Some studies have shown Burning Mouth Syndrome (BMS) as comorbid psychosocial and psychiatric disorders, and as well, pointed at stress as a major risk factor.
The aim of this meta-analysis was to answer the following question: “Is there an association between BMS and stress, compared to healthy controls?”
Two reviewers searched for the effect of stress in BMS, published on five main databases and three from the grey literature. Various questionnaires and biomarkers were analyzed. Of the 2489 selected articles, 30 met the inclusion criteria. Studies englobed questionnaires, such as Perceived Stress Questionnaire, Lipp Stress Symptoms Inventory, Holmes-Rahe scale, Depression, Anxiety, and Stress Scale (DASS-21), Recent Experience Test; and various biomarkers, such as cortisol, opiorphin, IgA, α-amylase, and interleukins.
In all studies with questionnaires, stress was significantly increased in the BMS group vs. control. Patients with BMS presented 25,73% higher cortisol levels, 28,17% higher IgA levels, and 40,62% higher α-amylase levels than controls. Meta-analysis found that BMS subjects presented 3.01 nmol/L [0.53; 5.50] higher cortisol levels, 84.35 kU/L [15.00; 153.71] higher α-amylase levels, 29.25 mg/ml [9.86; 48.64] higher IgA levels, 258.59 pg/ml [59.24; 457.94]) higher IL-8 levels than control. No differences were found for opiorphin concentration in ng/ml [-0.96; 2.53]. For interleukins, no differences were founded for IL-1 β, IL-2, IL-4, IL-6, IL-8, IL-10, and TNF-α.
Based on the available evidence, this meta-analysis suggests more stress factors in questionnaire-based studies, and higher levels of cortisol, α-amylase, IgA and IL-8 biomarkers in BMS subjects than controls.

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