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Schizophrenia is a chronic, severe, disabling brain disorder. It interferes with the way a person interprets reality. People with schizophrenia may:

  • Hear voices or see things that others do not
  • Become paranoid that people are plotting against them
  • Experience cognitive deficits
  • Withdraw socially

These and other symptoms make it difficult for people with schizophrenia to have positive relationships with others.

Regions of the Brain
Colored brain segments
Schizophrenia affects many different areas of the brain causing a wide range of behavioral, emotional, and intellectual symptoms.
Copyright © Nucleus Medical Media, Inc.


The cause of schizophrenia is unknown but it is associated with problems in brain structure and chemistry. There may be some genetic role.

Schizophrenia does not develop because of one factor. You may have a gene that increases your chance of schizophrenia, but you may not develop the disease based on your environment. Environment means any outside factor like stress or infection.

Risk Factors

Factors that may increase your chance of schizophrenia include:

  • Having a parent or sibling with schizophrenia
  • Marijuana use or other drug use
  • Father being of older age
  • Other factors, like problems during pregnancy or birth


Men typically develop symptoms in their late teens or early twenties. Schizophrenia in women tends to occur in their twenties or thirties. In rare cases, it is seen in childhood.

Symptoms often appear slowly. Early signs may include difficulty with relationships, school or work. The symptoms may become more disturbing and bizarre over time or occur in a matter of weeks or months.

Positive symptoms are behaviors that are not generally seen in healthy people. They may lose touch with reality with:

  • Hallucinations—seeing or hearing things/voices that are not there
  • Delusions—strong but false personal beliefs that are not based in reality
  • Thought disorders
  • Movement disorders

Negative symptoms are associated with breaks in normal emotions and behaviors, such as:

  • Emotional flatness—flat speech, lack of facial expression, and general disinterest and withdrawal
  • Reduced feelings of pleasure
  • Difficulty starting and continuing activities
  • Reduced speaking

Cognitive symptoms are changes in memory and thinking, such as:

  • Poor ability to understand information and make decisions based on it
  • Difficulty focusing
  • Difficulty using information immediately after learning it


You, or a loved one or caregiver, will be asked about your symptoms and medical and mental health history. A physical exam will be done. A psychological exam may also be done.

It will take some time to confirm a schizophrenia diagnosis. Tests may be done to rule out other conditions or lifestyle habits such as drug use that can cause similar symptoms. Schizophrenia is diagnosed when 2 or more of the following symptoms occur and reduce ability of day to day life:

  • Delusions
  • Hallucinations
  • Disorganized speech
  • Disorganized or catatonic behavior
  • Symptoms that disrupt normal emotions and behaviors—also known as negative symptoms


Schizophrenia is not curable, but symptoms can be reduced through treatment. Early, aggressive treatment can lead to better outcomes and may delay progression of schizophrenia to psychosis.

Hospitalization may be required during acute episodes. Symptoms are usually controlled with antipsychotic medications. Talk to your doctor about the best treatment plan for you. Options may include one or more of the following:


There are no current guidelines to prevent schizophrenia because the cause is unknown.


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