Hip
Senior Member
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in my experience PEM and post-viral fatigue are very different
I don't these can really be equivalent, as PVF is an illness or medical condition, as is ME/CFS, whereas PEM is a symptom of both these conditions.
PVF as a medical term is ambiguous, as it is sometimes used as a synonym for ME/CFS, and other times it is used to refer to the post-viral infection fatiguing condition that people may experience after infections such as mono. I am using the term PVF in the latter meaning.
Here is some info on PVF: https://www.healthline.com/health/post-viral-fatigue