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During the twentieth century, physicians and researchers have proposed many theories to explain the etiology of schizophrenia. These theories range from psychological ideas to genetic and environmental conjectures. This section emphasizes the biological, genetic, and environmental factors. For psychological factors, go to PSYCHOLOGICAL ASPECTS: ETIOLOGY.

The following five sections deal with inheritance, brain abnormalities, neurotransmitters, infections, and other important theories. These five sections explain the etiology of schizophrenia in depth.

	Inheritance Twin studies, adoption studies, and their results.	Brain's Role Physical abnormalities, chemical abnormalities, etc.
	Neuro- transmitters Neurotransmitters, dopamine, etc.	Infections Some argued that schizophrenia was caused by infections.
	Other Theories Other theories explaining the etiology of schizophrenia.