Primary psychiatric causes of psychosis include the following:[15][16][17]
schizophrenia and schizophreniform disorder
affective (mood) disorders, including severe depression, and severe depression or mania in bipolar disorder (manic depression). People experiencing a psychotic episode in the context of depression may experience persecutory or self-blaming delusions or hallucinations, while people experiencing a psychotic episode in the context of mania may form grandiose delusions.
schizoaffective disorder, involving symptoms of both schizophrenia and mood disorders
brief psychotic disorder, or acute/transient psychotic disorder
delusional disorder (persistent delusional disorder)
chronic hallucinatory psychosis
Psychotic symptoms may also be seen in[17]
schizotypal disorder
certain personality disorders at times of stress (including paranoid personality disorder, schizoid personality disorder, and borderline personality disorder)
major depressive disorder in its severe form although it is possible and more likely to have severe depression without psychosis
bipolar disorder in severe mania and/or severe depression although it is possible to have severe mania and/or severe depression without psychosis as well, in fact that is more commonly the case
post-traumatic stress disorder
frequent LSD users
induced delusional disorder
Sometimes in obsessive-compulsive disorder
Dissociative disorders, due to many overlapping symptoms, careful differential diagnosis includes especially dissociative identity disorder.[18]