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What Is Chronic Fatigue Syndrome?
Chronic fatigue syndrome goes undiagnosed in an estimated 80 percent of Americans living with the illness. Learn about the symptoms of CFS.
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What Causes Chronic Fatigue Syndrome?
Although no definitive cause has been found for chronic fatigue syndrome, many experts believe that it may develop from a convergence of two or more factors.
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Diagnosing Chronic Fatigue Syndrome
Because the symptoms of chronic fatigue syndrome closely resemble several other illnesses, it is important that doctors run tests to rule them out. Find out about conditions similar to or that may occur with CFS.







