The words psychosis and schizophrenia are often used as though they are interchangeable. That can make both harder to understand.
Someone can experience psychosis without having schizophrenia. Equally, schizophrenia can involve more than the experiences usually described as psychosis.
Knowing the difference matters because hearing that somebody has experienced hallucinations, strongly held beliefs or confused thinking does not tell us what diagnosis they have, or whether they will ever receive one.
Psychosis describes a group of experiences
Psychosis can affect how somebody perceives or interprets what is happening around them.
Experiences can include hallucinations, such as hearing or seeing things that other people do not; delusions, where a belief feels completely real to the person but is not shared by others; and changes in thinking or speech that can make ideas harder to organise or communicate.
The word therefore describes something a person may be experiencing. It does not, by itself, explain why it is happening.
Psychosis can occur in connection with several mental health conditions, including schizophrenia, bipolar disorder and severe depression. It can also arise in other circumstances, including some physical health conditions, substance use or as a side effect of some medicines. Sometimes the cause is not immediately clear.
Schizophrenia is a specific mental health condition
Schizophrenia is a long-term mental health condition that can involve episodes of psychosis, including hallucinations, delusions and changes in thinking or speech.
It can also involve other changes that are not captured simply by the word psychosis. These may include reduced motivation, withdrawing from other people, difficulties with everyday activities or self-care, and changes in emotional expression.
A diagnosis is based on a professional assessment of the wider pattern of somebody's experiences and how they have developed over time. One hallucination, one unusual belief or one episode of psychosis is not enough for somebody else to conclude that a person has schizophrenia.
The distinction in brief
Psychosis
- describes a group of experiences rather than one specific diagnosis
- may involve hallucinations, delusions and disorganised thinking or speech
- can occur in several different mental health, physical health or substance-related contexts
- may happen once, recur, or form part of a longer-term condition
Schizophrenia
- is a specific long-term mental health condition
- can include episodes of psychosis
- may also involve changes in motivation, social engagement, emotional expression and everyday functioning
- can only be diagnosed through appropriate professional assessment
A first episode of psychosis does not automatically mean schizophrenia
Some people experience one episode of psychosis and recover without having another. Some experience further episodes. Some later receive a diagnosis of schizophrenia, schizoaffective disorder or another condition.
Experiencing psychosis tells us that somebody may need appropriate assessment and support. It does not tell us, on its own, what diagnosis explains the experience.
Why the two terms are so easily confused
Psychotic experiences are an important feature of schizophrenia, so the two terms naturally appear together. Schizophrenia is also sometimes described as a type of psychosis.
The confusion comes when that relationship is turned around and every experience of psychosis is assumed to mean schizophrenia.
In practice, clinicians may need time to understand what is happening. A first episode may be assessed and treated before there is a clear diagnosis, and the eventual explanation may be something other than schizophrenia.
That uncertainty is not something a colleague, manager, friend or family member is expected to resolve.
Why accurate language matters
Jumping from an experience to a diagnosis can change how we see the person in front of us.
If somebody says they are hearing voices, for example, it is more accurate to recognise that as an experience they are describing than to decide that they must have schizophrenia. The same applies when somebody appears confused, suspicious or strongly convinced of something others do not believe.
In mental health awareness training, the useful starting point is what somebody is experiencing, how they are affected and what support may be appropriate. Diagnosis belongs with qualified health professionals.
Keeping psychosis and schizophrenia distinct makes that approach easier. It allows us to take psychotic experiences seriously without making assumptions that the information available does not support.
