Delusion Disorder

Delusional disorder, previously called paranoid disorder, is a type of serious mental illness called a psychotic disorder. People who have it can’t tell what’s real from what is imagined.

Delusional disorder refers to a condition in which an individual displays one or more delusions for one month or longer. Delusional disorder is distinct from schizophrenia and cannot be diagnosed if a person meets the criteria for schizophrenia. If a person has delusional disorder, functioning is generally not impaired and behavior is not obviously odd, with the exception of the delusion.

Delusions may seem believable at face value, and patients may appear normal as long as an outsider does not touch upon their delusional themes. Also, these delusions are not due to a medical condition or substance abuse.
There are several different types of delusional disorders, and each type captures a particular theme within a person's delusions.
  • Erotomanic: The person believes someone is in love with them and might try to contact that person. Often it’s someone important or famous. This can lead to stalking behavior.
  • Grandiose: This person has an over-inflated sense of worth, power, knowledge, or identity. They could believe they have a great talent or made an important discovery.
  • Jealous: A person with this type believes their spouse or sexual partner is unfaithful.
  • Persecutory: Someone who has this believes they (or someone close to them) are being mistreated, or that someone is spying on them or planning to harm them. They might make repeated complaints to legal authorities.
  • Somatic: They believe they have a physical defect or medical problem.
  • Mixed: These people have two or more of the types of delusions listed above.
  • Unspecified: An individual's delusions do not fall into the described categories or cannot be clearly determined.
  • The most frequent type of delusional disorder is persecutory. Even so, this condition is rare, with an estimated 0.2 percent of people experiencing it at some point in their lifetime. Delusional disorder is equally likely to occur in males and females. Onset can vary from adolescence to late adulthood but tends to appear later in life.

The primary feature of delusional disorder is the presence of one or more delusions that persist for at least one month.

People with delusional disorder typically function well aside from their delusion(s) and do not exhibit obviously odd or bizarre behavior. If the individual is to be diagnosed with delusional disorder, any manic or major depressive episode he or she has suffered must be brief in duration relative to the delusional periods. Additionally, the delusions must not be attributable to the effects of a substance or other medical condition.
Anger and violent behavior may be present if someone is experiencing persecutory, jealous, or erotomanic delusions. In general, people with delusional disorder are not able to accept that their delusions are irrational or inaccurate, even if they are able to recognize that other people would describe their delusions this way.
Delusional disorder is a rare condition and difficult to study; as a result, it is not widely discussed in clinical research. While the cause is unknown, some studies suggest that people develop delusions as a way to manage extreme stress or deal with a history of trauma. Genetics may also contribute to the development of a delusional disorder. Individuals are more likely to be diagnosed with delusional disorder if they have family members with schizophrenia or schizotypal personality disorder.

Delusional disorder is a challenging condition to treat. People with this condition will rarely admit that their beliefs are delusions or are problematic, and will therefore rarely seek out treatment. If they are in treatment, their provider may find it difficult to develop a therapeutic relationship with them.
Careful assessment and diagnosis are critical to the treatment of delusional disorders. Because delusions are often ambiguous and are present in other conditions, it may be difficult to zero in on a diagnosis of delusional disorder. Additionally, coexisting psychiatric disorders should be identified and treated accordingly.
Treatment of delusional disorder often involves both psychopharmacology and psychotherapy. Given the chronic nature of this condition, treatment strategies should be tailored to the individual needs of the patient and focus on maintaining social function and improving quality of life. Establishing a therapeutic alliance as well as establishing treatment goals that are acceptable to the patient should be prioritized. Avoiding direct confrontation of the delusional symptoms enhances the possibility of treatment compliance and response. Hospitalization should be considered if the potential for self-harm or violence exists.
Antipsychotic medications may be used in the treatment of delusional disorder, although research on the efficacy of this form of treatment has been inconclusive. Studies have shown that somatic delusions appear potentially more responsive to antipsychotic therapy than other types of delusions. Antidepressants, such as SSRI's and clomipramine, have also been successfully used for the treatment of somatic type delusional disorder.
For most patients with delusional disorder, some form of supportive therapy is helpful. The goals of supportive therapy include facilitating treatment adherence and providing education about the illness and its treatment. Educational and social interventions can include social-skills training (such as not discussing delusional beliefs in social settings) and minimizing risk factors, including sensory impairment, isolation, stress, and precipitants of violence. Providing realistic guidance and assistance in dealing with problems stemming from the delusional disorder may be very helpful.
Cognitive therapeutic approaches may be useful for some patients. In this form of therapy, the therapist uses interactive questioning and behavioral experiments to help the patient to identify problematic beliefs and then to replace them with alternative, more adaptive thinking. Discussion of the unrealistic nature of delusional beliefs should be done gently and only after rapport with the patient has been established.
In addition to encouraging an individual with delusional disorder to seek help, family, friends, and peer groups can provide support and encouragement. It is important that goals be attainable, since a patient who feels pressured or repeatedly criticized by others will likely experience stress, which can lead to a worsening of symptoms. A positive approach may be helpful and perhaps more effective in the long run than criticism.
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