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3.According to some experienced researchers, the chief characteristics of CFS are:

  • symptoms of marked and prolonged fatigue;

  • fatigue which is of new onset;

  • symptoms lasting more than six months;

  • up to a 50% reduction in activity.

The cardinal feature of CFS is unexplained chronic fatigue that may be constant or relapsing.


4.Research has indicated that there is widespread agreement within the medical profession that there is no specific diagnostic test for CFS and that it does not represent a specific disease.  The cause of the condition is unknown and there is much disagreement about what it constitutes.