Complex PTSD¶
TL;DR — ICD-11 complex PTSD (CPTSD) requires the PTSD core plus persistent disturbances in self-organisation: affect dysregulation, negative self-concept and relational disturbance (Maercker 2022, PMID 35780794) (Cloitre 2018, PMID 30178492). Latent-profile and factor studies across clinical, veteran and refugee samples often support distinguishable PTSD/CPTSD patterns (Karatzias 2017, PMID 27723542) (Vang 2019, PMID 31984942) (Folke 2021, PMID 34249244), but this does not yet establish distinct mechanisms or a different optimal treatment. The central practice question is treatment transportability, not whether complex trauma is ‘real.’
Definition¶
CPTSD is a sibling of ICD-11 PTSD, not ‘PTSD plus every comorbidity.’ DSO symptoms must be persistent and associated with impairment (Maercker 2022, PMID 35780794) (Cloitre 2018, PMID 30178492).
Evidence for distinction¶
Studies in treatment-seeking adults, refugees, military personnel and multiple countries frequently find profiles resembling PTSD and CPTSD (Karatzias 2017, PMID 27723542) (Folke 2021, PMID 34249244) (Vang 2019, PMID 31984942) (Kazlauskas 2018, PMID 33680347) (Hyland 2018, PMID 29868234). These are model-dependent classifications; alternative dimensional structures can also fit.
Exposure is probabilistic¶
Sustained interpersonal trauma is common among CPTSD cases, but trauma type does not mechanically determine diagnosis. Diagnosis rests on symptoms and impairment, not a hierarchy of deservingness (Maercker 2022, PMID 35780794).
Treatment controversy¶
The evidence base does not justify assuming that every person with CPTSD needs prolonged stabilisation before trauma-focused work. Component network evidence in complex-trauma populations supports benefit from psychological intervention but is heterogeneous (Coventry 2020, PMID 32813696). Across 51 RCTs whose participants were likely to have clinically significant levels of one or more CPTSD symptom clusters, CBT, exposure alone and EMDR all beat usual care on PTSD symptoms, with effects ranging from g=−0.90 for CBT (k=27; 95% CI −1.11 to −0.68; moderate quality) to g=−1.26 for EMDR (k=4; 95% CI −2.01 to −0.51; low quality) (Karatzias 2019, PMID 30857567). The most direct test of the sequencing assumption goes the other way: in patients with childhood-abuse-related PTSD, 54% of whom met CPTSD criteria at baseline, CPTSD status was associated with more severe symptoms and more comorbidity but neither predicted nor moderated outcome across three variants of exposure therapy (Hoeboer 2021, PMID 33831660).
Trials still rarely stratify by ITQ-defined CPTSD, and stating that precisely matters. As of a live search on 2026-09-02, the first randomised trial designed around the ICD-11 construct itself is a pilot: ESTAIR versus treatment as usual for ICD-11 CPTSD, with dropout of 18% versus 11%, large pre-to-post effects (ITQ PTSD d=1.78; DSO d=2.00) and probable-CPTSD diagnosis retained by 13.6% of the ESTAIR arm against 84% of TAU (Karatzias 2024, PMID 38688242). A pilot against usual care does not establish that a CPTSD-specific protocol outperforms standard trauma-focused therapy in ITQ-defined CPTSD; that comparison has not been run.
Borders¶
Borderline personality disorder, dissociative disorders, depression and PTSD share features but are not interchangeable. This page describes the ICD-11 construct; comorbid depression is cross-linked, not absorbed. Moral injury is a different construct and is treated separately (Currier 2021, PMID 33475402) (Griffin 2019, PMID 30688367).
Quantitative anchors¶
| Measure | Estimate | Population/method | Source |
|---|---|---|---|
| Population prevalence | 1–8% | Review range; methods heterogeneous | (Maercker 2022, PMID 35780794) |
| Mental-health settings | up to 50% | Review range; referral-enriched | (Maercker 2022, PMID 35780794) |
| ITQ | 12 items | PTSD + DSO domains | (Cloitre 2018, PMID 30178492) |
| UK ITQ development | n=1,051 community; n=247 clinical | Psychometric development | (Cloitre 2018, PMID 30178492) |
| Danish soldiers | n=294 | Treatment-seeking replication | (Folke 2021, PMID 34249244) |
| Refugee treatment sample | n=284 | Latent-class validation | (Vang 2019, PMID 31984942) |
| CPTSD-symptom RCT evidence base | 51 RCTs | CBT g=−0.90 (k=27); EMDR g=−1.26 (k=4) vs usual care | (Karatzias 2019, PMID 30857567) |
| CPTSD as outcome moderator | neither predicted nor moderated outcome | 54% met CPTSD criteria; childhood-abuse-related PTSD | (Hoeboer 2021, PMID 33831660) |
| ESTAIR vs TAU (pilot) | probable CPTSD retained by 13.6% vs 84% | ITQ-defined ICD-11 CPTSD; pilot RCT | (Karatzias 2024, PMID 38688242) |
Evidence ledger¶
The ledger lists the live-retrieved records used to bound this page. Inclusion does not make every record equally probative; design, population and comparator remain decisive.
| PMID | Year | Evidence contribution | Scope caution |
|---|---|---|---|
| 35780794 | 2022 | Complex post-traumatic stress disorder. | PTSD-specific record; inspect design and population |
| 30178492 | 2018 | The International Trauma Questionnaire: development of a self-report measure of ICD-11 PTSD and complex PTSD. | PTSD-specific record; inspect design and population |
| 29029837 | 2017 | A review of current evidence regarding the ICD-11 proposals for diagnosing PTSD and complex PTSD. | Synthesis: preserve included-population and certainty limits |
| 27723542 | 2017 | Evidence of distinct profiles of Posttraumatic Stress Disorder (PTSD) and Complex Posttraumatic Stress Disorder (CPTSD) based on the new ICD-11 Trauma Questionnaire (ICD-TQ). | PTSD-specific record; inspect design and population |
| 34249244 | 2021 | PTSD and complex PTSD in treatment-seeking Danish soldiers: a replication of Folke et al. (2019) using the International Trauma Questionnaire. | PTSD-specific record; inspect design and population |
| 31984942 | 2019 | Testing the validity of ICD-11 PTSD and CPTSD among refugees in treatment using latent class analysis. | PTSD-specific record; inspect design and population |
| 33680347 | 2018 | The structure of ICD-11 PTSD and complex PTSD in Lithuanian mental health services. | PTSD-specific record; inspect design and population |
| 29868234 | 2018 | Are posttraumatic stress disorder (PTSD) and complex-PTSD distinguishable within a treatment-seeking sample of Syrian refugees living in Lebanon? | PTSD-specific record; inspect design and population |
| 32345416 | 2020 | ICD-11 complex post-traumatic stress disorder: simplifying diagnosis in trauma populations. | PTSD-specific record; inspect design and population |
| 33475402 | 2021 | Moral injury and ICD-11 complex PTSD (CPTSD) symptoms among treatment-seeking veterans in the United Kingdom. | PTSD-specific record; inspect design and population |
| 30688367 | 2019 | Moral Injury: An Integrative Review. | Synthesis: preserve included-population and certainty limits |
| 32813696 | 2020 | Psychological and pharmacological interventions for posttraumatic stress disorder and comorbid mental health problems following complex traumatic events: Systematic review and component network meta-analysis. | Synthesis: preserve included-population and certainty limits |
| 39213321 | 2024 | Childhood trauma, PTSD/CPTSD and chronic pain: A systematic review. | Synthesis: preserve included-population and certainty limits |
| 39539241 | 2024 | On the concordance between CAPS-5 and PCL-5 scores. | PTSD-specific record; inspect design and population |
| 40875537 | 2025 | N-Acetylcysteine for the Treatment of Co-Occurring Posttraumatic Stress Disorder and Alcohol Use Disorder: A Double-Blind, Randomized Controlled Trial. | PTSD-specific record; inspect design and population |
| 38225918 | 2024 | [Post-traumatic stress disorder (PTSD) and complex PTSD (CPTSD) - a clinical update of knowledge]. | PTSD-specific record; inspect design and population |
| 37355148 | 2023 | Equine-Assisted Therapy in Post-Traumatic-Stress Disorder: A Systematic Review and Meta-Analysis. | Synthesis: preserve included-population and certainty limits |
| 38032650 | 2024 | Asynchronous assessment with the PCL-5: Practice considerations and recommendations. | PTSD-specific record; inspect design and population |
| 32063234 | 2020 | Psychological treatments for post-traumatic stress disorder in adults: a network meta-analysis. | Synthesis: preserve included-population and certainty limits |
| 32284821 | 2020 | Psychological therapies for post-traumatic stress disorder in adults: systematic review and meta-analysis. | Synthesis: preserve included-population and certainty limits |
| 26574151 | 2016 | Psychological treatments for adults with posttraumatic stress disorder: A systematic review and meta-analysis. | Synthesis: preserve included-population and certainty limits |
| 34473342 | 2022 | Trauma-focused psychotherapies for post-traumatic stress disorder: A systematic review and network meta-analysis. | Synthesis: preserve included-population and certainty limits |
| 37141033 | 2023 | The efficacy and acceptability of psychological interventions for adult PTSD: A network and pairwise meta-analysis of randomized controlled trials. | Synthesis: preserve included-population and certainty limits |
| 38590124 | 2024 | Cognitive-behavioural conjoint therapy versus prolonged exposure for PTSD in military service members and veterans: results and lessons from a randomized controlled trial. | PTSD-specific record; inspect design and population |
| 28493729 | 2018 | The Clinician-Administered PTSD Scale for DSM-5 (CAPS-5): Development and initial psychometric evaluation in military veterans. | PTSD-specific record; inspect design and population |
| 30857567 | 2019 | Psychological interventions for ICD-11 complex PTSD symptoms: systematic review and meta-analysis. | Participants likely to have CPTSD symptoms; not ITQ-diagnosed |
| 33831660 | 2021 | Does complex PTSD predict or moderate treatment outcomes of three variants of exposure therapy? | Childhood-abuse-related PTSD only; needs replication |
| 38688242 | 2024 | Enhanced Skills Training in Affective and Interpersonal Regulation versus Treatment as Usual for ICD-11 Complex PTSD: A Pilot Randomised Controlled Trial (The RESTORE Trial). | Pilot; comparator is usual care, not active trauma-focused therapy |
Interpretation guardrails¶
- Trauma exposure, post-traumatic symptoms, acute stress disorder, DSM-5 PTSD, ICD-11 PTSD and ICD-11 complex PTSD are not interchangeable populations.
- A mixed-anxiety or transdiagnostic estimate is labelled as such; only a source’s PTSD stratum can be treated as a PTSD effect.
- Comorbid depression is measured separately and cross-linked to the depression condition; it is not absorbed into PTSD.
- Waitlist, treatment-as-usual, attention control and active treatment answer different causal questions.
- Registration, statistical significance and diagnostic loss do not respectively prove completion, clinical importance or functional recovery.
- This page synthesizes research and does not provide individual medical advice.
Minimum extraction frame for studies on this topic¶
| Field | What must be retained | Why it changes interpretation |
|---|---|---|
| Diagnostic system | DSM version, ICD version, full/subthreshold | Case mix is not interchangeable |
| Diagnostic method | Structured interview, clinician judgment, self-report cutoff | Screening is not diagnosis |
| Index trauma | Type, timing, repetition, direct/indirect/occupational | Conditional risk and phenotype differ |
| Population | Civilian, veteran, refugee, child/adolescent, mixed | Transportability is empirical |
| Baseline severity | Mean, SD, range and exclusion threshold | Ceiling and floor effects alter change |
| CPTSD status | ITQ/ICD-11 definition and DSO score | Complexity cannot be inferred from trauma count |
| Comorbidity | Depression, GAD, SUD, pain, TBI measured separately | Shared symptoms can distort effects |
| Comparator | Waitlist, usual care, attention, active treatment | The estimand changes with comparator |
| Treatment dose | Sessions offered/attended, duration, homework | Assignment is not exposure |
| Outcome | Symptoms, diagnosis, response, function, sleep | Outcomes are not interchangeable |
| Time point | End point and prespecified follow-up windows | Acute benefit may not persist |
| Missing data | Denominator, reasons, imputation and estimand | Attrition can bias rank and magnitude |
| Adverse events | Definitions, ascertainment and arm-level counts | Absence of reporting is not absence of harm |
| Therapist/context | Training, fidelity, allegiance, setting | Delivery is part of the intervention |
| Funding/conflicts | Sponsor role and analytic independence | Especially material for proprietary packages |
Claims this page does not make¶
- It does not infer PTSD from trauma exposure alone.
- It does not treat a self-report cutoff as equivalent to a structured diagnosis.
- It does not convert a pooled anxiety-disorder effect into a PTSD effect.
- It does not convert a depression outcome in a comorbid sample into a PTSD outcome.
- It does not infer superiority from a statistically significant within-group change.
- It does not infer equivalence from a non-significant between-group test.
- It does not infer effectiveness from trial registration or mechanistic plausibility.
- It does not assume military, civilian, refugee and pediatric estimates transport unchanged.
- It does not average conflicting estimates that use different definitions.
- It does not treat lack of adverse-event reporting as evidence of safety.
Evidence-updating triggers¶
| Trigger | Required response |
|---|---|
| New diagnostic revision | Recalculate which populations prior estimates represent |
| New head-to-head RCT | Compare against active treatment, not only waitlist |
| New individual-participant synthesis | Revisit effect modifiers and transportability |
| Registry status change | Verify results and linked publication before changing conclusions |
| Guideline update | Separate evidence review from panel recommendation |
| Regulatory decision | Record decision date and source; do not infer from efficacy papers |
| Safety signal | Re-extract denominator, ascertainment and exposure time by arm |
| Contradictory replication | Display estimates side by side; do not average definitions |
Evidence updates should preserve the prior estimate and explain why the new study changes—or does not change—the inference.
Open questions¶
- Does ITQ-defined CPTSD moderate benefit or harm from immediate trauma-focused therapy versus phase-based care? (Cloitre 2018, PMID 30178492) (Coventry 2020, PMID 32813696)
- Are categorical CPTSD and dimensional DSO scores equally predictive of functioning and course? (Karatzias 2017, PMID 27723542)
- Which findings replicate outside high-income clinical services and forced-displacement samples? (Vang 2019, PMID 31984942) (Hyland 2018, PMID 29868234)
Related pages¶
- diagnosis-and-classification — DSM/ICD divergence and instruments.
- comorbidity — adjacent diagnoses.
- moral-injury — related but non-equivalent construct.
- comparative-psychotherapy-evidence — treatment transportability.
References¶
- Maercker A, et al. Complex post-traumatic stress disorder. Lancet. 2022;400(10345):60-72. PMID 35780794
- Cloitre M, et al. The International Trauma Questionnaire: development of a self-report measure of ICD-11 PTSD and complex PTSD. Acta Psychiatr Scand. 2018;138(6):536-546. PMID 30178492
- Brewin CR, et al. A review of current evidence regarding the ICD-11 proposals for diagnosing PTSD and complex PTSD. Clin Psychol Rev. 2017;58:1-15. PMID 29029837
- Karatzias T, et al. Evidence of distinct profiles of Posttraumatic Stress Disorder (PTSD) and Complex Posttraumatic Stress Disorder (CPTSD) based on the new ICD-11 Trauma Questionnaire (ICD-TQ). J Affect Disord. 2017;207:181-187. PMID 27723542
- Folke S, et al. PTSD and complex PTSD in treatment-seeking Danish soldiers: a replication of Folke et al. (2019) using the International Trauma Questionnaire. Eur J Psychotraumatol. 2021;12(1):1930703. PMID 34249244
- Vang ML, et al. Testing the validity of ICD-11 PTSD and CPTSD among refugees in treatment using latent class analysis. Torture. 2019;29(3):27-45. PMID 31984942
- Kazlauskas E, et al. The structure of ICD-11 PTSD and complex PTSD in Lithuanian mental health services. Eur J Psychotraumatol. 2018;9(1):1414559. PMID 33680347
- Hyland P, et al. Are posttraumatic stress disorder (PTSD) and complex-PTSD distinguishable within a treatment-seeking sample of Syrian refugees living in Lebanon? Glob Ment Health (Camb). 2018;5:e14. PMID 29868234
- Cloitre M ICD-11 complex post-traumatic stress disorder: simplifying diagnosis in trauma populations. Br J Psychiatry. 2020;216(3):129-131. PMID 32345416
- Currier JM, et al. Moral injury and ICD-11 complex PTSD (CPTSD) symptoms among treatment-seeking veterans in the United Kingdom. Psychol Trauma. 2021;13(4):417-421. PMID 33475402
- Griffin BJ, et al. Moral Injury: An Integrative Review. J Trauma Stress. 2019;32(3):350-362. PMID 30688367
- Coventry PA, et al. Psychological and pharmacological interventions for posttraumatic stress disorder and comorbid mental health problems following complex traumatic events: Systematic review and component network meta-analysis. PLoS Med. 2020;17(8):e1003262. PMID 32813696
- Karimov-Zwienenberg M, et al. Childhood trauma, PTSD/CPTSD and chronic pain: A systematic review. PLoS One. 2024;19(8):e0309332. PMID 39213321
- Lee DJ, et al. On the concordance between CAPS-5 and PCL-5 scores. Eur J Psychotraumatol. 2024;15(1):2407728. PMID 39539241
- Back SE, et al. N-Acetylcysteine for the Treatment of Co-Occurring Posttraumatic Stress Disorder and Alcohol Use Disorder: A Double-Blind, Randomized Controlled Trial. J Clin Psychiatry. 2025;86(4):25m15803. PMID 40875537
- Bäärnhielm S, et al. [Post-traumatic stress disorder (PTSD) and complex PTSD (CPTSD) - a clinical update of knowledge]. Lakartidningen. 2024;121:23090. PMID 38225918
- Palomar-Ciria N, et al. Equine-Assisted Therapy in Post-Traumatic-Stress Disorder: A Systematic Review and Meta-Analysis. J Equine Vet Sci. 2023;128:104871. PMID 37355148
- Taylor LS, et al. Asynchronous assessment with the PCL-5: Practice considerations and recommendations. Psychol Serv. 2024;21(3):552-559. PMID 38032650
- Mavranezouli I, et al. Psychological treatments for post-traumatic stress disorder in adults: a network meta-analysis. Psychol Med. 2020;50(4):542-555. PMID 32063234
- Lewis C, et al. Psychological therapies for post-traumatic stress disorder in adults: systematic review and meta-analysis. Eur J Psychotraumatol. 2020;11(1):1729633. PMID 32284821
- Cusack K, et al. Psychological treatments for adults with posttraumatic stress disorder: A systematic review and meta-analysis. Clin Psychol Rev. 2016;43:128-41. PMID 26574151
- Jericho B, et al. Trauma-focused psychotherapies for post-traumatic stress disorder: A systematic review and network meta-analysis. Acta Psychiatr Scand. 2022;145(2):132-155. PMID 34473342
- Hoppen TH, et al. The efficacy and acceptability of psychological interventions for adult PTSD: A network and pairwise meta-analysis of randomized controlled trials. J Consult Clin Psychol. 2023;91(8):445-461. PMID 37141033
- Monson CM, et al. Cognitive-behavioural conjoint therapy versus prolonged exposure for PTSD in military service members and veterans: results and lessons from a randomized controlled trial. Eur J Psychotraumatol. 2024;15(1):2330305. PMID 38590124
- Weathers FW, et al. The Clinician-Administered PTSD Scale for DSM-5 (CAPS-5): Development and initial psychometric evaluation in military veterans. Psychol Assess. 2018;30(3):383-395. PMID 28493729
- Karatzias T, et al. Psychological interventions for ICD-11 complex PTSD symptoms: systematic review and meta-analysis. Psychol Med. 2019;49(11):1761-1775. PMID 30857567
- Hoeboer CM, et al. Does complex PTSD predict or moderate treatment outcomes of three variants of exposure therapy? J Anxiety Disord. 2021;80:102388. PMID 33831660
- Karatzias T, et al. Enhanced Skills Training in Affective and Interpersonal Regulation versus Treatment as Usual for ICD-11 Complex PTSD: A Pilot Randomised Controlled Trial (The RESTORE Trial). Psychother Psychosom. 2024;93(3):203-215. PMID 38688242