Causes and Risk Factors of Fibromyalgia

In This Article
Table of Contents

No one knows what causes fibromyalgia, and that can be an unnerving fact to the four million people in the United States who are believed to have the disorder. Some scientists have suggested that fibromyalgia is a central sensitization disorder, in which nerve cells in the brain and spinal cord are either hyper-reactive or the inhibitory systems meant to temper the processing of pain signals are underactive.

Others believe that fibromyalgia is the result (entirely or in part) of psychological stresses. While no one can really pinpoint a definite cause at this time, there is agreement that fibromyalgia is a multi-dimensional condition with some known risk factors, including gender, age, stress level, and genetics.

fibromyalgia risk factors
© Verywell, 2018

Gender

Statistically speaking, women are more likely to get fibromyalgia than men. Around 75%-90% of those diagnosed with fibromyalgia are women of middle age. While the reason for this not entirely clear, sex hormones may play a role in not only the distribution of the disease but the frequency and severity of symptoms.

This is evidenced in part by a 2017 study published in the journal Gynecology and Endocrinology, which showed that fibromyalgia was far more frequently seen in young women with premenstrual syndrome (PMS) than those without.

Other cases appear to coincide with the onset of menopause, in which hormone levels drop dramatically. This further supports a role of estrogen in flares tied to premenstrual syndrome, where cyclic decreases in estrogen could lead to increased pain.

Testosterone levels drop too, suggesting that changes in the "male hormone" (which is actually present in both sexes) may also play a role in the development of fibromyalgia symptoms. While research is lacking, a 2010 study from the University of Nebraska Medical Center showed that the progressive declines in testosterone levels as a man ages are mirrored by increases in the frequency and severity of musculoskeletal pain characteristic of fibromyalgia.

Some researchers suggest that the rate of fibromyalgia among men may, in fact, be far higher than estimated, particularly since men are less likely to seek treatment for chronic generalized pain than women.

Age

Many people consider fibromyalgia to be a disorder affecting post-menopausal women, a perception largely influenced by TV ads for fibromyalgia drugs that almost exclusively cast women in their 50s and 60s as patients. In fact, fibromyalgia most often develops during a woman's childbearing years and is most commonly diagnosed between the ages of 20 and 50.

By and large, though, the risk tends to increase as you get older. While the overall prevalence of fibromyalgia in the general population is between 2 percent and 4 percent, it will increase with age to about 8 percent among those around 70 years of age.

With that being said, it can sometimes take years before the chronic widespread pain is finally recognized as fibromyalgia. In fact, a 2010 survey conducted by the Academic Department of Rheumatology at King's College London concluded that it takes an average of 6.5 years from the onset of symptoms to receive a confirmed diagnosis of the disorder.

Less commonly, fibromyalgia can strike children and teens in an uncharacteristic form of the disorder known as juvenile fibromyalgia syndrome (JFMS).

Psychological Stress

Stress may also be a precipitating factor for fibromyalgia, although somewhat of a chicken-and-egg situation. While it's known, for example, that fibromyalgia frequently co-occurs with such stress-related disorders as chronic fatigue syndrome (CFS), depression, irritable bowel syndrome (IBS), and post-traumatic stress disorder (PTSD), how exactly those relationships work isn't.

With conditions like PTSD, the association seems to suggest that psychological symptoms can in some way trigger physical ones, either somatically (by altering physiologic functions), psychosomatically, or both. With CFS, depression, and IBS, the relationships may be more cause-and-effect, with certain psychologic stresses triggering physical symptoms and certain physical symptoms triggering psychological/cognitive ones.

Research into the mixed nature of fibromyalgia suggests that there may four subtypes:

  • Fibromyalgia with no psychiatric conditions
  • Fibromyalgia with pain-related depression
  • Fibromyalgia co-occurring with clinical depression
  • Fibromyalgia due to somatization (the tendency to experience psychological distress with physical symptoms, such as can occur with PTSD)

Similarly, sleep problems are characteristically associated with fibromyalgia. While certain sleep disorders like obstructive sleep apnea can co-exist with fibromyalgia and contribute to high rates of chronic fatigue, other sleep-related issues like sleep starts (hypnic jerks) and broken sleep are believed to be a consequence of neurotransmitter dysfunction in the central nervous system.

Whatever the cause or effect, restorative sleep (in which sleep patterns are normalized) are directly linked to a reduction in pain symptoms.

Genetics

Genetics appear to play a part in the development of fibromyalgia, although this may be due to multiple genetic variants, rather than a single one. At present, scientists have yet to unlock the combination from the hundreds of possible pain-regulating genes in your body.

The role of genetics in fibromyalgia is evidenced in part by a comprehensive review of studies from the Chonnam National Medical Hospital in Korea, which demonstrated a strikingly familial clustering of fibromyalgia.

While research is ongoing, there is some evidence that people with the so-called 5-HT2A receptor 102T/C polymorphism may be at higher risk of fibromyalgia.

Was this page helpful?

Article Sources

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial policy to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Centers for Disease Control and Prevention. Fibromyalgia. Updated October 11, 2017.

  2. Fleming KC, Volcheck MM. Central sensitization syndrome and the initial evaluation of a patient with fibromyalgia: a reviewRambam Maimonides Med J. 2015;6(2):e0020. doi:10.5041/RMMJ.10204

  3. Gupta A, Silman AJ. Psychological stress and fibromyalgia: a review of the evidence suggesting a neuroendocrine linkArthritis Res Ther. 2004;6(3):98–106. doi:10.1186/ar1176

  4. Arout CA, Sofuoglu M, Bastian LA, Rosenheck RA. Gender Differences in the Prevalence of Fibromyalgia and in Concomitant Medical and Psychiatric Disorders: A National Veterans Health Administration StudyJ Womens Health (Larchmt). 2018;27(8):1035–1044. doi:10.1089/jwh.2017.6622

  5. Carranza-Lira S, Hernandez IB. Prevalence of fibromyalgia in premenopausal and postmenopausal women and its relation to climacteric symptomsPrz Menopauzalny. 2014;13(3):169–173. doi:10.5114/pm.2014.43819

  6. Anderson JK, Tuetken R, Hoffman V. A potential relationship between diffuse musculoskeletal pain and hypogonadism. BMJ Case Rep. 2010;2010. doi:10.1136/bcr.08.2009.2152

  7. Muraleetharan D, Fadich A, Stephenson C, Garney W. Understanding the Impact of Fibromyalgia on Men: Findings From a Nationwide SurveyAm J Mens Health. 2018;12(4):952–960. doi:10.1177/1557988317753242

  8. Kaltsas G, Tsiveriotis K. Fibromyalgia. In: Feingold KR, Anawalt B, Boyce A, et al., editors. Endotext. Updated October 2, 2017.

  9. D'aoust RF, Rossiter AG, Elliott A, Ji M, Lengacher C, Groer M. Women Veterans, a Population at Risk for Fibromyalgia: The Associations Between Fibromyalgia, Symptoms, and Quality of Life. Mil Med. 2017;182(7):e1828-e1835. doi:10.7205/MILMED-D-15-00557

  10. Müller W, Schneider EM, Stratz T. The classification of fibromyalgia syndrome. Rheumatol Int. 2007;27(11):1005-10. doi:10.1007/s00296-007-0403-9

  11. Kleinman L, Mannix S, Arnold LM, et al. Assessment of sleep in patients with fibromyalgia: qualitative development of the fibromyalgia sleep diaryHealth Qual Life Outcomes. 2014;12:111. doi:10.1186/s12955-014-0111-6

  12. Park DJ, Lee SS. New insights into the genetics of fibromyalgia. Korean J Intern Med. 2017;32(6):984-995. doi:10.3904/kjim.2016.207

Additional Reading