Physician here. Imo CFS is best understood as the endpoint of an evolution within the nervous system that is increasingly called "central sensitization syndrome." (CSS) This syndrome is caused by a chronic dissociative or avoidant stress response, usually having it's origin in early childhood adversity. Prior to developing CFS, most individuals have other manifestations of CSS, such as IBS, chronic pain, TMD, etc. Ev…
How does this theory line up with the my experience, which seems to be similar to a lot of people with CFS: I had high energy levels until I suddenly got sick, and had a mild fever for about a day. After that I had the sort of fatigue one feels when having the flu, except it lasted for about 8 months, and then gradually lifted. After that my energy levels totally recovered and stayed normal for over a decade. All tes…
The person who told me this had a patient who lost her sense of smell after Covid, and it wouldn't come back. It came back after a single session in the sauna.