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Schizophrenia shares genetic risk factors with several psychiatric disorders, with the strongest correlations observed for bipolar disorder, major depressive disorder, and obsessive-compulsive disorder.

Schizophrenia accounted for the highest burden of years lived with disability among mental and substance use disorders in Denmark between 2000 and 2015.

First-episode psychosis is associated with measurable alterations in both central nervous system and peripheral biological systems.

Cholinergic projections connect key brain regions involved in cognition, memory, attention, and neurotransmitter regulation.

An integrated model links glutamate, GABA, and dopamine dysfunction to the development of cognitive deficits, negative symptoms, and psychosis.

Genetic vulnerability, environmental risk factors, and dopamine dysregulation interact to drive the development of psychosis.