The disease Fibromyalgia is also
called Fibromyalgia Syndrome (FMS) - a neuroendocrine disorder with chronic deep muscle and soft-tissue pain and considerable fatigue. Fibromyalgia is often experienced by those with CFS. The American College of Rheumatology criteria for fibromyalgia include widespread pain in all four quadrants of the body, persisting at least three months, and sensitivity to pressure in the majority of a number of "tender points" found on the neck, shoulder, chest, hip, knee and elbow.
Fibromyalgia is often confused with chronic Myofascial Pain Syndrome (MPS), a neuromuscular disorder with achiness in specific areas rather than body-wide as in FMS. It is easier to treat with massage, stretching, and exercise, and is more likely to be helped by trigger point injections.