Science today isn't the same as the science 2000 years ago was but some principles remain the same. The human knowledge constantly grows but with more knowledge there comes even more mysteries and unsolved questions, so science is always going forward.
Causes. The most common cause of a cervical herniated nucleus pulposus is gradual degeneration of the disc, attenuation (weakening) of the posterior annulus fibrosis, and subsequent protrusion of the nucleus pulposus into the spinal canal causing compression of the nerve root.
A herniated nucleus pulposus has the potential to irritate nerves, thereby causing pain, numbness or weakness in a limb. A person experiencing any of these symptoms should seek medical attention immediately. However, many people with herniated discs experience no symptoms.