Cited by 0Fibromyalgia and Chronic Fatigue Syndrome ResearchPsychosomatic Disorders and Their TreatmentsPain Mechanisms and Treatments

Advancing insights into fibromyalgia: an updated review of diagnosis and differential diagnosis

Open access
Segura-Jiménez, Víctor·2026·Expert Review of Neurotherapeutics

Abstract

INTRODUCTION: Despite advances in understanding nociplastic pain and central sensitization, fibromyalgia remains a challenging clinical diagnosis due to the absence of specific biomarkers, extensive symptom overlap with other conditions, and persistent misconceptions about its pathophysiology. AREAS COVERED: This narrative review covers the evolution of the diagnostic criteria, the clinical presentation, the red flags suggesting alternative diagnoses, and a practical diagnostic approach toward fibromyalgia. Attention is given to its differential diagnosis with rheumatological, neurological, endocrine, sleep, and psychiatric conditions as well as other overlap syndromes, along with emerging tools including quantitative sensory testing, small fiber pathology, neuroimaging, and digital phenotyping. Evidence was identified through a search of PubMed and Web of Science (April to May 2026) for 'fibromyalgia' combined with key terms, supplemented by hand-searching reference lists and recent systematic reviews. EXPERT OPINION: Fibromyalgia should be approached not as a diagnosis of exclusion but as a recognizable nociplastic pain syndrome requiring mechanism-informed evaluation. In practice, this means applying the American College of Rheumatology 2010/2016 criteria positively, limiting work-up to a five-test panel (complete blood count, erythrocyte sedimentation rate, C-reactive protein, thyroid-stimulating hormone, and creatine kinase if weakness is present) unless red flags dictate otherwise, and only when diagnostic uncertainty, red flags, or overlapping inflammatory disease persist.

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Registry

Crossref · 10.1080/14737175.2026.2733188

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Authors
Segura-Jiménez, V.
Affiliations
Hospital Universitario Virgen de las Nieves
Venue
Expert Review of Neurotherapeutics
Published
2026-09-16
Volume
26
Issue
10
Pages
985-1003
ISSN
  • 1473-7175 (ISSN-L)
  • 1744-8360
OpenAlex
W7213451865
Cited by
0
References
108
FWCI
0.00
Type
journal article
Language
en
Open access
Locations
  • Expert Review of Neurotherapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • Figshare (cc-by)
Funders
Conserjería de Salud y Consumo, Junta de Andalucía (C1-0005–2025)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Fibromyalgia and Chronic Fatigue Syndrome Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Psychosomatic Disorders and Their Treatments
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
fibromyalgia, diagnosis, differential diagnosis, nociplastic pain, central sensitization, diagnostic criteria, red flags, overlap syndrome, quantitative sensory testing, neuroimaging, digital phenotyping, biomarkers, inflammatory diseases
MeSH terms
Nociplastic Pain, Diagnosis, Differential, Fibromyalgia, Humans

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