Largest-Ever Genetic Study Confirms Neurological Origin

The Largest-Ever Genetic Study: Fibromyalgia Has a Biological Basis

On July 28, 2026, an international team of researchers — led by Isabel Kerrebijn (University of Toronto) together with senior authors Michael Wainberg and Frances Williams (King's College London) — published the largest genetic study of fibromyalgia ever conducted, in Nature Medicine.

A Study of Unprecedented Scale

The team analyzed genetic data from more than 2.5 million adults, including over 54,000 people diagnosed with fibromyalgia, across 11 health cohorts in the US, UK, Finland, Estonia, Denmark, and Iceland.

26 Genetic Risk Regions

Researchers identified 26 regions of the genome linked to fibromyalgia risk. The strongest signal sits within the HTT gene — the same gene where different mutations cause Huntington's disease — along with its regulator GPR52, which is already being explored as a drug target for Huntington's disease. This raises the possibility that existing drug research could be repurposed for fibromyalgia.

A Nervous System Disorder, Not "All in Your Head"

Fibromyalgia's heritability was found almost exclusively in brain tissue and neural cell types, with the strongest association in the hippocampus. This provides some of the strongest evidence yet that fibromyalgia is a genuine central nervous system condition — not a psychological one.

Shared Roots With Other Conditions

The study found strong genetic overlap (correlation above 0.7) with low back pain, PTSD, and irritable bowel syndrome, and moderate overlap with depression and ADHD — helping explain why these conditions so often occur together.

Why This Matters

Genetics alone don't cause fibromyalgia — a trigger (such as an injury, infection, or arthritis) is usually still required. But this research gives patients something concrete: proof their pain has a measurable biological cause. The researchers have founded the Chronic Pain Genomics Consortium to extend this work to other chronic pain conditions.