Chronic fatigue syndrome, or CFS, is a complex and debilitating
disorder characterized by profound fatigue that is not improved
with sleep or bed rest and that gets worse with physical or
mental activity. There is no known lab test to help
diagnosis chronic fatigue syndrome. To receive a diagnosis
of CFS, a person must satisfy the two following criteria.
First, a patient must have severe chronic fatigue for six
months or longer. The fatigue can not be part of another
known medical condition.
Second, a patient must concurrently have four or more
of the following symptoms: