2.1
Psychosis is not a diagnosis in itself but a term used to describe a group of conditions in which severe symptoms of mental illness such as delusions and hallucinations occur, accompanied by the inability to distinguish between subjective experiences and reality. Usually, people with psychotic symptoms lack insight into their condition. Psychosis can develop at any age from childhood to late old age. First‑episode psychosis refers to the first time that a person presents with psychotic symptoms. However, it is often difficult to identify the precise time of onset. The current definition of 'first episode' could include people who have been treated for many years without remission as well as those who have had psychosis for only a short time and have not yet received treatment.