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Herniated Disc
Herniation of the nucleus pulposus (HNP) occurs when the nucleus (gel-like substance) breaks through the annulus fibrosis (tire-like structure) of an intervertebral disc (spinal shock absorber). Herniated disc symptoms include pain, numbness, tingling or loss of muscle strength. Disc injuries in the neck region may affect the arms or hands while disc injuries in the low back may affect the legs or feet. People between the ages of 30 and 50 appear to be vulnerable because the elasticity of the disc and water content of the nucleus decreases with age.
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