Other conditions with symptoms similar to chronic fatigue syndrome

Fatigue can be a symptom of hundreds of medical conditions. All other possible causes of fatigue will be ruled out before chronic fatigue syndrome (CFS) is diagnosed. Exams and tests are used to rule out the most likely causes of fatigue, depending on the person's medical history and symptoms.

Chronic, persistent fatigue may be a symptom of various conditions, including:

Other possible causes of fatigue include:

  • Stress.
  • Medication side effects, or medications changed or added too quickly.
  • Alcohol or drug abuse.
  • Too little exercise or excessive exercise (overtraining).

Last Updated: April 28, 2009

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