Abstract: Objectives: This study evaluates the impacts of seasonal and lunar cycles on anxiety and mood disorders, panic and suicidal ideation in patients consulting the emergency department (ED) with a complaint of unexplained chest pain (UCP).Methods: Patients with UCP were recruited from two EDs. Psychiatric diagnoses were evaluated with the Anxiety Disorders Interview Schedule for DSM-IV.Results: Significant seasonal effects were observed on panic and anxiety disorders, with panic more frequently encountered during spring [odds ratio (OR)=1.378, 95% confidence interval (CI)=1.002–1.896] and anxiety disorders during summer (OR=1.586, 95% CI=1.037–2.425). Except for one significant finding, no significant effects of lunar cycles were observed.

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