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    Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of, and finding treatments for, complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia, long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.

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muscle fatigue

  1. MartinK

    Why does even a hard lying mat tend to trigger PEM?

    Hey guys, I've been noticing a strange symptom for a while now - I'd like to know if anyone else has the same thing. And can anyone help me to think about how it might have to do with the muscles when I have not yet been diagnosed with any muscle disorder. The thing is that my muscles get tired...
  2. SWAlexander

    Muscle sodium content in patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome

    Abstract Background Muscle fatigue and pain are key symptoms of Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS). Although the pathophysiology is not yet fully understood, there is ample evidence for hypoperfusion which may result in electrolyte imbalance and sodium overload in...