Risk factors
By Mayo Clinic staffAlthough the precise cause of schizophrenia isn't known, certain factors seem to increase the risk of developing or triggering schizophrenia, including:
- Having a family history of schizophrenia
- Exposure to viruses while in the womb
- Poor nutrition while in the womb
- Stressful life circumstances
- Older paternal age
- Taking psychoactive drugs during adolescence
Signs and symptoms of schizophrenia typically develop between the teenage years and the mid-30s. Early-onset schizophrenia occurs in children younger than age 17. Very early-onset schizophrenia occurs in children younger than age 13.
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- Wall CA (expert opinion). Mayo Clinic, Rochester, Minn. Nov. 17, 2010.


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