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Fibromyalgia

Compared within 2 studies that had both: 94 people with fibromyalgia and 101 healthy people. 3 microbes are less common in people with fibromyalgia, and 6 more common.

A difference is an association: it doesn’t mean these microbes cause, prevent or treat fibromyalgia.

Phylum

Searching opens both lists and shows only matching rows.

Less common in fibromyalgia · 3

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Clostridium sp. AF12-28 in 2 studies Healthy 30% fibromyalgia 9.6%
  2. Sutterella wadsworthensis in 2 studies Healthy 55% fibromyalgia 32%
  3. Clostridium lentum in 2 studies Healthy 15% fibromyalgia 3.2%

More common in fibromyalgia · 6

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Lawsonibacter faecis in 2 studies Healthy 5.2% fibromyalgia 21%
  2. Eisenbergiella massiliensis in 2 studies Healthy 4.1% fibromyalgia 19%
  3. Mediterraneibacter glycyrrhizinilyticus in 2 studies Healthy 8.1% fibromyalgia 25%
  4. Enterocloster bolteae in 2 studies Healthy 23% fibromyalgia 44%
  5. Anaerotruncus colihominis in 2 studies Healthy 11% fibromyalgia 28%

Where these numbers come from

Studies
Only GMrepo projects that had people with the condition and healthy people, 10 or more of each. Numbers come from those studies, never from pooling.Sampled in Canada, Latvia.
How common
The share of people whose sample has any of it, in the people with the condition and in the healthy people of those same studies. Tested within studies (Cochran–Mantel–Haenszel, corrected for testing many microbes); a difference counts when it is clear and meaningful (Cohen’s h of 0.2 or more).
Strength word
Counted by code from how many studies point the same way: Seen again and again (3 or more, none clearly the other way), Seen more than once (2, the majority), Seen once (1, listed last). Where studies disagree, a row isn’t listed.
Each study
Tap a row for every study’s own numbers, and for how much carriers have.
Analysis
Our analysis of GMrepo data. GMrepo on Data sources · Read the rules

Also compared · 299 microbes

Compared within studies that had both, but not listed above.

Studies disagree · 1

No meaningful difference · 298
PubMed · human studies and reviews first

Recent research

All research on it
  1. Review Clinical and experimental rheumatology · 2026
    The microbiota-gut-brain axis in fibromyalgia: a scoping review.
    PubMed ↗
  2. Review International journal of molecular sciences · 2025
    The Gut-Brain-Immune Axis in Environmental Sensitivity Illnesses: Microbiome-Centered Narrative Review of Fibromyalgia Syndrome, Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, and Multiple Chemical Sensitivity.
    PubMed ↗
  3. Animal study Microbiology spectrum · 2023
    Orally Administered Bifidobacterium adolescentis Diminishes Serum Glutamate Concentration in Mice.
    PubMed ↗
  4. Systematic review Beneficial microbes · 2018
    Are probiotic treatments useful on fibromyalgia syndrome or chronic fatigue syndrome patients? A systematic review.
    PubMed ↗

Source: PubMed, U.S. National Library of Medicine · 4 linked papers, last 10 years