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What PEM Really Is (It’s Not Just Fatigue)
Dec 15, 2025
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If you have MECFS, you've probably heard of PEM — post-exertional malaise. PEM is the hallmark feature of ME/CFS, and one of the clearest ways clinicians distinguish it from other illnesses. PEM, as it is defined in ME/CFS, does not occur in other conditions in the same way.
However, the term post-...