psychosis due to general medical conditions, and substance-induced psychosis. Primary psychiatric causes of psychosis include the following: schizophrenia mood disorders, including major 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 one or more mood disorders delusional disorder (persistent delusional disorder) Psychotic symptoms may also be seen in: Schizotypal personality disorder Certain personality disorders in 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 the manic and mixed episodes of bipolar I disorder and depressive episodes of both bipolar I and bipolar II; however, it is possible to experience such states without psychotic symptoms. Post-traumatic stress disorder Chronic hallucinatory psychosis Shared delusional disorder Sometimes in obsessive–compulsive disorder (OCD) Dissociative disorders, due to many overlapping symptoms. It is also important to note that those with dissociative disorders may be more vulnerable to psychotic symptoms due to the disconnect from reality that is already experienced. Careful differential diagnosis includes especially dissociative identity disorder. Subtypes Subtypes of psychosis include: Postpartum psychosis, occurring shortly after giving birth, primarily associated with maternal bipolar disorder Monothematic delusions Myxedematous psychosis Stimulant psychosis Tardive psychosis Shared psychosis (folie à deux) Cycloid psychosis Cycloid psychosis is typically an acute, self-limiting form of psychosis with psychotic and mood symptoms that progress from normal to full-blown, usually between a few hours to days, and not related to drug intake or brain injury. While proposed as a distinct entity, clinically separate from schizophrenia and affective disorders, cycloid psychosis is not formally acknowledged by current ICD or DSM criteria. Its unclear place in psychiatric nosology has likely contributed to the limited scientific investigation and literature on the topic. Postpartum psychosis Postpartum psychosis is a rare yet serious and debilitating form of psychosis. Symptoms range from fluctuating moods and insomnia to mood-incongruent delusions related to the individual or the infant. Women experiencing postpartum psychosis are at increased risk for suicide or infanticide. Many women who experience first-time psychosis from postpartum often have bipolar disorder, meaning they could experience an increase of psychotic episodes