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Functional Neurological Disorder (FND)

Conversion Disorder and Psychogenic Neurological Symptoms

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

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What is Functional Neurological Disorder (FND)?

Functional neurological disorder (FND), historically known as conversion disorder, hysteria, psychogenic neurological symptoms, is the second most common neurological diagnosis in outpatient clinics.

DSM-5 criteria: one or more symptoms of altered voluntary motor or sensory function with clinical findings showing incompatibility with neurological disease, causing significant distress or impairment.

Symptoms are real and disabling, not feigned (factitious disorder/malingering excluded).

Neurobiological model: aberrant top-down attentional and predictive processing, abnormal sense of agency, dysfunctional default mode network connectivity.

Prevalence: 4-12 per 100,000; female-to-male ratio 2-4:1; peak age 35-50 years (varies by symptom).

Subtypes: functional motor disorders (weakness, gait, tremor, dystonia), functional seizures (psychogenic non-epileptic seizures, PNES), functional sensory symptoms, functional cognitive symptoms, functional movement disorders.

Symptoms

Functional limb weakness (Hoover sign positive, give-way weakness, inconsistent strength).
Functional gait disorders: dragging, knee buckling, walking on ice (pseudoataxia), tightrope gait.
Functional tremor: variability with attention, distractibility, entrainment to external rhythm.
Functional seizures (PNES): convulsive (asymmetric thrashing, eyes closed, prolonged duration, pelvic thrusting); side-to-side head movement.
Functional sensory symptoms: anesthesia in non-anatomical distribution, splitting of vibration sense at midline.
Functional cognitive symptoms: severe self-described memory deficits, normal objective testing.
Functional speech disorders: stuttering, foreign accent syndrome, mutism.
Functional facial movements: hemifacial spasm, jaw deviation.
La belle indifférence (calm despite severe symptoms): historical association, not specific.
Symptoms often improve with distraction or worsen with attention.
Variability and inconsistency of symptoms over time.

Risk Factors

Female sex (most common).
Younger to middle age (peak 35-50 years).
Childhood adversity (physical, sexual, emotional abuse, neglect).
Recent psychological stressor or trauma.
Comorbid psychiatric conditions: depression, anxiety, PTSD, personality disorders.
Other chronic medical conditions, especially neurological (multiple sclerosis, epilepsy, migraine).
Family history of FND.
Healthcare worker (occupational exposure to neurological symptoms).
Personality traits: alexithymia, suggestibility, dissociation.

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • New neurological symptoms requiring evaluation.
  • Symptoms inconsistent with structural neurological disease on imaging.
  • Multiple unexplained neurological symptoms.
  • Sudden onset of neurological symptoms after psychological stressor.
  • Concurrent psychiatric symptoms with neurological complaints.
  • Failed treatment response to standard therapies for presumed structural disease.
  • Functional symptoms following actual neurological event (e.g., stroke, seizure).

Treatment Methods

01
Diagnostic approach: positive clinical signs (Hoover, give-way weakness, distractibility, entrainment), MRI to exclude structural disease, EEG for seizure differential.
02
Avoid 'rule out' approach: diagnosis based on positive findings, not exclusion of organic disease.
03
Communicate diagnosis clearly: 'functional' is preferred terminology over 'psychogenic' or 'conversion'.
04
Provide reassurance: symptoms are real, common, treatable; brain is healthy structurally but functionally altered.
05
Education: signposting to patient resources (e.g., neurosymptoms.org), explanation of brain-mind connection.
06
Multidisciplinary treatment: neurology, psychiatry, physiotherapy, occupational therapy, speech therapy.
07
Physiotherapy: specialized FND physiotherapy with retraining, distraction techniques, gradual rehabilitation.
08
Psychotherapy: cognitive behavioral therapy (CBT), trauma-focused therapy, mindfulness-based interventions.
09
Pharmacotherapy: SSRIs/SNRIs for comorbid depression/anxiety; avoid antiepileptics in PNES (no benefit).
10
Inpatient rehabilitation programs for severe disabling cases.
11
TMS (transcranial magnetic stimulation): emerging treatment for functional motor symptoms.
12
Outcomes: 50-60% improvement with appropriate multidisciplinary treatment within 1-2 years; chronicity in 30-40%.
13
Prognostic factors: shorter symptom duration, motivation, treatment engagement, absence of severe psychiatric comorbidity.
14
Long-term follow-up: regular reviews, addressing relapses, ongoing psychotherapy, family/social support.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.