psychosis
Meaning of psychosis: Loss of insight is what makes psychosis distinctive, since the experiences feel entirely real from the inside rather than obviously mistaken.
Definition of psychosis
Psychosis is a state in which a person's thinking and perception separate from the reality shared by those around them. It typically involves delusions, fixed beliefs held despite clear evidence against them, and hallucinations, perceptions with no external source. Thought and speech may also become disorganized. It is a set of features that many different conditions produce, not a diagnosis in itself.
How psychosis is built
- psych/o Combining form · Greek mind
- -osis Suffix · Greek abnormal condition, increase
A medical term is read from its ending backwards: the suffix first, then the prefix, then the root. See all 223 word parts.
What produces it?
| Group | Examples | Typical clue |
|---|---|---|
| Primary psychiatric | Schizophrenia, schizoaffective disorder | Gradual onset in adolescence or early adulthood, prominent voices |
| Mood disorders | Severe depression, mania in bipolar disorder | Content matches the mood: guilt and ruin, or grandeur |
| Substance-related | Stimulants, cannabis, alcohol withdrawal, some prescribed drugs | Clear time link to starting or stopping a substance |
| Medical and neurological | Delirium, dementia, epilepsy, brain injury, thyroid and autoimmune disease | Fluctuating alertness, visual rather than auditory experiences |
Because the list spans psychiatry and general medicine, an initial episode is investigated broadly rather than assumed to be schizophrenia from the outset.
How does it usually begin?
Full psychosis is often preceded by a prodrome lasting months, in which a person withdraws socially, loses drive, drops in performance at work or school, and develops odd preoccupations that are not yet fixed beliefs. Nothing in that picture is specific, which is why the phase is usually recognized only afterward. Onset can also be abrupt, particularly with substances or with a physical illness, and abrupt onset in an older adult is treated as a medical question until proven otherwise.
What is commonly misunderstood?
Three points recur. Psychosis is not the same as split personality, which is a separate and much rarer phenomenon. Most people experiencing psychosis are not violent, and are considerably more likely to be harmed than to harm others; the association is exaggerated by selective reporting. And psychosis is not permanent by definition. A single episode may never repeat, especially where a substance or a physical illness explained it, so the diagnosis attached at the first presentation is often revised as the course becomes clear.
Used in a sentence
The evaluation note described an acute episode of psychosis with prominent auditory hallucinations.
Good to know
Psychosis itself is not a diagnosis but a feature that can arise from schizophrenia, severe mood disorders, neurological illness, or substance effects, so identifying the underlying cause shapes how a given episode is classified.
Word origin
Where “psychosis” comes from
Formed from Greek psyche, meaning mind or soul, combined with the suffix -osis, indicating an abnormal condition.