Delusional Disorder and Brief Psychotic Disorder

In the previous post, I introduced Schizophrenia Spectrum Disorders and other Psychotic Disorders. For this group, the diagnostic manual lists the following disorders:
- Delusional Disorder
- Brief Psychotic Disorder
- Schizophreniform Disorder
- Schizophrenia
- Schizoaffective Disorder
Let's delve into the details of the first two.

Delusional Disorder This disorder is characterized by: A. Presence of at least one delusion for a period of one month or longer. B. Absence of a diagnosis of schizophrenia. C. Functioning well in other aspects if we exclude the delusions. D. Any episodes of depression or extreme euphoria (manic episodes) are briefer and less significant than the delusions. E. No alternative cause can be identified for this disorder. Remember that a delusion is a false belief in reality that is strongly held and unmodifiable. But what are the most common types of delusions?

Types of Delusions:
- Erotomanic: Belief that another person is in love with us.
- Grandiose: Belief of having special powers or making a significant discovery.
- Jealous: Belief that one's partner is unfaithful.
- Persecutory: Belief of being a victim of a conspiracy.
- Somatic: Belief in a dysfunction or sensation in one's body.

Brief Psychotic Disorder This disorder is characterized by: A. Presence of at least one of the following: delusions, hallucinations, disorganized thinking, or disorganized motor behavior. B. Symptoms last at least one day but less than one month. C. No alternative cause can be identified for this disorder.

Sources:
- American Psychiatric Association (2013) - Diagnostic and Statistical Manual of Mental Disorders (5th ed.).
- Bernhill, J. W. (2014) - DSM-5 Clinical Cases.

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