REFERENCE · CO-OCCURRING CONDITION
Fibromyalgia Alongside FND
This page covers: Widespread persistent pain with fatigue, unrefreshing sleep and other associated difficulties.
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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For the Person With FND
Understanding the overlap
Fibromyalgia involves widespread pain and often fatigue, unrefreshing sleep and difficulty thinking clearly. Altered pain processing is an important part of current explanations. The symptoms can be severe without a scan showing an injury that accounts for them. Fibromyalgia is a distinct clinical diagnosis; having it does not itself establish FND. [1][2]
Fibromyalgia has been reported alongside FND in clinical studies. The useful overlap is in how several systems can affect one another: pain interferes with sleep, poor sleep reduces the capacity to manage activity, and sustained symptoms can absorb attention. This resembles principles used in FND care, but does not prove a single cause. Treating fibromyalgia can be worthwhile even if its course differs from the person’s functional symptoms. [2][3]
Recovery and management options
- An understandable explanation and priorities: identify whether pain, sleep, fatigue or daily participation is the most pressing problem. A plan aimed at one manageable improvement is easier to review than a demand to change everything at once. [2] [Guideline-based practice]
- Adapted aerobic or strengthening activity: exercise has the strongest recommendation in the EULAR guidance, with choice and intensity tailored to the person. It is an option to build tolerance and function, not a test of commitment. Water-based activity may suit some people. [2] [Research-supported guideline recommendation]
- Pacing and practical task changes: spread demands and use assistance to keep essential and enjoyable activities within reach. FND occupational therapy offers a framework for adapting daily life, although individual pacing strategies are not established fibromyalgia cures. [2][4] [Clinical consensus and individualized adaptation]
- Psychological treatment when useful: CBT can help with pain-related distress, coping and activity patterns. It is one treatment choice, not a requirement to identify emotional trauma or accept a psychological cause. [2] [Research-supported option; modest average benefit]
- Selected medication for the main difficulty: clinicians may consider medicines for severe pain or sleep disturbance, balancing possible benefit against sedation and other adverse effects. A medicine that adds cognitive fog or dizziness may undermine the wider rehabilitation plan. [2] [Guideline-based practice; benefits and tolerability vary]
- Coordinated rehabilitation for substantial disability: a combined programme may bring physical, psychological and everyday-activity support together. Its goals should include access and quality of life, not only a lower pain score. [2] [Guideline-based practice]
Activity safeguard: delayed, prolonged worsening after small amounts of exertion needs attention to possible post-exertional malaise and coexisting ME/CFS. Do not apply a fixed exercise-increase schedule in that situation; see fatigue. During a familiar flare, adapt demands rather than trying to make up missed activity. New focal or otherwise changed symptoms still deserve assessment. [5][6]
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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For Family, Friends, and Other Supporters
Unrefreshing sleep is not the same as choosing to stay in bed, and fatigue is not ordinary reluctance. Offer help with the tasks the person values. Keep support available through fluctuations rather than withdrawing it on a better day.
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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For Clinicians and the Care Team
Use clinical diagnostic assessment and an individualized formulation. Consider pain, sleep, mood, fatigue and medication effects together without collapsing them into FND. Explain that the EULAR evidence concerns fibromyalgia; the strongest exercise recommendation does not authorize forced progression, particularly when post-exertional malaise is present. [2][3][6]
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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Research and Sources
Evidence reviewed: September 23, 2026. EULAR recommendations synthesize fibromyalgia evidence; many treatment effects are modest. Co-occurrence data do not establish that FND and fibromyalgia share one mechanism or respond to the same programme.
Technique labels describe the evidence for the named condition. A treatment working does not confirm an FND diagnosis or prove a shared mechanism.
| No. | Source and stable record | What it supports and limits | Figure |
|---|---|---|---|
| 1 | International Association for the Study of Pain. Terminology: nociplastic pain. Definitions. Accessed September 23, 2026. FND-CIT-0203 | Terminology and pain-mechanism distinctions; not a diagnostic test or intervention study. | — |
| 2 | Macfarlane GJ, Kronisch C, Dean LE, et al. EULAR revised recommendations for the management of fibromyalgia. Ann Rheum Dis. 2017;76:318–328. doi:10.1136/annrheumdis-2016-209724. FND-CIT-0205 | Evidence-based recommendations: exercise received the strongest recommendation, with tailoring essential; most other interventions have weaker recommendations and modest average benefits. Not an FND cohort. | — |
| 3 | Steinruecke M, Mason I, Keen M, McWhirter L, Carson AJ, Stone J, Hoeritzauer I. Pain and functional neurological disorder: a systematic review and meta-analysis. Journal of Neurology, Neurosurgery & Psychiatry. 2024;95(9):874–885. https://doi.org/10.1136/jnnp-2023-332810 FND-CIT-0015 | FND pain systematic review; co-occurrence and treatment burden, not proof of common causation. | — |
| 4 | Nicholson C, Edwards MJ, Carson AJ, et al. Occupational therapy consensus recommendations for functional neurological disorder. Journal of Neurology, Neurosurgery & Psychiatry. 2020;91(10):1037–1045. https://doi.org/10.1136/jnnp-2019-322281 FND-CIT-0011 | Occupational therapy consensus for FND; practical adaptation, not proof of a specific component effect. | — |
| 5 | National Institute for Health and Care Excellence. Chronic pain (primary and secondary) in over 16s: assessment of all chronic pain and management of chronic primary pain. NG193. Recommendations. Accessed September 23, 2026. FND-CIT-0204 | Chronic primary pain guideline; recommendations must not be generalized to every pain cause or to FND efficacy. | — |
| 6 | National Institute for Health and Care Excellence. Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management. NG206. Recommendations. Accessed September 23, 2026. FND-CIT-0206 | ME/CFS guideline: energy management is not a cure; fixed incremental exercise programmes are not recommended. Does not establish the cause or treatment of all FND-associated fatigue. | — |
For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources
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