ICD-116C20	BODILY DISTRESS DISORDER Bodily distress disorder
ICD-10F45.0	Somatization disorder
DSM-5-TRF45.1	Somatic Symptom Disorder

1. Definition and nosology

ICD-11: 6C20 Bodily Distress Disorder; DSM-5-TR: F45.1 Somatic Symptom Disorder — a psychiatric disorder characterized by excessive focus, worry, and behavioral interference created by somatic complaints (pain, fatigue, gastrointestinal or cardiopulmonary symptoms), accompanied by functional impairment. Clinical diagnosis is made not on the ‘inexplicability’ of symptoms, but on persistent preoccupation and distress (major change in DSM-5-TR update).

2. History

• Briquet P. (1859) — “hysteria” with multiple somatic symptoms.
• DSM-III (1980) — “Somatoform Disorders” group.
• DSM-5 (2013) — Fundamental change: requirement for “medically unexplained symptoms” removed; whether the somatic symptom is real or not is not a criterion — the patient's reaction is the diagnostic focus.
• ICD-11 (2019) — “Bodily Distress Disorder” — based on the European model on bodily distress (Fink P., Schröder A.).

3. Epidemiology

• In primary care: 5–15%.
• Sex: 2–3 times higher in females.
• Comorbidity: MDD, anxiety, panic, factitious, real medical illnesses.
• High healthcare utilization and costs.

4. Aetiology and pathogenesis

• Biopsychosocial model — biological vulnerability + cognitive-affective emotional components + social reinforcement.
• Trauma and childhood illness history.
• Cognitive — catastrophizing and hypervigilance to bodily sensations.

5. Clinical features

• Persistent somatic symptoms (pain, fatigue, gastrointestinal, cardiopulmonary).
• ≥ 1 of the following:
  • Excessive and persistent thoughts about the severity of symptoms;
  • High anxiety about health;
  • Excessive time and energy devoted to symptoms.
• Duration ≥ 6 months.
• Functional impairment.
• “Doctor shopping”, repeated checking, avoidance behavior.

6. Diagnosis

6.1 Unified diagnostic criteria

A. One or more somatic symptoms — causing distress or functional impairment to the patient.

B. ≥ 1 of the following:

1. Excessive thoughts about the severity of symptoms;
2. High anxiety about health;
3. Excessive time/energy on symptoms.

C. Persistence ≥ 6 months.

6.2 Source-specific clarifications

• DSM-5-TR — “with predominant pain” and severity specifiers.
• ICD-11 — ‘Bodily Distress Disorder’ — close to the European ‘bodily distress syndrome’ concept (Fink P.); severity (mild, moderate, severe).
• German S3 Guideline (Funktionelle Körperbeschwerden, 2018) — biopsychosocial approach.

6.3 Diagnostic algorithm

1. Clinical interview.
2. PHQ-15 (somatic symptom scale), SSS-8.
3. Medical assessment — exclusion of somatic illness (but avoid excessive testing).
4. Comorbidity (MDD, anxiety, factitious, real illnesses).

6.4 Differential diagnosis

7. Examination and assessment

• PHQ-15, SSS-8, Whiteley Index (overlap).
• One-time comprehensive medical examination; then minimal repetition.
• Comorbidity scales.

8. Treatment

1. Biopsychosocial approach and stepped care — primary care physician at the centre, psychiatrist/psychologist adjunct.
2. Single physician model (single physician approach) — all complaints are managed through that physician.
3. CBT — cognitive restructuring, reduction of catastrophic interpretation of bodily sensations, behavioral activation. Evidence: van Dessel N. Cochrane 2014 (CD011142).
4. SSRI — for comorbid MDD/anxiety; duloxetine, amitriptyline when pain is dominant.
5. Structured limited checking — once comprehensive examination of the patient, then limited ‘reassurance’.
6. Mindfulness, physical activity, occupational rehabilitation.

Source-specific specifications

• German S3 Guideline — integrate care at the primary care level.
• NICE — no separate guideline for somatic symptom disorder; general principles.

Treatment methods

1. CBT for Somatic Symptom — Cognitive restructuring + behavioral intervention (avoidance reduction, exposure). van Dessel N. Cochrane 2014 (CD011142).
2. Single Physician Model — Structured visit; limited number of checks; sequential explanation.
3. PHQ-15, SSS-8 — Somatic complaint scales.
4. Stepped Care — CBT-based brief intervention at the primary care level; then specialized service.

9. Prognosis

• CBT and a multidisciplinary approach lead to significant improvement; chronic course.

10. Myths and misconceptions

Myth 1: “The patient is ‘faking’ symptoms”

Evidence: symptoms are real for the patient; somatic disorder is a clinical condition, not simulation.

Myth 2: “Saying ‘nothing is wrong’ after a medical exam will reassure the patient”

Evidence: Negative reassurance is short-term; maintains long-term anxiety. Structured explanation and biopsychosocial model are superior.

Myth 3: “Only a prolonged medical investigation will reveal the diagnosis”

Evidence: repeated checking increases somatic focus and costs; one-time comprehensive assessment, then limited.

Myth 4: “Somatic symptom disorder is only a ‘mental illness’”

Evidence: biopsychosocial disorder; biological components (sensory sensitivity, gut-brain axis) are real.

Myth 5: “Antidepressant is the ‘treatment’ for somatic symptom disorder”

Evidence: SSRI for comorbid symptoms; CBT first-line.

11. Sources

1. WHO. ICD-11. 6C20 Bodily distress disorder. 2024.
2. APA. DSM-5-TR. 2022.
3. Kleinstäuber M. et al. Pharmacological interventions for somatoform disorders in adults. Cochrane Database Syst Rev 2014;(11):CD010628.
4. Henningsen P. et al. Management of somatic symptom disorder. Dialogues Clin Neurosci 2018;20(1):23–31.
5. Schaefert R. et al. Non-specific, functional, and somatoform bodily complaints. Dtsch Arztebl Int 2012;109(47):803–813.
6. van Dessel N., den Boeft M., van der Wouden J.C. et al. Non-pharmacological interventions for somatoform disorders and medically unexplained physical symptoms (MUPS) in adults. Cochrane Database Syst Rev 2014;(11):CD011142.