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Owing to the broad differential diagnoses that can present as fatigue, a rational approach to diagnosis is paramount. Performance of a battery of diagnostic tests is unlikely to assist with diagnosis, highlighting the importance of a thorough history and physical examination. Fatigue can be a sequela of an underlying medical disease or exists as a primary condition. Management of secondary fatigue largely depends on treatment of the underlying condition. There are no FDA-approved medications for primary fatigue, now known as system exertion intolerance disease. Treatment is focused on individualized exercise therapy and cognitive behavioral therapy.
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