Fregoli Delusion: Symptoms, Causes, and Treatment Fregoli Syndrome

Out of so many mental disorders, a rare disorder is the Fregoli delusion or Fregoli syndrome (FS), in which an individual holds a delusional belief that different people are in fact a single person, who keeps on changing appearances quickly or is in disguise. People affected with this condition often experience anxiety, paranoia, and agitation. It can impact the patient’s mental health and their safety and the safety of others.

You will discover more about the syndrome as you read the following sections.

What is Fregoli Delusion or Fregoli Syndrome?

Fregoli delusion, also known as Fregoli syndrome (FS), is a rare mental disorder, in fact a delusional disorder, where the affected person strongly believes that a stranger is a known person who changes their appearance or is in disguise. (1) This condition has been named after a famous Italian actor, who was known for his impersonations and fast, on-stage costume changes.

In the Fregoli delusion, the patient feels as if they are in the audience, watching a play. Strangers change their costumes and voices, acting like someone else, hiding their true selves. Such delusions happen because the patients’ brain finds it difficult to identify people around them. This, in turn, causes anxiety, agitation, and paranoia.

Explore the Symptoms of Fregoli Delusion or Fregoli Syndrome

What are the features of Fregoli Delusion?

Some of the features of Fregoli syndrome, as per the patient, are:

  • A closed person changes their appearance or remains in disguise as a stranger.

  • The known person who is in disguise follows them.

  • The familiar person in disguise will harm them.

These features are known as delusions of misidentification. Such features make it pretty difficult to distinguish between a familiar person and a stranger.

What are the symptoms of Fregoli syndrome?

Apart from all the above features, with the prime one being that a stranger is someone the patient knows in disguise, some other symptoms of Fregoli syndrome are:

  • Difficulty falling asleep.

  • Memory loss

  • Hallucinations

  • Mild cognitive impairment.

Complications Associated with Fregoli Delusion or Fregoli Syndrome

Fregoli syndrome (FS) or Fregoli delusion is commonly associated with aggressive behavior and verbal threats. (2) The patient’s mental health and emotional well-being can be significantly impacted by Fregoli delusion. This can lead to aggressive behavior toward the misidentified person. Additionally, the affected person is also at a severe risk of experiencing suicidal thoughts.

Find Out the Causes of Fregoli Delusion or Fregoli Syndrome

Some of the causes of Fregoli Delusion or Fregoli Syndrome (FS) include:

Infectious and Environmental Causes

The exact cause of Fregoli delusion remains unknown; however, specific infectious agents and environmental factors are known to play a role in its occurrence. For instance, being exposed to neurotoxins or other substances that affect brain function may contribute to the development of Fregoli syndrome.

Additionally, certain viral infections, such as encephalitis, known to affect the central nervous system, can cause alterations in

 cognition and perception.

Genetic and Autoimmune Causes

Although there is limited evidence to suggest a hereditary component to Fregoli delusion, specific studies indicate that individuals with a family history of psychiatric disorders are at a higher risk of developing this syndrome.

Lupus, multiple sclerosis, or other autoimmune conditions that affect the brain may contribute to the onset of Fregoli syndrome.

Lifestyle and Dietary Factors

Substance abuse, chronic stress, poor nutrition, and similar lifestyle factors can cause mental health decline and may raise the risk of developing psychiatric conditions, including Fregoli delusion.

A diet that lacks essential nutrients, especially those that support brain health, can also lead to the onset of Fregoli delusion.

Key Risk Factors

Some of the key risk factors include:

Age: Fregoli syndrome is more commonly reported in adults. However, it can occur at any age.

Gender: According to some studies, Fregoli syndrome is highly prevalent in males.

Underlying Conditions: People with a history of psychiatric disorders, traumatic brain injuries, or neurological conditions are more likely to develop Fregoli delusion.

Diagnosis and Tests for Fregoli Delusion or Fregoli Syndrome

Clinical Evaluation

A thorough clinical evaluation is essential before diagnostic tests. Doctors take a detailed patient history, including any neurological or psychiatric conditions, and perform a physical examination to assess their overall health.

Diagnostic Tests

There are no specific tests for Fregoli delusion. However, healthcare providers may use several diagnostic tools to rule out other conditions. These tests may include:

Laboratory Tests: These include blood tests to check for infection, substance abuse, or metabolic disorders.

Imaging Studies: Imaging studies for Fregoli syndrome include MRI or CT scans that identify any structural abnormalities in the brain.

Psychological Assessment: Psychological assessment is done by standardized questionnaires and interviews to evaluate the overall mental health status.

Treatments for Fregoli Delusion or Fregoli Syndrome

You have to go through a combination of the following to manage the symptoms of Fregoli syndrome.

Medical Treatments

Some of the common medical treatments for Fregoli delusion or Fregoli syndrome are:

Antipsychotic Medications: These medicines help manage delusions and reduce symptoms of Fregoli delusion. Some examples of antipsychotic medications are olanzapine and risperidone.

Antidepressants: Sometimes depression could be a contributing factor to experiencing Fregoli syndrome. In such cases, antidepressants or the selective serotonin reuptake inhibitors (SSRIs) may be beneficial.

Mood Stabilizers: Mood stabilizers like lithium may be prescribed if mood disorders are present in the patient.

Non-Pharmacological Treatments

Some of the non-pharmacological treatments that can help manage symptoms of Fregoli syndrome are:

Cognitive Behavioral Therapy (CBT): CBT helps people challenge and change their distorted beliefs and enhance their coping strategies.

Lifestyle Modifications: Following a healthy diet, regular exercise, and stress management techniques can significantly improve overall mental health.

Support Groups: Connecting with others with similar symptoms of Fregoli delusion can offer emotional support and also reduce feelings of isolation.

Special Consideration

Based on the population or patients’ age-group, treatment approaches for Fregoli delusion or Fregoli syndrome may vary.

Pediatric: Children with Fregoli delusions may require specialized therapeutic approaches that consider their developmental stage.

Geriatric: Older adults with Fregoli syndrome have different medication sensitives and they may have tailored treatment plans for their condition.

What is the Outlook for Fregoli Delusion or Fregoli Syndrome

Symptoms may decrease over time as the patient learns coping and management strategies. Many individuals experience a positive outlook when they follow their prescribed treatment plan.

NOTE: Symptoms appear when the patient stops taking prescribed medications.

Bottom Line

People enjoy watching a theatrical performance. However, when you know that it is not just an enjoyable experience, but a mental disorder when you are dealing with anxiety, paranoia, and other symptoms, you start looking for ways to get rid of the same. Fregoli syndrome or Fregoli delusion can be managed well if you get professional help from a healthcare provider quite early and follow the recommended treatment options.

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References & Research

  1. Bate, Sarah (2017-09-09). Face Recognition and its Disorders. Bloomsbury Publishing. p. 72. ISBN 978-1-137-29277-3.
  2. Ashraf N, Antonius D, Sinkman A, Kleinhaus K, Malaspina D. Fregoli syndrome: an underrecognized risk factor for aggression in treatment settings. Case Rep Psychiatry. 2011;2011:351824. doi: 10.1155/2011/351824. Epub 2011 Jul 14. PMID: 22937404; PMCID: PMC3420669.
  3. Fregoli Syndrome: An Underrecognized Risk Factor for Aggression in Treatment Settings - PMC

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