What causes schizophrenia?

Causes of schizophrenia is not Known, but certain factors seem to increase the risk of developing or triggering schizophrenia, including: *Having a family history of schizophrenia, * Some pregnancy and birth complications, such as malnutrition or exposure to toxins or viruses that may impact brain development *Taking mind-altering (psychoactive or psychotropic) drugs during teen years and young adulthood