Tiredness or physical fatigue with no obvious cause is a very common complaint. It is normal to feel tired at times, e.g. after working long hours, unaccustomed exertion or sleepless nights. However, it is important to differentiate between tiredness due to excessive normal activities and tiredness due to disease.

Causes

Post-viral fatigue syndromes

Acute

  • Infectious mononucleosis

  • Viral hepatitis

Chronic

  • Chronic post-viral fatigue syndrome (CFS)

Endocrine

  • Hypothyroidism

  • Diabetes mellitus

  • Hyperthyroidism

  • Addison’s disease

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