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.
Source. Ventral hernia may develop to a number of reasons. A lot of system disorders may contribute to give rise to herniation inside the abdomen. The common causes for hernia development include: 1  Weakening of Abdominal Walls. 2  When the walls of the abdominal cavity becomes weaker, it may lead to the development of hernia. 3  Infected Surgical Wound. 4  A ventral hernia may also occur if a surgical wound in the body of a person gets infected after operation. 5  Hematoma.