Although the precise cause of paranoid schizophrenia isn't known, certain factors seem to increase the risk of developing or triggering paranoid 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.

Dec. 16, 2010