What is the appropriate work‑up and management for a patient presenting with functional neurological symptom disorder (historically called hysteria)?

Functional Neurological Disorder (FND) - Work-up and Management

Diagnose FND using positive clinical signs of symptom-disease incompatibility during neurological examination, not as a diagnosis of exclusion, and immediately initiate multidisciplinary rehabilitation centered on occupational therapy, physiotherapy for motor symptoms, and psychological therapy for dissociative seizures 1.

Diagnostic Approach

Key Clinical Features to Identify

FND presents with altered voluntary motor or sensory function that demonstrates clinical incompatibility with recognized neurological conditions 1. Look for these specific positive signs during examination:

• Functional weakness: Hoover's sign, give-way weakness, inconsistent strength on repeated testing
• Functional movement disorders: Tremor with distractibility, entrainment with rhythmic movements, sudden onset/offset
• Dissociative seizures: Episodes without EEG changes, eyes typically closed during events, prolonged duration, side-to-side head movements
• Functional gait disorders: Excessive slowness, bizarre posturing, improvement with distraction

Critical history elements include sudden symptom onset, intermittent time course, variability over time, and presence of other somatic symptoms 2. However, do not require psychological stressors or psychiatric history to make the diagnosis - these are neither necessary nor sufficient 2.

Investigation Strategy

Maintain a low threshold for investigating potential comorbid neurological conditions on initial presentation, especially with acute symptoms or diagnostic uncertainty 3. However, avoid repetitive testing that reinforces illness behavior 3. The diagnosis is made on positive clinical signs, not by excluding other conditions 4.

Management Algorithm

Immediate Actions (Emergency/Acute Setting)

1. Communicate the diagnosis clearly and confidently using consistent, respectful language 3
2. Validate symptoms as real - explain these are genuine neurological symptoms, not imagined 3
3. Create calm environment to reduce stress and symptom exacerbation 3
4. Prevent iatrogenic harm by avoiding unnecessary admissions and interventions 1

Core Treatment Framework

Base all treatment on a biopsychosocial framework with three central components 1:

1. Patient Education

Explain that FND involves dysfunction in how the brain controls movement and sensation, not structural damage. This reframes the condition as treatable and removes stigma.

2. Functional Rehabilitation (Primary for Motor Symptoms)

For functional weakness and movement disorders, occupational therapy is the cornerstone 1:

• Retrain normal movement within functional activities (not isolated exercises)
• Graded reintroduction to daily activities with structure and routine
• Focus on automatic movement rather than conscious control
• Reduce practical assistance gradually to encourage independence
• Address contributing factors: fatigue, pain, anxiety, poor sleep 1

For functional visual impairment: Help patients understand the diagnosis and positively reinforce when they use visual information automatically (avoiding obstacles, picking up objects) 1.

3. Psychological Therapy (Primary for Dissociative Seizures)

For dissociative seizures, psychological therapy is the main evidence-based treatment 1. This represents a critical therapeutic divergence - motor symptoms receive physical rehabilitation while seizures receive psychological intervention 5.

Specific strategies for dissociative seizures 1:

• Develop a seizure action plan (safe space, reassurance without constant attention, no physical restraint)
• Identify triggers and warning signs
• Teach sensory grounding techniques to prevent dissociation: noticing environmental details (colors, textures, sounds), cognitive distractions (word games, counting backwards), sensory distractors (rubber band on wrist, textured items)

Self-Management Strategies

Teach patients to:

• Establish daily structure and routine with written plans
• Take scheduled relaxation time
• Avoid over-attending to symptoms (trying too hard makes symptoms worse) 1
• Use calendars and alarms normally but avoid dependence
• Manage anxiety through recognition of somatic symptoms (racing heart, tight chest) 1

Critical Pitfalls to Avoid

• Do NOT present FND as a diagnosis of exclusion - this undermines patient confidence and delays treatment 4, 2
• Do NOT require psychiatric explanation - FND is diagnosed on neurological signs alone 2
• Do NOT use standard neurorehabilitation approaches designed for structural lesions - FND requires specific techniques 1
• Do NOT allow repeated ED visits and admissions for dissociative seizures - these are distressing and unnecessary 1
• Do NOT dismiss or minimize symptoms - validation is essential for engagement 3

Prognosis Factors

Early diagnosis and treatment initiation are the strongest prognostic factors 2. Symptom duration correlates with worse outcomes, making prompt recognition critical. The majority of patients experience diagnostic delays that worsen prognosis 2.