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Functional Neurological Disorder (FND)

A neurologic condition characterized by genuine motor, sensory, or cognitive symptoms incompatible with recognized neurologic disease, diagnosed through positive clinical signs and managed with multidisciplinary biopsychosocial therapy.

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.

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What is Functional Neurological Disorder (FND)?

Functional neurological disorder (FND), historically called conversion disorder, is a clinical syndrome of motor, sensory, cognitive, or seizure-like symptoms that are genuine but incompatible with structural neurologic disease, supported by positive examination findings (e.g., Hoover's sign, tremor entrainment, dissociative seizure features).

Pathophysiology involves abnormal top-down attentional control, predictive coding errors, and altered self-agency in the brain, often modulated by stress, trauma, anxiety, or comorbid mental health conditions, but FND is not a diagnosis of exclusion or a sign of malingering.

Treatment is delivered by a multidisciplinary team and includes structured patient education emphasizing the brain-based nature of symptoms, specialized physiotherapy (retraining attention away from symptoms), occupational therapy, cognitive behavioral therapy, and management of co-occurring depression, anxiety, post-traumatic stress, or pain.

Symptoms

Functional limb weakness with positive Hoover's sign or hip abductor sign
Functional movement disorders: tremor with entrainment, dystonia, jerks, or gait disorders inconsistent with organic patterns
Functional or dissociative (psychogenic non-epileptic) seizures: long duration, asynchronous limb movements, eyes closed, side-to-side head shaking
Functional sensory loss not respecting dermatomes or anatomical pattern
Persistent dizziness, blurred vision, speech changes, swallowing difficulties without organic findings
Cognitive symptoms: brain fog, concentration difficulties, with normal objective testing

Risk Factors

Female sex, with peak incidence in young to middle adulthood
History of physical or psychological trauma (not always present)
Comorbid depression, anxiety, post-traumatic stress disorder, or chronic pain syndromes
Coexistent organic neurologic disease (e.g., epilepsy with dissociative seizures), which can complicate diagnosis
History of childhood adversity, although not in every patient
Medical or work-related stress and adverse life events

When to See a Doctor?

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

  • New onset neurologic symptoms with no clear organic cause after appropriate evaluation — referral to a neurologist with expertise in FND
  • Patient with established FND experiencing relapse, worsening, or new symptom — outpatient review
  • Acute deterioration with symptoms that mimic stroke or status epilepticus — emergency department evaluation to exclude organic emergencies
  • Dual diagnosis of epilepsy plus dissociative seizures — coordinated neurology and psychology care
  • Significant disability, depression, or risk of self-harm in a patient with FND — urgent multidisciplinary intervention

Treatment Methods

01
Positive diagnosis communicated clearly and respectfully, with explanation of the brain-based mechanism, ruling out malingering, and dispelling stigma
02
Specialist physiotherapy with movement retraining, attention diversion, and graded mobilization in functional motor symptoms
03
Cognitive behavioral therapy or trauma-focused therapy for selected patients, with attention to relevant precipitants and maintenance factors
04
Speech and language therapy for functional speech disturbance, occupational therapy for daily activity restoration, and pain management when applicable
05
Treatment of comorbid mental health conditions (depression, anxiety, post-traumatic stress disorder), structured follow-up, and long-term self-management strategies; specific therapy for functional seizures (psychotherapy and seizure-specific cognitive behavioral therapy)

Which Department to Visit?

You can visit our Nöroloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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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.