google Health Back Pain - Nonspecific back pain refers to pain in the back due to an unknown cause.
Yahoo Health Back Pain - A herniated disc usually is caused by wear and tear of the disc. As we age, our vertebral discs lose some of the fluid that helps them maintain flexibility.
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MSN Health Back Pain - How to Prevent Back Pain at Work
Wikipedia Back Pain - Back pain (also known "dorsalgia") is pain felt in the back that usually originates from the muscles, nerves, bones, joints or other structures in the spine.