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# Functional neurological symptom disorder (conversion disorder)

Real neurological symptoms such as weakness, numbness or seizure-like attacks caused by a problem in how the brain works, not by structural damage.

Updated 2026-11-01

## Structures involved

Tap one to see what it is and open it in 3D.

- [Frontal lobe](https://durgical.com/en/anatomy/superior-frontal-gyrus/)
- [Parietal lobe](https://durgical.com/en/anatomy/superior-parietal-lobule/)
- [Motor cortex](https://durgical.com/en/anatomy/precentral-gyrus/)
- [Cingulate gyrus](https://durgical.com/en/anatomy/cingulate-gyrus/)
- [Insula](https://durgical.com/en/anatomy/insula/)
- [Amygdala](https://durgical.com/en/anatomy/amygdaloid-body/)

## What it is

A condition in which a person has genuine, involuntary neurological symptoms (weakness, abnormal movements, sensory loss, non-epileptic attacks, speech or visual problems) whose pattern is incompatible with recognised structural neurological disease. The symptoms are not feigned. Diagnosis rests on positive clinical signs of inconsistency, not merely on normal tests.

## Who gets it

One of the most common reasons for referral to neurology clinics worldwide, and frequent in emergency departments as functional weakness or non-epileptic attacks. More common in women and usually begins in adolescence or early adulthood. In Colombia and Latin America it is seen in general and emergency practice, often after stressful events and in settings with exposure to violence or displacement.

## Causes

- Altered brain processing of movement and sensation, with abnormal attention and expectation shaping the symptom
- Psychological stressors or trauma before onset in many, though not all, patients
- A physical trigger such as minor injury, infection, pain or a medical procedure
- Coexisting neurological disease (for example epilepsy) in a proportion of patients

## Risk factors

- Female sex and younger age
- History of childhood adversity, abuse or recent major stress
- Coexisting depression, anxiety, PTSD or dissociative symptoms
- Other functional disorders (chronic pain, irritable bowel, fibromyalgia)
- Neurological disease in the patient or a close model of illness in the family

## Pathophysiology

Functional imaging studies show altered activity and connectivity in networks that control voluntary movement, attention and the sense of agency (frontal, parietal, cingulate and limbic regions). Movements and sensations are generated without the usual feeling of voluntary control, so the patient truly experiences them as involuntary. Emotional networks such as the [amygdala](https://durgical.com/en/anatomy/amygdaloid-body/) appear to influence motor planning more than normal.

## Classification

- With weakness or paralysis
- With abnormal movement (tremor, dystonia, jerks, gait disorder)
- With swallowing or speech symptoms
- With attacks or seizures (functional or psychogenic non-epileptic seizures)
- With sensory loss, or with special sensory symptoms (visual, hearing)
- Acute episode (under 6 months) or persistent; with or without a psychological stressor

## Symptoms and signs

- Limb weakness or paralysis that does not follow a nerve or brain territory
- Tremor that changes frequency or stops with distraction
- Attacks with prolonged eye closure, side-to-side head movements, pelvic thrusting or long duration
- Numbness with sharp midline borders or loss of vision or hearing
- Gait that is unusual but rarely leads to falls with injury
- Unusual calm about the disability in some patients, which is not a reliable diagnostic sign

## Red flags

- Focal signs that fit a vascular territory with sudden onset (rule out stroke first)
- Objective signs such as reflex asymmetry, extensor plantar response, sphincter loss or papilloedema
- Attacks with [tongue](https://durgical.com/en/anatomy/tongue/) biting on the side, incontinence with injury, or post-ictal confusion (possible epileptic seizure)
- Suicidal thoughts or severe depression
- Rapidly worsening deficits or new symptoms in a patient with an established functional diagnosis

## Diagnosis

**Clinical**
A positive diagnosis made by a clinician based on internal inconsistency on examination. Classic signs: Hoover sign (hip extension weakness that returns to normal when the opposite hip is flexed against resistance), hip abductor sign, tremor entrainment test, give-way weakness and drift without pronation. Ideally the attacks are captured on video.

**Tests**
Tests are used to exclude or identify coexisting disease, not to make the diagnosis: blood tests as clinically guided, nerve conduction studies when relevant, and video-EEG to distinguish functional from epileptic seizures (normal EEG during a typical attack, no post-ictal slowing). Serum prolactin is sometimes used after a seizure-like event.

**Imaging**
Brain or spinal MRI when the presentation could be structural, mainly to exclude stroke, multiple sclerosis or a compressive lesion; it is expected to be normal or not to explain the symptoms.

## Differential diagnosis

- Stroke or transient ischaemic attack
- Epilepsy (epileptic seizures, sometimes coexisting)
- Multiple sclerosis and other demyelinating disease
- Factitious disorder and malingering (symptoms produced intentionally)
- Somatic symptom disorder
- Movement disorders such as primary dystonia

## Goal of treatment

Explain the diagnosis clearly and credibly, restore function through targeted rehabilitation, treat coexisting mental health problems and avoid unnecessary tests and treatments.

## Treatment

**Conservative**
Clear explanation of the diagnosis as a real, common and potentially reversible brain-function problem, showing the patient their positive signs

**Rehabilitation**
Specialised physiotherapy and occupational therapy that retrain movement using distraction and automatic movement

**Conservative**
Psychological therapy, mainly cognitive behavioural therapy, especially for functional seizures

**Medical**
Antidepressants (for example SSRIs) when depression or anxiety coexist; antiseizure drugs are tapered when attacks are purely functional

**Follow-up**
Nursing: safe environment during attacks, avoid restraint or painful stimuli, coordinated care with one main clinician and consistent messages

## Complications

- Long-term disability, deconditioning, contractures and loss of work or schooling
- Iatrogenic harm from unnecessary tests, procedures or drugs (for example intubation or high-intensity antiseizure treatment for functional seizures)
- Depression, anxiety and social isolation
- Missed coexisting organic disease if every new symptom is attributed to the functional disorder

## Prognosis

Variable. Short duration, early diagnosis, acceptance of the explanation and a clear trigger predict better recovery; long duration, older age and coexisting personality disorder predict persistence. Many patients improve substantially with rehabilitation.

## Test yourself

Think of the answer, then tap the question to see it.

## Which examination sign shows weakness of hip extension that recovers when the patient flexes the opposite hip against resistance?

The Hoover sign, a positive sign of functional leg weakness.

## Which test best distinguishes functional seizures from epileptic seizures?

Video-EEG recording of a typical attack.

## Is the patient consciously producing the symptoms in conversion disorder?

No; the symptoms are involuntary, unlike factitious disorder and malingering.

## What is the first-line treatment approach for functional weakness?

A clear explanation of the diagnosis plus specialised physiotherapy, with psychological therapy as needed.

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## Related conditions

- [Somatic symptom and illness anxiety disorders](https://durgical.com/en/conditions/somatic-symptom-and-illness-anxiety-disorders/)
- [Dissociative disorders](https://durgical.com/en/conditions/dissociative-disorders/)
- [Factitious disorder and malingering](https://durgical.com/en/conditions/factitious-disorder-and-malingering/)
- [Epilepsy and seizures](https://durgical.com/en/conditions/epilepsy-and-seizures/)
- [Multiple sclerosis](https://durgical.com/en/conditions/multiple-sclerosis/)
- [Ischaemic stroke](https://durgical.com/en/conditions/ischaemic-stroke/)
- [Post-traumatic stress disorder (PTSD) and acute stress disorder](https://durgical.com/en/conditions/post-traumatic-stress-disorder-and-acute-stress-disorder/)
- [Major depressive disorder](https://durgical.com/en/conditions/major-depressive-disorder/)

Educational information, not medical advice. For any symptom, see a health professional.

Sources: [Functional neurological disorder](https://medlineplus.gov/ency/article/000954.htm) (MedlinePlus (U.S. National Library of Medicine), 2025).

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Source: https://durgical.com/en/conditions/functional-neurological-symptom-disorder/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/conditions/functional-neurological-symptom-disorder/