More than 80 percent of Americans have back pain at some point in their lives.

For some, the pain is caused by inflammation of the sacroiliac joint that attaches the sacrum (the lowest part of the spine) to the pelvis. Often this condition is missed or inappropriately treated.

The disease is called sacroiliitis, and in people under age 60 an underlying medical condition is often present. These include inflammatory bowel disease (ulcerative colitis and Crohn's disease), psoriasis ...

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