Conversion disorder

Conversion disorder, also known as functional neurological symptom disorder (FND), is a psychiatric condition characterized by neurological symptoms that cannot be fully explained by recognized neurological or medical diseases. Patients present with symptoms affecting voluntary motor or sensory function, resulting in significant distress, impairment in daily functioning, or the need for medical evaluation.

The symptoms are genuine and are not intentionally produced or feigned. Conversion disorder is thought to arise from complex interactions between psychological, biological, and social factors. The condition often presents in primary care, emergency, neurology, and mental health settings and requires careful assessment to exclude underlying neurological disease.

Epidemiology

Conversion disorder occurs in both children and adults but is more commonly diagnosed in adolescents and young adults. Females are affected more frequently than males.

The disorder is often associated with psychological stressors, trauma, anxiety disorders, depressive disorders, and other psychiatric conditions. It is commonly encountered in neurological practice because symptoms frequently resemble neurological diseases.

Risk Factors

Psychological Risk Factors

• Anxiety disorders

• Depressive disorders

• History of psychological trauma

• Emotional stress

• Maladaptive coping mechanisms

• Personality disorders

Social Risk Factors

• Family conflict

• Interpersonal difficulties

• Occupational stress

• Academic stress

• Social adversity

Medical and Neurological Risk Factors

• Previous neurological illness

• Chronic medical conditions

• History of physical injury

• Coexisting psychiatric disorders

Pathophysiology

The exact pathophysiology of conversion disorder is not fully understood. Current evidence suggests abnormalities in brain networks involved in emotion regulation, attention, self-awareness, and motor or sensory control.

Psychological distress may be unconsciously expressed as physical symptoms. Neuroimaging studies suggest altered communication between brain regions responsible for emotional processing and voluntary motor or sensory functions.

The symptoms are involuntary and reflect functional abnormalities rather than structural neurological damage.

Clinical Presentation

Symptoms may develop suddenly or gradually and often resemble neurological disorders.

Motor Symptoms

• Weakness or paralysis

• Abnormal gait

• Tremors

• Involuntary movements

• Difficulty walking

• Limb weakness

• Speech difficulties

• Loss of voice (aphonia)

Sensory Symptoms

• Numbness

• Altered sensation

• Loss of touch sensation

• Visual disturbances

• Blindness

• Hearing disturbances

Seizure-Like Symptoms

• Psychogenic non-epileptic seizures

• Episodes resembling epileptic seizures without corresponding neurological abnormalities

Associated Psychological Features

• Anxiety

• Depression

• Emotional distress

• Excessive concern about symptoms

• Functional impairment

DSM-5 Diagnostic Criteria

According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), conversion disorder is diagnosed when the following criteria are met:

Criterion A

• One or more symptoms of altered voluntary motor or sensory function.

Criterion B

• Clinical findings provide evidence of incompatibility between the symptom and recognized neurological or medical conditions.

Criterion C

• The symptom or deficit is not better explained by another medical or mental disorder.

Criterion D

• The symptom or deficit causes clinically significant distress or impairment in social, occupational, or other important areas of functioning, or warrants medical evaluation.

Differential Diagnosis

Neurological Disorders

• Epilepsy

• Stroke

• Multiple sclerosis

• Parkinson disease

• Peripheral neuropathy

• Myasthenia gravis

• Brain tumors

Psychiatric Disorders

• Somatic symptom disorder

• Illness anxiety disorder

• Factitious disorder

• Major depressive disorder

• Anxiety disorders

• Dissociative disorders

Medical Conditions

• Metabolic disorders

• Endocrine disorders

• Autoimmune diseases

• Drug-induced neurological symptoms

Other Conditions

• Malingering

• Functional movement disorders

• Functional sensory disorders

Investigations

Investigations are performed primarily to exclude underlying neurological and medical disorders.

Clinical Assessment

• Detailed medical history

• Psychiatric history

• Neurological history

• Psychosocial assessment

• Mental status examination

Physical Examination

• Comprehensive neurological examination

• General physical examination

• Assessment of functional impairment

Laboratory Investigations

May include:

• Full blood count

• Blood glucose testing

• Thyroid function tests

• Electrolytes

• Other investigations guided by clinical findings

Neurological Investigations

When indicated:

• Electroencephalography (EEG)

• Computed tomography (CT) scan

• Magnetic resonance imaging (MRI)

• Nerve conduction studies

Positive clinical findings demonstrating inconsistency or incongruence with recognized neurological disorders support the diagnosis.

Management

Management aims to improve functioning, reduce symptoms, address psychological factors, and prevent disability.

A strong therapeutic alliance is essential for successful treatment.

Non-pharmacological Treatment

Psychoeducation

Psychoeducation is a cornerstone of management.

The clinician should:

• Explain the diagnosis clearly and sensitively

• Emphasize that symptoms are genuine

• Reassure the patient that no serious neurological disease has been identified

• Encourage active participation in treatment

Cognitive Psychotherapy

Cognitive psychotherapy helps patients:

• Identify maladaptive thought patterns

• Address psychological stressors

• Develop healthier coping strategies

• Improve emotional regulation

• Reduce symptom-related anxiety

Additional Supportive Measures

Although not specifically required, supportive interventions may include:

• Stress management techniques

• Family support

• Occupational rehabilitation

• Social reintegration strategies

Pharmacological Treatment

Pharmacological treatment may be considered when symptoms are associated with depression, anxiety, or significant emotional distress.

Use one of the following:

• Amitriptyline (PO) 25–50 mg once daily. Medication should be titrated according to symptom resolution.

OR

• Imipramine (PO) 100 mg once daily. Medication should be titrated according to symptom resolution.

OR

• Fluoxetine (PO) 10–20 mg once daily. Medication should be titrated according to symptom resolution.

Principles of Pharmacological Treatment

• Medication should complement psychological interventions.

• Treatment should be individualized.

• The lowest effective dose should be used.

• Symptoms and adverse effects should be monitored regularly.

• Coexisting psychiatric disorders should be identified and treated appropriately.

Management According to Severity

Mild Symptoms

• Psychoeducation

• Regular follow-up

• Cognitive psychotherapy

• Stress management

Moderate Symptoms

• Structured psychotherapy

• Functional rehabilitation

• Pharmacological treatment when indicated

• Social and occupational support

Severe Symptoms

• Multidisciplinary management

• Intensive psychological intervention

• Specialist psychiatric assessment

• Neurological follow-up where required

Referral

Refer the patient when:

• Diagnostic uncertainty exists

• Symptoms are severe or disabling

• Specialist neurological assessment is required

• Significant psychiatric comorbidity is present

• Symptoms persist despite treatment

• Functional impairment is substantial

Complications

Psychological Complications

• Anxiety disorders

• Depressive disorders

• Chronic distress

• Reduced quality of life

Functional Complications

• Social withdrawal

• Occupational impairment

• Academic difficulties

• Dependency on caregivers

Healthcare-Related Complications

• Excessive healthcare utilization

• Repeated unnecessary investigations

• Polypharmacy

Prognosis

The prognosis varies depending on symptom duration, severity, psychiatric comorbidity, treatment engagement, and psychosocial circumstances.

Patients with early diagnosis, good insight, and timely intervention generally have better outcomes. Chronic symptoms, significant psychiatric comorbidity, and prolonged disability may be associated with poorer prognosis.

Prevention

Although conversion disorder cannot always be prevented, the following strategies may reduce long-term disability:

• Early identification of symptoms

• Prompt assessment and diagnosis

• Effective management of psychological stress

• Treatment of anxiety and depressive disorders

• Strengthening social support systems

• Early psychological intervention

Special Considerations

• Symptoms are genuine and should never be considered intentionally produced.

• Conversion disorder is diagnosed based on positive clinical findings and not solely by exclusion.

• Careful neurological assessment is required before establishing the diagnosis.

• Psychoeducation is one of the most important components of treatment.

• Cognitive psychotherapy remains a key therapeutic intervention.

• Management should focus on improving function and quality of life rather than solely eliminating symptoms.