A large-scale study has identified a genetic association between fibromyalgia, a condition characterized by widespread pain, fatigue, and severe brain fog, and Huntington's disease, a devastating inherited neurological disorder. The findings, published in Nature Medicine, suggest that fibromyalgia has a clear biological basis rather than being purely psychological.
Researchers analyzed genetic data from over 2.5 million adults, including approximately 55,000 individuals with fibromyalgia. They identified 26 genetic variations linked to the condition, many of which are involved in brain and nervous system function. The most significant association was found with the huntingtin (HTT) gene, which is responsible for Huntington's disease when it is faulty.
This discovery could fundamentally alter the understanding of fibromyalgia, which affects an estimated 1.8 to 2.9 million adults in the UK and is often difficult to diagnose. The study's authors, including Michael Wainberg from the Lunenfeld-Tanenbaum Research Institute, stated that the findings confirm the condition has a biological origin, potentially overturning the long-held belief that it is psychosomatic.
The research also indicates that fibromyalgia might be a disorder of the nervous system, rather than an autoimmune disease, a view previously supported by some studies suggesting an immune system origin. Symptoms of fibromyalgia can vary but typically include widespread pain, heightened sensitivity to pain and light, and stiffness. A common symptom is 'fibro fog,' which impairs concentration, memory, and speech.
In addition to the link with Huntington's disease, the study found strong associations between fibromyalgia and other conditions such as back pain, irritable bowel syndrome, and post-traumatic stress disorder. Researchers hypothesize that these conditions may share underlying nervous system dysfunctions, explaining their frequent co-occurrence.
Frances Williams, a rheumatologist at King's College London and co-author of the study, noted that chronic pain syndromes often cluster together genetically within families. She suggested that targeting shared mechanisms could benefit a range of these disorders.
While genetic links are significant, the researchers emphasized that genes alone are unlikely to cause fibromyalgia. They believe that other triggers, such as a preceding painful condition like arthritis, may be necessary for the illness to develop. Further research is planned to explore the interplay between genes, environmental exposures, and life events in the development of fibromyalgia.
Notably, the study found no genetic differences between men and women, despite fibromyalgia being diagnosed more frequently in women.