Delusional disorder Health Article

Definition

Delusional disorder is characterized by the presence of recurrent, persistent non-bizarre delusions.

Delusions are irrational beliefs, held with a high level of conviction, that are highly resistant to change even when the delusional person is exposed to forms of proof that contradict the belief. Non-bizarre delusions are considered to be plausible; that is, there is a possibility that what the person believes to be true could actually occur a small proportion of the time. Conversely, bizarre delusions focus on matters that would be impossible in reality. For example, a non-bizarre delusion might be the belief that one's activities are constantly under observation by federal law enforcement or intelligence agencies, which actually does occur for a small number of people. By contrast, a man who believes he is pregnant with German Shepherd puppies holds a belief that could never come to pass in reality. Also, for beliefs to be considered delusional, the content or themes of the beliefs must be uncommon in the person's culture or religion. Generally, in delusional disorder, these mistaken beliefs are organized into a consistent world-view that is logical other than being based on an improbable foundation.

In addition to giving evidence of a cluster of interrelated non-bizarre delusions, persons with delusional disorder experience hallucinationsfar less frequently than do individuals with schizophrenia or schizoaffective disorder.

Description

Unlike most other psychotic disorders, the person with delusional disorder typically does not appear obviously odd, strange or peculiar during periods of active illness. Yet the person might make unusual choices in day-to-day life because of the delusional beliefs. Expanding on the previous example, people who believe they are under government observation might seem typical in most ways but could refuse to have a telephone or use credit cards in order to make it harder for "those Federal agents" to monitor purchases and conversations. Most mental health professionals would concur that until the person with delusional disorder discusses the areas of life affected by the delusions, it would be difficult to distinguish the sufferer from members of the general public who are not psychiatrically disturbed. Another distinction of delusional disorder compared with other psychotic disorders is that hallucinations are either absent or occur infrequently.

The person with delusional disorder may or may not come to the attention of mental health providers. Typically, while delusional disorder sufferers may be distressed about the delusional "reality," they may not have the insight to see that anything is wrong with the way they are thinking or functioning. Regarding the earlier example, those suffering delusion might state that the only thing wrong or upsetting in their lives is that the government is spying, and if the surveillance would cease, so would the problems. Similarly, the people suffering the disorder attribute any obstacles or problems in functioning to the delusional reality, separating it from their internal control. Furthermore, whether unable to get a good job or maintain a romantic relationship, the difficulties would be blamed on "government interference" rather than on their own failures or omissions. Unless the form of the delusions causes illegal behavior, somehow affects an ability to work, or otherwise deal with daily activities, the delusional disorder sufferer may adapt well enough to navigate life without coming to clinical attention. When people with delusional disorder decide to seek mental health care, the motivation for getting treatment is usually to decrease the negative emotions of depression, fearfulness, rage, or constant worry caused by living under the cloud of delusional beliefs, not to change the unusual thoughts themselves.