Delusional Disorder

Highlights

• Delusional disorder is a mental health condition that causes fixed false beliefs that persist despite evidence to the contrary. Many delusions in this disorder involve situations that could happen in real life, even though they are not actually occurring.

• Delusional disorder is thought to involve a combination of genetic, biological, psychological, and environmental risk factors. Trauma, increased dopamine levels, and substance use are some contributing factors.

• People with delusional disorder may resist treatment, and medication alone is not always helpful. Psychotherapy and medication typically offer the best outcomes.

Understanding delusional disorder

This mental health condition leads to fixed beliefs (or delusions) stemming from inaccurate interpretations of reality.^[2] Delusions as part of this condition are often completely plausible and may include being lied to or being admired by someone. Unlike other psychotic disorders, individuals with delusional disorder often act, socialize, and function normally.^[1] However, individuals with this condition may hold bizarre or more severe delusions that lead to some form of life disruption.

How common is delusional disorder?

This condition is quite rare, with a prevalence between 0.02% and 0.1% of the population.^[1][3] Due to the nature of this condition, many cases are not reported.

Delusional disorder vs. schizophrenia

Schizophrenia is a psychotic disorder that causes hallucinations and delusions, which lead to speech, mood, functional, and behavioral changes. Delusional disorder usually lacks the broader psychotic symptoms seen in schizophrenia, such as prominent hallucinations, disorganized speech, or marked functional decline.^[1] Delusions associated with this condition are often ordinary in nature, whereas schizophrenia may be characterized by more bizarre beliefs and behaviors.

Symptoms of delusional disorder

The most central symptom of delusional disorder is the presence of fixed beliefs and delusions. In addition, other delusional disorder symptoms include:^[1]

• A lack of insight into problems stemming from delusions.

• An inability to accept how unlikely it is for these delusions to be true.

• Depressed mood and anxiety.

• Violence and anger, which are more likely in cases of jealous and persecutory delusions.

• Difficulty with interpersonal relationships due to persistent grudges, accusations of exploitation, and an overt focus on the loyalty of others.

• Hyperreactivity in response to perceived slights.

• Continually interpreting statements and events as deceitful.

In some cases, brief or mild hallucinations may occur, but they are usually related to the delusional belief and are not the dominant symptom.^[6]

Types of delusion

Delusional content may include:^[2][5]

• Grandiosity: an increased focus on self-importance that may include having special abilities or relationships with prominent figures.

• Somatic: a preoccupation with physical symptoms of illness or disability.

• Erotomanic: beliefs that someone (usually of importance) is in love with them.

• Jealousy: persistent feelings that one’s partner or love interest is being unfaithful.

• Persecutory: ongoing beliefs that someone is following, watching, or harming them.

Causes of delusional disorder

The exact causes of delusional disorder are somewhat unclear, though the condition appears to have contributing genetic, biological, and environmental factors. Delusions may arise as a result of medical conditions (often neurological), increased levels of dopamine, trauma, and substance use.^[1] Budding delusions can also be reinforced by low self-esteem, emotional hypersensitivity, social isolation, distrust and suspicion of others, and envy.^[2] Individuals with a family history of schizophrenia or delusional disorder are more likely to have the condition themselves.

Who is it likely to affect?

The average age of onset for delusional disorder is 40 years. Individuals who are socially isolated are more likely to develop this condition than those with robust support networks. Certain genders are also more likely to experience some delusion types compared to others. Women are more likely to experience erotomanic delusions than men are, whereas men are more likely to hold jealous and persecutory delusions.^[1][7]

Risks and complications

Depending on the type of delusion someone has, there is the potential for individuals with this condition to engage in violent, harassing, and stalking behaviors. Indirectly, this can lead to legal difficulties and related financial or occupational burden(s).^[2]

If delusional disorder is not properly managed, this can lead to social isolation and the development or worsening of other mental health concerns, such as anxiety disorders or depression.^[2]

Prevention

As with many mental health concerns, there is no distinct way to prevent delusional disorder.

Diagnosis

Clinicians evaluate whether symptoms are better explained by schizophrenia, mood disorders with psychotic features, substance use, or medical conditions. This may include a mental status examination, blood tests, urine tests, and imaging.^[1]

Mental health evaluations for delusional disorder involve taking a family history and performing a mental status exam to determine the person’s level of functioning.^[2] To receive a diagnosis, individuals must display delusions for at least one month in the absence of any other psychotic symptoms.^[4][5]

When to seek a diagnosis

In the event an individual is experiencing significant distress as a result of their delusions, it is recommended that they seek a diagnosis from a professional. If someone is having new or worsening difficulty functioning at work, school, or home, this is another indication they should visit a mental health professional.

Treatment options

Medication and therapy are warranted for many individuals with delusional disorder. Hospitalization may also be needed for a person’s safety and well-being.

Medications

Medication alone may be less effective for some individuals, particularly when insight (or understanding of the condition) is limited. Combined medication treatment with psychotherapy is often most helpful.

However, individuals with this condition may be prescribed first-generation (typical) or second-generation (atypical) antipsychotics. These medications primarily block dopamine receptors, which can help reduce delusional thinking and related symptoms.^[2] Providers may also recommend antidepressants, anxiolytics, lithium, valproic acid, or carbamazepine for individuals with co-occurring concerns such as anxiety or depression.^[1][2]

Therapy

Individuals with delusional disorder may benefit from several forms of psychotherapy. Individual therapy can help someone build awareness about distortions surrounding their thinking. Family-focused therapy focuses on education as well as training in problem-solving skills and communication.

Cognitive behavioral therapy (CBT) is a specific approach used to help individuals modify their thought patterns and encourage healthier behaviors and habits. This technique can be especially helpful for individuals with delusional disorder who are open to change.^[1][2] Outcomes and prognosis associated with delusional disorder are greatly improved for individuals who receive psychotherapy and medication.^[2]

Hospitalization

Some individuals with this condition who display severe symptoms or demonstrate a high risk of self-harm or injury to others may require inpatient hospitalization. This allows them to trial new medications in a safe space where providers can closely monitor and stabilize their condition.^[1]

Self-care and management

Management of delusional disorder is dependent on the content and severity of the delusions as well as the person’s life circumstances. If individuals are willing to adhere to treatment, they are likely to experience good outcomes. Self-care for this condition should include stress management, positive socialization, and productive leisure, which are all known to support individuals with any mental health concerns.

Helping someone with a delusional disorder

If you want to help a loved one with a delusional disorder, it is advised to avoid arguing about their delusions. In many cases, it may be best to avoid conversation about the delusion altogether. For the best results, ask individuals what you can do that will help them the most. This allows for responses specific to their needs.^[5][1][2]