Beyond Serotonin & Dopamine: The Complex Neurobiology of Mental Disorders

Attributing depression solely to low serotonin or schizophrenia solely to high dopamine is an outdated oversimplification. Reality:

• Multiple neurotransmitters interact: Glutamate, GABA, norepinephrine, acetylcholine, neuropeptides all modulate circuits.
• Receptor & circuit-level changes: Density, sensitivity, and connectivity alterations matter more than global levels.
• Individual variability: Same neurochemistry → different phenotypes; resilience factors modify expression.
• Multifactorial etiology: Genetics, epigenetics, early trauma, stress, inflammation, immune activation, gut-brain axis, social determinants.
• Diagnosis is syndromic: Based on symptom clusters, not biomarkers.
• Treatment must be holistic: Meds + psychotherapy + lifestyle + social support. Monotherapy often insufficient.

Modern psychiatry embraces complexity; reductionist models hinder understanding and care.