1) A history of widespread pain lasting more than three month and
affecting all four quadrants of
the body, i.e., both sides, and
below the waist.
2) Tender points: There are 18 designated possible tender or trigger points (although a person with the disorder may feel pain in other areas as well). During diagnosis, four kilograms force is exerted at each of the 18 points; the patient must feel pain at 11 or more of these points for fibromyalgia to be considered.