Traction is useful for herniated discs, but not for any type of disc herniation. Once a cervical disc herniation occurs, it can manifest itself in several ways, most commonly as pain in the nerve roots, pain radiating down the neck and shoulder into the arms, or in another part of the patient with walking problems in both lower extremities, such as spinal cord injury symptoms. The intervertebral disc includes the endplates of the cartilage above and below the vertebral body, the fibrous ring and the nucleus pulposus. If the fibrous ring is not ruptured, the nucleus pulposus within the fibrous ring is retracted through the pulling of the posterior longitudinal ligament, which reduces the compression of the herniated disc on the nerve roots and dura, thus changing and improving the symptoms. So traction is useful for which cervical disc herniation? 1, for the former, traction is useful. 2.For the nerve root type causing arm pain, stretching the neck and stabilizing the cervical spine will reduce the irritation of bone spurs and discs on nerve roots, which is effective for reducing the symptoms of nerve root disease, and traction is useful at this time. 3, for spinal cord type cervical spondylosis, take a cautious attitude towards traction and massage, because the harm caused by spinal cord injury is often greater, then do traction, trying to shrink the disc back through the contraction of ligaments, which is less likely. The risks faced by the treatment are often relatively large, and it is not highly recommended that patients do this treatment.