A completely uneducated guess Cort - some kind of neuropathy from damaged nerves - I do recall one Doc in ER speaking about myelin sheath damage (he suspected).
Hi, Enid.
I think you might be on the right track in suggesting damage to myelin in ME/CFS. Probably the best documented brain-related observation in ME/CFS is slow processing speed. Since myelin is what allows nerve impulses to travel rapidly down axons, damage to myelin could likely explain the observed slow processing speed.
I think there is also a good basis to suspect myelin disrepair from the standpoint of the biochemistry of ME/CFS. We have good evidence for a methylation deficit in ME/CFS, and it is also known that at least three components of myelin require methylation for their synthesis: myelin basic protein, phosphatidylcholine, and choline plasmalogen.
Beyond this, it has been reported for many years that MRI images of the brains of people with ME/CFS show "white spots" in the white matter. The white matter is dominated by myelin, and this suggests damage to myelin.
I have also suggested that the sensitivity to electromagnetic radiation that some people with ME/CFS experience is due to disrepair of myelin, which removes the electrical insulation from the nerve axons and allows currents to be generated in the axons, producing neurological symptoms.
I think that all of this is consistent and is pointing to problems with the myelin in ME/CFS.
Best regards,
Rich