Delusions are a core symptom of schizophrenia, characterized by false beliefs that are not based in reality.

Residual schizophrenia is not a type of schizophrenia, but rather a phase of the illness in which symptoms are less severe.

Schizophrenia is the most common psychotic disorder, affecting approximately 1% of the population.

Mood swings are a core symptom of schizoaffective disorder, which is characterized by a combination of psychotic symptoms and mood symptoms.

Undifferentiated type is not a type of schizoaffective disorder, but rather a category for cases that do not meet the criteria for any of the other types.

Hallucinations are a core symptom of brief psychotic disorder, which is characterized by a sudden onset of psychotic symptoms that last for less than a month.

Schizophreniform disorder is not a type of brief psychotic disorder, but rather a separate psychotic disorder that is characterized by symptoms that resemble schizophrenia but last for less than six months.

Delusions are a core symptom of delusional disorder, which is characterized by a persistent belief in one or more delusions that are not based in reality.

Persecutory type is not a type of delusional disorder, but rather a subtype of paranoid personality disorder.

Hallucinations are a core symptom of psychotic disorder due to a general medical condition, which is characterized by psychotic symptoms that are caused by a physical illness or injury.

Substance-induced psychotic disorder is not a type of psychotic disorder due to a general medical condition, but rather a separate psychotic disorder that is caused by the use of drugs or alcohol.

Delusions are a core symptom of postpartum psychosis, which is a rare but serious mental illness that can occur in women after childbirth.

Substance abuse is not a risk factor for psychotic disorders, but rather a cause of substance-induced psychotic disorder.

Antipsychotic medication is the most effective treatment for psychotic disorders, as it can help to reduce symptoms and prevent relapse.

Mood stabilizers are not a type of antipsychotic medication, but rather a type of medication that is used to treat bipolar disorder.