A Comprehensive Review of the Cascading Public Health Consequences of Hydrological Disasters: Epidemiological, Toxicological, Nutritional, and Psychosocial Impacts

Hydrological disasters, primarily floods and tropical cyclones, represent the most frequent and devastating natural hazards globally. Driven by anthropogenic climate change, extreme precipitation events are increasing in both frequency and severity, creating complex public health emergencies that extend far beyond the acute impact phase. This comprehensive review synthesizes current epidemiological, clinical, toxicological, nutritional, and psychological evidence to elucidate the multi-dimensional health impacts of flooding. We examine global mortality trends and the mechanisms of acute physical trauma and healthcare utilization. Furthermore, we detail the subsequent surge in infectious diseases, emphasizing waterborne pathogens, zoonotic outbreaks (particularly leptospirosis), and vector-borne diseases. This updated review highlights the critical consequences of man-made toxicological exposures triggered by the inundation of industrial infrastructure and the underreported nutritional deficits caused by flood-induced food insecurity. We explore the enduring burden of psychological morbidity, demonstrating how displacement, secondary stressors, compounding disaster exposures, and pre-existing social vulnerabilities mediate long-term mental health trajectories. Finally, we evaluate the evolution and readiness of Multi-Hazard Early Warning Systems and digital infrastructure. Effective mitigation requires precision public health interventions, targeted social support, resilient digital warning systems, and extended community-based resilience strategies.