Multiple convos on this, which I will link
@Sasha, but it boils down to: some of us have a 'neurotoxic' reaction to corticoids.
Mine is the most severe I've ever heard of, but a poor reaction in general is not uncommon.
I've reacted to ACTH stimulation testing (which is meant to prod the patient into producing more of their own cortisol) and hydrocortisone (10mg) the same way. Neurotoxicity is a good summary of what happened.
I had marked increase in orthostasis (room was spinning even though I was lying flat), and though I was making sense in the ER in terms of language, when the doctor asked me to explain what had happened, I told all the events out of order -- and some were missing entirely. (They would pop back into my brain in random order over the next 24 hours.) I developed a rash at the injection point of the ACTH, which was used to say I must have been allergic to the 'carrier' or something. When the same happened with oral hydrocortisone, I had to rule that out.
Most worrying of all, I had a shock-like reaction. My blood oxygen dropped into the 70-s, I felt freezing cold, and I went white. Couldn't stop shaking.
I was recently chided by an ME doc who said patients behave as though their own symptoms always represent the ME population as a whole, so let me be super-clear. I did
a survey on PR in which 40% of patients replied that they, too, felt markedly worse after corticoids, being sure to title the thread in a neutral way to avoid attracting solely people who have bad reactions.* This is not a double-blinded trial or anything, but it is worrying.
Komaroff wrote about 'adverse events' in ME patients using corticoids, so it seems he has seen it often enough in clinic to be concerned. Shortly thereafter, I was at a conference where a research team found the same for about 30% of their research subjects with GWI and had started investigating the same in pwME. This is something that appears to be the case for about 1/3 of patients, until we learn better.
At least as far as my tiny survey went, 1/3 of people respond
positively to corticoids. So. We're all unique little snowflakes.
Finally, generally speaking, in the periphery, cortisol is anti-inflammatory.
In the CNS, it's
inflammatory.
https://www.ncbi.nlm.nih.gov/pubmed/12562515/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3691990/
If you already have CNS inflammation, more cortisol may be a poor treatment choice.
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*If you have EVER taken corticoids (glucocorticoids, prednisone, e.g.) -- whether you had a reaction, no reaction, or they helped out -- please click on the link to the survey and add your info if you have a username on PR. FOR SCIENCE.