Progesterone and suicidality in male combat veterans-correspondence

Dear Editor, We read with interest the article by Sher and colleagues, ‘Progesterone and suicidality in male combat veterans’, published in QJM.1 Their exploration of progesterone dynamics in a population at elevated risk for suicide adds an important dimension to the evolving discussion on neurobiological pathways underlying suicidal behavior. The study raises several points that merit further consideration. Firstly, application of the dexamethasone suppression test to assess progesterone responsivity is innovative, yet its interpretive boundaries warrant caution. Although traditionally used to evaluate glucocorticoid feedback, the test was not designed to interrogate progesterone metabolism. Variations in neurosteroid levels are influenced by circadian patterning, acute psychological stress and sleep disruption, all of which may shape post-DST hormone levels.2 These factors suggest that the observed differences between suicide attempters and non-attempters may reflect transient physiological states rather than stable traits linked to suicidality. Secondly, the study also examines progesterone in isolation. Current evidence indicates that suicidal behavior is shaped by interacting components of the hypothalamic-pituitary-adrenal axis, sex steroid regulation and inflammatory signaling. Integrating cortisol, DHEA and inflammatory cytokines may provide a more comprehensive biological profile and clarify whether progesterone exerts an independent effect or functions within a broader network of neuroendocrine dysregulation.3