The difference between a lumbar protrusion compressing the dural sac and a nerve root is a difference in symptoms, severity, and treatment. The nerve root is inside the dural sac as follows: 1. Compression of the dural sac: the dural sac is a sealed sac cavity formed by the tough connective tissue of the dura mater that wraps around the spinal cord. It plays a role in protecting the spinal cord. When the dural sac is compressed alone, there is cerebrospinal fluid between the dural sac and the spinal cord nerves, so it will not produce any clinical signs and symptoms, compared with the compression of the nerve root, the symptoms are less severe, and generally only need to carry out functional exercises, sleep on a hard board bed and other conservative treatments. 2. Compression of nerve root: lumbar intervertebral disc herniation will lead to lumbar nerve root extrusion and irritation, and there will be lumbar pain, radiating pain and numbness in the lower limbs, and the clinical symptoms are more serious. Generally, physical therapy and hot compresses, anti-inflammatory and analgesic drugs such as celecoxib and sodium rosoprofen, etc., and nutritive nerve drugs such as methylcobalamin and vitamin B, etc. should be taken. If conservative treatment is not effective, minimally invasive surgery such as laminectomy should be performed. If the dural sac compression is serious, it can also lead to nerve and spinal cord compression. It is recommended that the presence of nerve compression should be clarified in a timely manner, and appropriate examinations should be carried out under the guidance of the doctor.