Cramp-like pain in the back: 1. Sciatica may be caused by cauda equina inflammation of the spinal cord, lumbar disc herniation, trauma, lumbar spondylitis, lumbar spinal stenosis, tuberculosis or tumor of the spine, etc. The pain is mainly along the sciatic nerve, with radiating pain in the lower back, buttocks, posterior and lateral calf and lateral foot. The actual pain of the lower back cramps, if not relieved within a short period of time, must go to a regular hospital to improve the lumbar spine MRI, clear diagnosis, and give symptomatic treatment. 2, the lower back cramp-like pain may also be caused by urinary system or ureteral stones, the symptoms are generally more intense, sometimes accompanied by other symptoms such as hematuria, so we must pay attention to identify.