Capgras Syndrome

Overview

Capgras syndrome is a rare condition in which a person believes that a loved one, friend, or even a pet has been replaced by an identical-looking impostor. It is not a separate disease but a symptom that can happen with certain brain or mental health conditions.

It is rare. Doctors do not know exactly how many people have it, but it is seen in a small number of people with certain brain conditions.

It can affect adults of any age, but it is more common in older adults with dementia. It also occurs in people with schizophrenia, Parkinson's disease, or after a brain injury.

Symptoms

Common symptoms

• Believing a partner, parent, child, or close friend has been replaced by an impostor.
• Feeling suspicious or fearful around the 'impostor.'
• Not being able to accept that the real person and the impostor are the same.
• The belief is strong even when others try to show it is not true.
• May act differently toward the real person, such as hiding things or being withdrawn.

Causes

Main causes

• Brain changes, such as from dementia or Alzheimer's disease
• Brain injury or damage, for example from a stroke or head injury
• Mental health conditions such as schizophrenia
• Some brain infections or conditions like epilepsy
• A side effect of certain medicines (always talk to a doctor before stopping any medicine)

Risk factors

• Older age, especially with dementia
• Having Parkinson's disease or another brain condition
• A history of mental health problems
• Brain surgery or seizures

When to see a doctor

See a doctor urgently if:

• If the person is in danger of hurting themselves or someone else, call your local emergency number right away
• If they become severely agitated or violent, seek immediate help

Book a routine appointment if:

• Make an appointment with a healthcare provider if the person has a false belief that a loved one is an impostor
• If the belief causes distress or disrupts daily life, a doctor can help find the cause

Diagnosis

A healthcare provider will talk with the person and their family, ask about symptoms, and review medical history. They will look for underlying causes such as dementia, mental health problems, or brain injury.

Tests that may be done

• Physical and neurological examination
• Memory, thinking, and orientation tests
• Brain imaging, such as CT or MRI, to look for damage or disease
• Blood tests to check for infections or other medical problems

What to expect at your appointment

The person may not agree that anything is wrong. A doctor is trained to ask questions in a respectful way. Family members can help by sharing what they have noticed and any past health history.

Treatment

Treatment for Capgras syndrome focuses on the underlying cause. For example, if dementia is causing it, treatment for dementia may help. If a mental health condition is present, therapy and support for that condition can make a difference. There is no one specific cure, but many people improve when the cause is managed.

Self-care at home

• For caregivers: stay calm and do not argue about the belief
• Reassure the person in a gentle way, without trying to convince them they are wrong
• Keep a familiar routine and surroundings
• Make sure the person takes any prescribed treatment and attends appointments
• Take care of your own wellbeing; caregiving can be stressful

Medical treatments

A doctor may recommend psychotherapy, such as supportive counseling, to help the person cope. Medications may be used to treat the underlying condition, such as dementia or schizophrenia, or to reduce distress and agitation. Medicines are always prescribed based on an individual assessment, and only a doctor or psychiatrist can decide what is appropriate. You should never give the person any medication without professional guidance.

When is surgery considered?

Surgery is not a treatment for Capgras syndrome.

Living with this condition

Living with Capgras syndrome can be confusing and sad for everyone. On a day-to-day basis, try to keep interactions gentle and positive. If the person is upset, try not to take it personally. Use their name, talk about shared memories, and let them lead the conversation. Sometimes, a short break and returning later can help.

Lifestyle tips

• Keep a calm, structured daily schedule
• Encourage physical activity, like short walks, if the person is able
• Maintain social contact with trusted people in familiar settings
• Avoid caffeine, alcohol, or anything that may increase agitation

Diet and exercise

A balanced diet with regular meals and plenty of fluids can help support overall brain health. If the person has diabetes, high blood pressure, or other conditions, managing those can also help. Light exercise, such as walking, may improve mood and sleep.

Mental health and emotional wellbeing

Capgras syndrome can be frightening for the person and painful for family members. It is normal to feel grief, frustration, or worry. If you or a loved one feel overwhelmed, talk to a healthcare provider or a counselor. If you are having thoughts of self-harm or crisis, please call your local emergency number or a mental health crisis line right away.

Prevention

Because Capgras syndrome is usually a symptom of another condition, there is no certain way to prevent it. Managing conditions like dementia, schizophrenia, or Parkinson's disease with the help of a healthcare team may reduce the risk or delay symptoms.

Vaccines

Vaccines are not used to prevent Capgras syndrome. Staying up to date on vaccinations for conditions that can affect the brain, like flu or pneumonia, may help avoid infections that could harm brain health. Talk to your doctor about recommended vaccines.

Screening programmes

There is no routine screening test for Capgras syndrome. If a person has risk factors like dementia or brain injury, monitoring for changes in thinking and perception is important.

Complications

If left untreated

• Ongoing distress and fear for the person
• Breakdown of trust and relationships with family and friends
• Caregiver exhaustion and burnout
• The person may isolate or avoid important care and support

Long-term outlook

The outlook depends on the cause. For people with dementia, the condition may come and go. For others, treating the underlying mental health or brain condition can greatly improve symptoms. Even when the belief does not completely go away, many people can live safely and comfortably with the right support and a compassionate approach.

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