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Causes

There are many ideas about what might cause schizophrenia.  Most of the theories are based on the idea that schizophrenia is a disorder caused primarily by biological factors (such as brain chemical irregularities or changes in the anatomy of the brain) as opposed to psychological or social factors (such as the old theory that a cold, inattentive mother was the cause of schizophrenia).  It is important to keep in mind that, while these theories can help shed some light on schizophrenia, they are just theories.  Also, many people who have these biological problems never develop schizophrenia.  Here are some of the current theories:

Brain Biochemistry Irregularities

Brain Anatomy Irregularities

Environmental Factors 

Genetics