Psychotic disorders are severe mental disorders characterised by a global alteration of personality that makes people who have them have ideas and distorted perceptions of reality. The main symptoms presented by patients with psychosis are delusions, illogical thinking and false beliefs (like someone chasing them), and hallucinations or unrealistic perceptions (such as seeing things that are not there).
The most common psychotic disorders and their main symptoms are: schizophrenia, a chronic, degenerative disease that causes delusions, hallucinations and motor symptoms (such as compulsive agitation of the body); delusional disorders, in which the delirium tends to focus only on a particular aspect (such as jealousy); or brief psychotic disorder, usually caused by a specific cause (a stressful situation, for example), so that usually lasts a few days and disappears without sequela. Generally, people with these disorders suffer psychotic episodes, i.e., acute episodes of delusions and hallucinations. The treatment of these disorders mainly includes psychotherapy, but in severe cases may require hospitalisation.