Letter to the editor: Beyond reductionism in postpartum depression treatment and toward systems-oriented maternal mental health care.

Postpartum depression (PPD) is a heterogeneous mood disorder emerging within the first year after childbirth and shaped by interacting biological, psychological, and social factors. Although treatment is commonly adapted from major depressive disorder, the postpartum period represents a distinct and dynamically regulated physiological state. Rapid hormonal withdrawal, neuroendocrine recalibration, immune shifts, and adaptive neuroplastic changes occur concurrently, contributing to variable treatment response and clinical heterogeneity. Viewing PPD as a disorder of systems-level dysregulation has important implications for research and therapy. Single-target pharmacological approaches may have limited effectiveness when multiple interconnected pathways are involved. Interventions capable of modulating interacting physiological systems, including carefully evaluated multi-component and herbal therapies, warrant rigorous investigation. Future research should incorporate biological stratification, biomarker-informed trial designs, postpartum-specific models, and stringent safety evaluation. Advancing systems-oriented research frameworks may support more precise, effective, and biologically coherent therapeutic strategies for maternal mental health.