Fibromyalgia - Defined
Fibromyalgia is a complex syndrome characterized by pain amplification, musculoskeletal discomfort, and multiple systemic symptoms. In order to meet the criteria established by the American College of Rheumatology, the pain must have been present for at least 3 months' duration, and must be present in all 4 quadrants of the body. The pain must occur in certain specific anatomical sites and there have been 18 such sites identified. In the past, it was felt that at least 11 of these sites must produce severe pain when 8 pounds of pressure were applied in order for the diagnosis of fibromyalgia to be established. Recently, many researchers and clinicians have felt that even if less than 11 sites were active at the time of the exam, if other criteria were met, the diagnosis of fibromyalgia could still be made.

The reference above to "multiple systemic symptoms" means that symptoms occur in such systems of the body as musculoskeletal, cardiovascular, genitourinary, nervous, lymphatic, immune, and respiratory systems.
The Four Quadrants
18 Pain Sites
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