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Fatigue (either physical, mental or both) is a symptom that may be
difficult for the patient to describe and words like lethargic, exhausted and
tired may be used.
Taking a careful and complete history is the key to help making the
underlying diagnosis of the cause for the symptom of fatigue. However, in about
a third of patients the cause is not found and the diagnosis is not known.
There are numerous causes of fatigue symptoms. Examples of some treatable causes of
fatigue include anemia, diabetes,
thyroid disease, heart disease, COPD and sleep
Long lasting complaints of fatigue do not equate to chronic fatigue
syndrome. Specific criteria as set by the CDC need to be met to make that