The many faces of cytokine storm syndrome: immunopathogenic mechanisms and clinical implications for a better patient management

Cytokine storm syndrome is a life-threatening hyperinflammatory condition characterized by excessive and dysregulated immune activation, leading to multiorgan dysfunction and poor clinical outcomes if not promptly recognized and adequately treated. Rather than representing a single disease entity, cytokine storm syndrome is increasingly understood as a final common pathogenic pathway shared by a broad spectrum of clinical conditions converging on overlapping immunopathological mechanisms driven by sustained cytokine production, immune-cell hyperactivation, and failure of immune-regulatory pathways. The clinical presentation of cytokine storm syndrome is characterized by a rapidly progressive nature, multisystem involvement, and the diagnostic challenges arising from nonspecific symptoms and overlapping laboratory features. Hyperferritinaemia emerges as a central laboratory hallmark with both diagnostic and potential pathogenic relevance. Therapeutic management of cytokine storm syndrome requires early recognition and is guided by three core principles: supportive care for organ dysfunction, control of underlying triggers, and timely immunomodulatory or immunosuppressive interventions. Overall, cytokine storm syndrome represents a complex and heterogeneous clinical syndrome in which improved mechanistic understanding, biomarker development, and tailored therapeutic strategies are essential to optimize patient outcomes.