Approach to Fatigue

Definitions of fatigue

Type Clinical features 
General definitions 
  • Subjective sense of weakness 
    • Difficulty or inability to start an activity 
  • Easy fatigability 
    • Difficulty with maintaining an activity 
  • Mental fatigue 
    • Difficult with concentration, memory, and emotional stability 
Duration of fatigue 
  • Acute 
    • Duration < 1 month  
  • Subacute 
    • Duration 1-6 months 
  • Chronic 
    • Duration > 6 months 
(Next Lesson) Common causes of fatigue
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