Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS)
https://www.nhs.uk/conditions/chronic-fatigue-syndrome-cfs/
WebOverview. Myalgic encephalomyelitis, also called chronic fatigue syndrome or ME/CFS, is a long-term condition with a wide range of symptoms. The most common symptom is extreme tiredness. ME/CFS can affect anyone, including children. It's more common in women, and tends to develop between your mid-20s and mid-40s.
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