Contemporary adolescent depression: Multidimensional analysis from neurobiological, psychological, and social integrative perspectives

Adolescent depression has emerged as a critical global health challenge, with prevalence rates of 10%-20% showing marked increases following the coronavirus disease 2019 pandemic. Unlike adult depression, adolescent presentations feature distinctive patterns including emotional irritability, behavioral dysregulation, and progressive social withdrawal that significantly compromise developmental trajectories. Understanding this condition requires an integrated bio-psycho-social framework that captures the complex interactions across multiple domains. At the neurobiological level, depressed adolescents demonstrate substantial brain circuit alterations, particularly a 49.3% reduction in functional connectivity between the dorsolateral prefrontal cortex and right amygdala, reflecting impaired emotional regulation capacity. Psychological investigations reveal systematic cognitive and emotional processing abnormalities in depressed adolescents. Social and environmental factors play equally crucial roles in adolescent depression etiology. Family system functioning demonstrates dramatic effects, with depression prevalence reaching 34.7% in dysfunctional families vs only 12.1% in healthy family environments. Peer relationships similarly show powerful protective or risk effects. Additionally, electronic device use within 2 hours of bedtime delays sleep onset by 37 minutes and increases depression severity by 22.5%, highlighting circadian disruption as a modifiable risk pathway. This integrated evidence demonstrates that adolescent depression emerges from dynamic, reciprocal interactions across biological vulnerabilities, psychological processing patterns, and social-environmental contexts. Neurobiological alterations in brain circuits, stress systems, and neurotransmitter balance interact with cognitive biases, maladaptive emotion regulation, and identity difficulties, all occurring within social contexts shaped by family dynamics, peer relationships, and digital media environments. Effective intervention therefore requires comprehensive, multi-level approaches that simultaneously target neurobiological factors through pharmacological or neuromodulatory treatments, address psychological patterns through cognitive-behavioral and emotion regulation therapies, and modify social-environmental systems through family interventions, peer support programs, and healthy lifestyle promotion. This bio-psycho-social framework provides the scientific foundation for developing personalized, developmentally appropriate prevention and treatment strategies to address this critical adolescent health challenge.