Chronic Fatigue Syndrome (CFIDS) is a complex disorder, characterized by incapacitating fatigue, flu-like symptoms, neuropsychological problems and immunological abnormalities. Up to 80% of patients also suffer with a condition known as fibromyalgia which causes severe musculoskeletal aches and pains.  Many factors are involved with CFIDS, but most experts feel that it is triggered by a viral infection.