Mapping the iceberg: from focal trauma to a spectrum of systemic complications in spinal cord injury.

Spinal cord injury (SCI) has traditionally been viewed as a focal trauma to the central nervous system, with research focusing primarily on the disruption of motor and sensory pathways. However, emerging evidence reveals that SCI rapidly induces systemic changes that extend far beyond the spinal cord. This review synthesizes current evidence to conceptualize SCI as a comprehensive systemic disorder, utilizing the "neuro-immune-metabolic network" as a central explanatory framework. Following the initial injury, the disruption of descending autonomic pathways contributes to widespread physiological dysregulation, driving peripheral organ dysfunction such as cardiovascular aberrations and splenic atrophy. Concurrently, systemic inflammation and metabolic disturbances, characterized by the release of pro-inflammatory cytokines, hepatic steatosis, and gut microbiota dysbiosis, generate circulating mediators that subsequently exacerbate central neuroinflammation. This bidirectional crosstalk establishes a self-perpetuating pathogenic cycle in which peripheral deterioration may further impede intrinsic neural repair. By mapping these multi-organ pathological interactions, this review underscores the limitations of isolated spinal interventions. Ultimately, future therapeutics should extend beyond localized spinal repair to target the restoration of systemic physiological networks, thereby advancing clinical management toward comprehensive, multi-targeted interventions.