the herniated nucleus pulposus falls into the spinal canal due to improper activity, producing acute compression of the nerve roots and cauda equina, and cramp-like pain may also occur.