For anyone who has done FMT, did you have worsening symptoms in the few days after? Outcomes 

Prodigyev

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Nov 29, 2025
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I did my fist FMT a few days ago. I think I’m experience more brain fog today…is this a bad sign? Maybe my biome is shifting a bit? Maybe I’m coping?
 
In my experience, some donors can trigger an initial day-or-so of worsening symptoms before seeing subsequent improvements. With bad donors, they can worsen symptoms and cause new ones, and the symptoms don't go away.

It can be difficult to immediately determine which is which. Adequate learning & donor selection beforehand are key.

More info: https://www.humanmicrobes.org/fmt-clinician-guidance
 
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