What is Chronic Fatigue Syndrome?

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From Pamela Rice Hahn,

Chronic Fatigue Syndrome (CFS), which is also sometimes referred to as Chronic Fatigue Immune Dysfunction Syndrome (CFIDS) or Myalgic Encephalomyelitis (M.E.), is a condition characterized by the primary symptom of a prolonged, persistent debilitating fatigue not relieved by rest and not directly caused by other conditions. In general, a diagnosis for CFS requires that the tiredness is severe enough for at least a 50% decrease in the patient’s ability to participate in ordinary activities. The Centers for Disease Control (CDC) describes CFS as a distinct disorder with specific symptoms and physical signs, based on the exclusion of other possible causes.

to read on...http://chronicfatigue.about.com/od/articles/a/cfs1.htm