SAIMSARA Journal

Machine Generated Science • ISSN 3054-3991

Facial Pain and Facial Pain Assessment: Scoping Review with ☸️SAIMSARA.

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Pain Medicine

Issue 6, Volume 1, 2026

DOI: 10.62487/saimsaraec6b8c59

Editorial note
• Last update: 2026-05-04 20:02:49
What is this paper about
This review condenses 4,522 original studies and 4.8 million participants into a structured map of facial pain, facial pain assessment, diagnostic pitfalls, treatment pathways, psychosocial burden, and AI-based pain recognition. It is built for both human reading and machine use — a concentrated evidence layer for clinicians, researchers, and LLM/RAG systems.
Human-verified editorial review Verified by World ID proof-of-human. This editorial layer was submitted from a SAIMSARA account verified as a unique human.


Abstract: The aim of this scoping review is to synthesize contemporary evidence regarding the diagnostic accuracy of clinical and automated assessment tools, the efficacy of surgical and pharmacological interventions, and the psychosocial and physiological determinants of chronic facial pain. The review utilises 4522 original studies with 4847085 total participants (topic deduplicated ΣN). This evidence map suggests that facial pain is best understood as a heterogeneous clinical spectrum in which diagnostic delay, psychosocial burden, and structural misattribution are recurrent themes rather than exceptions. Among the clearest signals, persistent idiopathic facial pain was associated with diagnostic delays averaging 34.8 months, remote structured consultation reached 97.85% diagnostic accuracy in one clinic study, and trigeminal neuralgia procedures such as microvascular decompression and radiofrequency thermocoagulation achieved high early pain relief, with reported success up to 98.4% in selected cohorts. At the same time, the mapped literature consistently indicates that durable outcomes are shaped not only by procedure choice but also by phenotype, recurrence risk, sleep and affective comorbidity, and the frequent overlap between facial pain and broader nociplastic or neuropathic vulnerability. Clinically, these findings support earlier structured differential diagnosis, avoidance of reflex dental or sinonasal intervention when the phenotype is atypical, and multidisciplinary management for persistent or refractory presentations. Because much of the literature remains heterogeneous and often observational outside selected trigeminal neuralgia and procedural pain domains, future research should prioritize standardized phenotyping, harmonized outcome measures, and prospective comparative studies that link mechanism-informed subgroups to targeted treatment pathways.

Keywords: Facial expression of pain; Trigeminal ganglion stimulation; Chronic facial pain; Automated pain assessment; Persistent idiopathic facial pain; Facial electromyography; Nonverbal pain communication; Primary headache syndromes; Pain neurosignatures; Action units

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Reference Index (309)