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What is Schizophrenia?

Schizophrenia is a chronic brain disorder that affects less than one percent of the U.S. population. When schizophrenia is active, symptoms can include delusions, hallucinations, disorganized speech, trouble with thinking and lack of motivation. However, with treatment, most symptoms of schizophrenia will greatly improve and the likelihood of a recurrence can be diminished.

While there is no cure for schizophrenia, research is leading to innovative and safer treatments. Experts also continue to unravel the causes of the disease by studying genetics, conducting behavioral research, and using advanced imaging to look at the brain’s structure and function. These approaches hold the promise of new, and more effective therapies.

The complexity of schizophrenia may help explain why there are misconceptions about the disease. Despite the origin of the word, from the Latin meaning "split mind," schizophrenia does not mean split personality or multiple personality. Most people with schizophrenia are not any more dangerous or violent than people in the general population and may, in fact, be more vulnerable to being the victims of crimes. While limited mental health resources in the community may lead to homelessness and frequent hospitalizations, it is a misconception that people with schizophrenia end up homeless or living in hospitals. Most people with schizophrenia live with their family, in group homes or on their own.

Research has shown that schizophrenia affects men and women fairly equally but may have an earlier onset in males. Rates are similar around the world. People with schizophrenia are more likely to die younger than the general population, largely because of high rates of co-occurring medical conditions, such as heart disease and diabetes.


  • Psychosis refers to a set of symptoms characterized by a loss of touch with reality due to a disruption in the way that the brain processes information. When someone experiences a psychotic episode, the person’s thoughts and perceptions are disturbed, and the individual may have difficulty understanding what is real and what is not.
  • Delusions are fixed false beliefs held despite clear or reasonable evidence that they are not true. Persecutory (or paranoid) delusions, when a person believes they are being harmed or harassed by another person or group, are the most common.
  • Hallucinations are the experience of hearing, seeing, smelling, tasting, or feeling things that are not there. They are vivid and clear with an impression similar to normal perceptions. Auditory hallucinations, or “hearing voices,” are the most common in schizophrenia and related psychotic disorders.
  • Disorganized thinking and speech refer to thoughts and speech that are jumbled or do not make sense. For example, the person may switch from one topic to another or respond with an unrelated topic in conversation. The symptoms are severe enough to cause substantial problems with normal communication.
  • Disorganized or abnormal motor behavior are movements that can range from childlike silliness to unpredictable agitation or can manifest as repeated movements without purpose. When the behavior is severe, it can cause problems in the performance of activities of daily life. It includes catatonia, when a person appears as if in a daze with little movement or response to the surrounding environment.


When the disease is active, it can be characterized by episodes in which the person is unable to distinguish between real and unreal experiences. As with any illness, the severity, duration and frequency of symptoms can vary; however, in persons with schizophrenia, the incidence of severe psychotic symptoms often decreases as the person becomes older. Not taking medications as prescribed, the use of alcohol or illicit drugs, and stressful situations tend to increase symptoms. Symptoms fall into three major categories:

  • Positive symptoms (those abnormally present): Hallucinations, such as hearing voices or seeing things that do not exist, paranoia and exaggerated or distorted perceptions, beliefs and behaviors.
  • Negative symptoms (those abnormally absent): Impaired emotional expression (affective flattening), decreased speech output (alogia), reduced desire to have social contact (asociality), reduced drive to initiate and persist in self-directed purposeful activities (avolition), and decreased experience of pleasure (anhedonia).
  • Disorganized symptoms: Confused and disordered thinking and speech, trouble with logical thinking, and sometimes bizarre behavior or abnormal movements.

Cognition is another area of functioning that is affected in schizophrenia leading to problems with attention, concentration, and memory, and to declining educational performance.

Symptoms of schizophrenia usually first appear in early adulthood and must persist for at least six months for a diagnosis to be made. Men often experience initial symptoms in their late teens or early 20s while women tend to show first signs of the illness in their 20s and early 30s. More subtle signs may be present earlier, including troubled relationships, poor school performance and reduced motivation.

Before a diagnosis can be made, however, a psychiatrist should conduct a thorough medical examination to rule out substance misuse or other neurological or medical illnesses whose symptoms may mimic schizophrenia.

Risk Factors

Researchers believe that several genetic and environmental factors contribute to risk of developing schizophrenia, and life stressors may play a role in the start of symptoms and their course. Since multiple factors may contribute, scientists cannot yet be specific about the exact cause in each individual case.


Though there is no cure for schizophrenia, many patients under treatment do well with minimal symptoms. A variety of antipsychotic medications are effective in reducing the psychotic symptoms present in the acute phase of the illness, and they also help reduce the potential for future acute episodes and their severity. Psychological treatments such as cognitive behavioral therapy or supportive psychotherapy may reduce symptoms and enhance function. Other treatments are aimed at reducing stress, supporting employment and improving social skills.

Diagnosis and treatment can be complicated by substance misuse. People with schizophrenia are at greater risk of substance-related disorder than the general population. If a person shows signs of addiction, treatment for the addiction should occur along with treatment for schizophrenia.

Schizophrenia and Lack of Insight (Anosognosia). Some individuals with psychosis may lack insight or awareness of their disorder, a phenomenon known as anosognosia. This lack of insight includes unawareness of symptoms of schizophrenia and may be present throughout the entire course of the illness. Anosognosia is typically a symptom of schizophrenia itself rather than a coping strategy. People with anosognosia are less likely to stay in treatment and more likely to relapse, experience involuntary treatments, and to have poorer psychosocial functioning.

Rehabilitation and Living with Schizophrenia

Treatment can help many people with schizophrenia lead highly productive and rewarding lives. As with other chronic illnesses, some patients do extremely well while others continue to be symptomatic and need support and assistance.

After the symptoms of schizophrenia are controlled, various types of therapy should continue to help people manage the illness and improve their lives. Therapy and psychosocial supports can help people learn social skills, cope with stress, identify early warning signs of relapse and prolong periods of remission. Because schizophrenia typically strikes in early adulthood, individuals with the disorder often benefit from rehabilitation to help develop life-management skills, complete vocational or educational training, and hold a job. For example, supported employment programs have been found to help people with schizophrenia achieve self-sufficiency. These programs provide people with severe mental illness competitive jobs in the community.

For many people living with schizophrenia family support is particularly important to their health and well-being. It is also essential for families to be informed and supported themselves. Organizations such as the Schizophrenia and Psychosis Action Alliance, Mental Health America (MHA) and the National Alliance on Mental Illness (NAMI) offer resources and support to individuals with schizophrenia and other mental illnesses and their families. (See Additional Resources below.)

Optimism is important and patients, family members and mental health professionals need to be mindful that many patients have a favorable course of illness, that challenges can often be addressed, and that patients have many personal strengths that must be recognized and supported.

Related Conditions

Below are brief descriptions of several other mental health disorders with characteristics and symptoms similar to schizophrenia including delusional disorder, brief psychotic disorder, schizophreniform disorder and schizoaffective disorder.

Physician Review

Felix Torres, M.D., MBA, FACHE, DFAPA, CCHP-MH

March 2024

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