31 of 364 ME/CFS patients tested positive for at least 1 of 4 autoantibodies in
this study for small-fiber polyneuropathy.
Those 31 patients have pretty much identified the cause of their fatigue.
So you think, "well that's less than 10%, so I'm not likely part of that group". Wrong.
You might not have those specific auto-antibodies, but the majority of those w/ ME/CFS have auto-antibodies to something important. Something that probably causes the symptoms you have.
-------EDIT--------
I wanted to come back and edit this. I want to make this very clear. I am 100% confident in the idea, but I don't want it to be misconstrued.
I am
not saying that auto-antibodies and autoimmunity are the sole cause of symptoms. What I am saying, is that the majority of those w/ "ME/CFS" have autoimmune genetic predispositions, and that auto-antibodies and autoimmunity plays a significant role in the development, perpetuation, and exacerbation of the persons unique set of conditions.
While auto-antibody treatment can potentially relieve symptoms, it's important to remember a single treatment isn't likely to cure symptoms elicited by a complex multi-faceted set of conditions.
-------EDIT--------
The small-fiber polyneuropathy study looked at (4) autoantibodies, two cholinergic and two adrenergic receptors. But in this
specific category of receptors they are looking at, there are
twice as many that could cause symptoms of CFS.
Maybe 10% of us have autoantibodies to the 4 they were looking at. Maybe 10% more of us have autoantibodies to the others.
But that's nothing. There are dozens of other auto-antibodies that can mistakenly attack your own body that could cause fatigue, pain, PEM, autonomic dysfunction, etc.
There are conflicting studies on viral (and non-viral) infections in ME/CFS. But when they do auto-antibody studies in ME/CFS, they often come up w/ definitive evidence.
Antinuclear antibodies (ANA), ganglionic receptor (alpha 3) antibodies, TPO antibodies for Hashimoto's, TRab antibodies for Graves disease, all the antiphospholipid antibodies, serotonin antibodies (5-HT), Heat shock protein antibodies, NMDA receptor antibodies, Anti-IgLON5 antibodies.
Guys, I'm telling you right now. Any one of these can cause the fatigue, pain, GI dysmotility, or dysautonomia symptoms you're feeling. And there are way more than the ones I just mentioned that can cause your symptoms. That, AND, they are still finding new auto-antibodies. There are still antibodies attacking important parts of the human body that haven't been discovered.
If you put all this together, all the auto-antibody studies and what-not, you'll see that autoimmunity in ME/CFS is close to 90%.