herniated disc

With age, the center of vertebral discs may start to lose water content, making the disc less effective as a cushion, causing displacement of the disc?s center (herniated or ruptured disc) through a crack in the outer layer. Most disc herniations occur in the bottom two discs of the lumbar spine, at and just below the waist. A herniated disc can press on a nerve root in the spine and may cause back pain or pain, numbness, tingling or weakness of the leg called ?sciatica.? Also known as a slipped or ruptured disc, or herniated nucleus pulposus (HNP). Can also occur in the neck and rarely in the thoracic portion of the spine.

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