The magnitude and duration of one’s fatigue, and the degree to which fatigue impairs daily activities will help distinguish CFS from ordinary fatigue. According to the criteria set by the Institute of Medicine (IOM) in 2015, one’s fatigue must feel profound, last for more than six months, and significantly reduce one’s ability to engage in daily activities compared to before symptoms began. Additionally, symptoms like extreme fatigue following exercise and the inability to get restful sleep are more characteristic of CFS than regular fatigue.
How do I know if I have CFS or am just fatigued?
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•Last Updated: May 16, 2025
To distinguish chronic fatigue syndrome rather than ordinary fatigue, consider the severity and duration of fatigue, which should be profound, last over 6 months, and significantly impair daily activities. Symptoms such as extreme fatigue after exercise and poor sleep quality are also indicative of chronic fatigue syndrome.