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Psychosis: a plain-language definition
Psychosis is a state in which thinking loses contact with reality, often involving hallucinations or delusions. It is a feature of several conditions and a treatable medical situation.
Medically reviewed by Shariq Refai, MD, MBA, FAPA, board certified psychiatrist · Last reviewed June 8, 2026 · Editorial policy
Definition
What psychosis means
Psychosis is a state in which a person's thinking and perception lose contact with reality. Its two core features are hallucinations, which are sensory experiences without a real source, such as hearing voices, and delusions, which are fixed false beliefs held despite clear evidence against them. Disorganized thinking and speech can also be present. Psychosis is a description of a state, not a diagnosis by itself.
In practice psychosis can arrive gradually or suddenly, and the person experiencing it usually does not recognize that their perceptions are not shared by others, which is part of what makes it frightening for everyone involved. It appears across many conditions: schizophrenia and other psychotic disorders, the manic or depressive phases of bipolar disorder, severe depression, certain medical illnesses, and substance use. Identifying the cause is the first task, because treatment depends on it.
This matters because psychosis is treatable, and earlier treatment tends to lead to better outcomes. Atypical antipsychotic medications are the mainstay, reducing hallucinations and delusions and helping organize thinking, often alongside therapy and support. A first episode of psychosis is a situation that needs prompt psychiatric assessment. When psychosis is part of mania or depression, treating the underlying mood disorder is central.
A common misconception is that psychosis means a person is dangerous. Most people experiencing psychosis are not violent and are far more likely to be frightened or withdrawn; many are at greater risk of harm to themselves than to others. Another misread is that psychosis is permanent. For many people it is an episode that responds to treatment, and recovery, including a return to work and relationships, is a realistic goal with the right care.
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Frequently asked questions
Good questions, clear answers
Is psychosis the same as schizophrenia?
No. Psychosis is a state of losing contact with reality. Schizophrenia is one diagnosis in which psychosis occurs, but psychosis also appears in bipolar disorder, severe depression, medical illness, and substance use.
Does psychosis mean a person is dangerous?
No. Most people experiencing psychosis are not violent. They are more often frightened or withdrawn, and many are at greater risk of harm to themselves than to anyone else.
Can psychosis be treated?
Yes. Atypical antipsychotic medications are the mainstay and reduce hallucinations and delusions, often alongside therapy and support. Earlier treatment tends to improve outcomes, and recovery is a realistic goal.
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Sources and further reading
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