Complex PTSD: symptoms, causes and treatment

Key points

• Complex PTSD adds three lasting difficulties to the core features of PTSD: managing emotions, a negative view of self, and relationships [2][5].
• It is a diagnosis in ICD-11, the World Health Organization’s current classification. It is not in DSM-5-TR, the American manual [5][6].
• It usually follows prolonged or repeated trauma that was hard to escape, such as childhood or domestic abuse [2][3].
• Symptoms overlap heavily with borderline personality disorder, and how cleanly the two can be told apart is still argued over [4][5].
• NG116, the NICE PTSD guideline, sets no separate pathway for complex PTSD, and the evidence specific to it is thin [1][9].

What complex PTSD is

Complex PTSD, or CPTSD, is a diagnosis for a pattern that can follow prolonged or repeated trauma. It includes all the core features of PTSD, plus severe difficulty managing emotions, a persistently negative view of oneself, and lasting difficulty in relationships [2][5].

If you need help now. Samaritans: call 116 123, free, 24/7. Shout: text SHOUT to 85258. NHS 111, then choose the mental health option. Call 999 if anyone is in immediate danger.

ICD-11 lists complex PTSD as a diagnosis in its own right, while DSM-5-TR covers the same features inside its single, wider PTSD diagnosis and gives them no separate label [5][6]. Being told it “is not a real diagnosis” usually means the speaker works from the American manual.

The Adult Psychiatric Morbidity Survey for England 2023/4 screened for PTSD, not complex PTSD, so there is no NHS national figure [8]. A 2022 Lancet seminar cites a UK study in which 12.9% of trauma-exposed adults met criteria for complex PTSD and 5.3% for PTSD [5]. That is a figure for people who have experienced trauma, not for the population as a whole.

Symptoms

Complex PTSD includes every symptom of PTSD, then adds three groups ICD-11 calls disturbances in self-organisation [2][5].

Difficulty managing emotions

• Anger or irritability that is hard to settle, and strong reactions to setbacks [2][4].
• Numbness, difficulty feeling anything positive, or dissociation, feeling cut off from oneself [4].

A negative view of oneself

• Persistent beliefs about being diminished, defeated or worthless [2].
• Deep shame, guilt or a sense of failure that does not shift with reassurance [2].

Difficulty in relationships

• Persistent difficulty keeping relationships going and feeling close [2].
• Avoiding closeness, or finding trust hard even with safe people [4].

It is commonly confused with borderline personality disorder, depression, and sometimes autism [4].

Types

Complex PTSD has no recognised subtypes. ICD-11 instead separates two trauma diagnoses, and presentations differ by which features dominate [5][6].

• PTSD. Re-experiencing the event in the present, avoiding reminders, and a sense of current threat [6].
• Complex PTSD. Those plus the three disturbances of self-organisation [5][6]. A wider pattern, not a more severe version of the same one.
• Prominent dissociation. Feeling detached from oneself can dominate, and affects how treatment is paced [6].

ICD-11 requires significant difficulty in daily life, so severity is judged by effect on functioning [6].

Causes and risk factors

The direct cause is exposure to trauma: events that were prolonged, repeated, or hard to escape [2]. NICE names torture, slavery, genocide campaigns, prolonged domestic violence and repeated childhood sexual or physical abuse, and the NHS adds neglect [2][3].

Not everyone exposed to prolonged trauma develops complex PTSD, and there is no way to predict who will [5].

Two common ideas need care. The first is that only childhood abuse causes it: childhood-onset trauma is frequent and predicts poorer treatment response, but captivity, trafficking or long-term abuse in adulthood can too [2][9]. The second is that it is simply severe PTSD: the distinction rests on the three additional groups, not on intensity [5][6].

How it is diagnosed

Complex PTSD is diagnosed by a mental health professional, usually a psychiatrist or clinical psychologist, and a GP appointment is normally the first step [4]. NICE expects assessment to cover physical, psychological and social needs, and to include risk [2]. The self-report International Trauma Questionnaire is the only instrument assessing the ICD-11 criteria, and a score on it is not a diagnosis [5][6].

The argument with borderline personality disorder. Both involve difficulty with emotions, self-image and relationships, and many people meet criteria for either. Four things are said to separate them [5][6]:

• Complex PTSD requires trauma exposure. Borderline personality disorder does not.
• Self-image is steadily negative in complex PTSD, and unstable in borderline personality disorder.
• Complex PTSD tends towards avoiding relationships, rather than intense engagement and fear of abandonment.
• Self-harm and impulsivity are criteria for borderline personality disorder, not for complex PTSD.

The overlap is uneven: borderline personality disorder often brings complex PTSD symptoms, the reverse less often [5]. The evidence is not settled. A 2025 study of 97 women found no difference in borderline symptom severity or emotion regulation between the groups, but more trauma exposure and dissociation in complex PTSD [10]. Mind states that the overlap leads to misdiagnosis, and that both diagnoses can be present at once [4].

A diagnosis names a recognised pattern and opens access to specific treatments, but does not predict how long recovery takes.

Treatment

NICE guideline NG116 covers PTSD including complex PTSD, and sets no separate pathway for it [1][2].

Trauma-focused therapies. NICE recommends individual trauma-focused CBT for adults presenting more than a month after a traumatic event, and eye movement desensitisation and reprocessing (EMDR) more than three months after a non-combat trauma. Both run typically over 8 to 12 sessions, and more after multiple traumas [2].

Extra time. For people with complex needs, NICE recommends extra time to develop trust, by increasing the duration or number of sessions and removing barriers to starting [2].

What the evidence supports. A meta-analysis of 51 randomised trials found trauma-focused therapies reduced negative self-concept and relationship difficulties as well as PTSD symptoms, compared with usual care [9]. The authors rated that evidence low or very low quality for most outcomes, and childhood-onset trauma predicted smaller gains [9]. Trials in people formally diagnosed with complex PTSD are still needed [5].

Phase-based treatment. UK services widely use a three-phase model from the UK Psychological Trauma Society: stabilisation and safety, work on the traumatic memories, then reintegration [7]. That guideline says there is insufficient evidence to prefer any one therapy, and warns against unnecessarily delaying trauma-focused work [7]. The meta-analysis found too few trials to compare phased with non-phased treatment [9].

Medication. Venlafaxine or an SSRI can be considered for adults who prefer drug treatment, and antipsychotics only for disabling symptoms unresponsive to other treatments [2]. Decisions about medication are for a GP or prescriber.

Living with complex PTSD

Emotional flashbacks, which Mind describes as feelings returning with no picture attached, are easier to handle once named [4]. Grounding methods such as slow counted breathing or naming what you can see and hear help.

Trust taking a long time to build is expected, not a sign that therapy is failing. NICE tells services to allow for it by lengthening or adding sessions, so you can say at assessment that you need a slow start [2].

Using alcohol or drugs to blunt symptoms is worth telling your GP, because it changes what is offered and when. Telling an employer or university is your decision, and you can ask for changes to hours or deadlines without naming a diagnosis.

When to speak to a professional

If you need help now. Samaritans: call 116 123, free, 24/7. Shout: text SHOUT to 85258. NHS 111, then choose the mental health option. Call 999 if anyone is in immediate danger.

See a GP if symptoms are affecting work, study or family life. NICE recommends trauma-focused therapy for people presenting more than a month after a traumatic event [2]. Ask for help sooner if you are dissociating often enough to be unsafe, using alcohol or drugs to cope, or having thoughts of harming yourself or anyone else.

If you are 18 or over, or 16 or over in some areas, you can self-refer to an NHS talking therapies service without a GP referral [3]. Assessment for complex PTSD usually needs referral to a community mental health team or specialist trauma service [4].

Common questions

Is complex PTSD a real diagnosis?

In the UK, yes. ICD-11, the World Health Organization’s current classification, lists it as a diagnosis in its own right [5][6]. DSM-5-TR does not, which is why some clinicians say it is not real [6]. NHS records in England are still coded to ICD-10, which has no code for it, so it may not appear in your notes under that name.

What is the difference between complex PTSD and PTSD?

Complex PTSD has all the PTSD symptoms plus three lasting difficulties: managing emotions, a negative view of self, and relationships [2][5]. It follows prolonged or repeated trauma rather than a single event [2].

Is complex PTSD the same as borderline personality disorder?

No, though they overlap and can occur together [4]. Complex PTSD requires trauma exposure, and self-harm and impulsivity are not among its criteria [5][6]. Researchers still argue over how cleanly the two can be told apart [5][10].

Clinical review pending

References

1. National Institute for Health and Care Excellence. Recommendations: Post-traumatic stress disorder. NICE guideline NG116, published 5 December 2018. https://www.nice.org.uk/guidance/ng116/chapter/Recommendations
2. National Institute for Health and Care Excellence. Post-traumatic stress disorder. NICE guideline NG116, full guideline text on NCBI Bookshelf, published 5 December 2018. https://www.ncbi.nlm.nih.gov/books/NBK542453/
3. NHS. Post-traumatic stress disorder (PTSD). nhs.uk, page last reviewed 8 April 2026. https://www.nhs.uk/mental-health/conditions/post-traumatic-stress-disorder-ptsd/
4. Mind. Complex post-traumatic stress disorder (complex PTSD). mind.org.uk, last updated February 2026. https://www.mind.org.uk/information-support/types-of-mental-health-problems/post-traumatic-stress-disorder-ptsd-and-complex-ptsd/complex-ptsd/
5. Maercker A, Cloitre M, Bachem R, Schlumpf YR, Khoury B, Hitchcock C, Bohus M. Complex post-traumatic stress disorder. The Lancet, 2022, volume 400, issue 10360, pages 60 to 72. https://www.ptsd.va.gov/professional/articles/article-pdf/id1596001.pdf
6. Brewin CR. Complex post-traumatic stress disorder: a new diagnosis in ICD-11. BJPsych Advances, 2020, volume 26, issue 3, pages 145 to 152. https://www.cambridge.org/core/journals/bjpsych-advances/article/complex-posttraumatic-stress-disorder-a-new-diagnosis-in-icd11/2977140CBDAAF402610715BB609F688C
7. McFetridge M, Hauenstein Swan A, Heke S, Karatzias T, Greenberg N, Kitchiner N, Morley R. Guideline for the treatment and planning of services for complex post-traumatic stress disorder in adults. UK Psychological Trauma Society, February 2017. https://ukpts.org/wp-content/uploads/2018/03/guidance_11_2920929231.pdf
8. NHS England Digital. Adult Psychiatric Morbidity Survey: Survey of Mental Health and Wellbeing, England, 2023/4. Chapter: Posttraumatic stress disorder, published 27 November 2025. https://digital.nhs.uk/data-and-information/publications/statistical/adult-psychiatric-morbidity-survey/survey-of-mental-health-and-wellbeing-england-2023-24/posttraumatic-stress-disorder
9. Karatzias T, Murphy P, Cloitre M, Bisson J, Shevlin M, Hyland P, Maercker A, Ben-Ezra M, Coventry P, Mason-Roberts S, Bradley A, Hutton P. Psychological interventions for ICD-11 complex PTSD symptoms: systematic review and meta-analysis. Psychological Medicine, 2019, volume 49, issue 11, pages 1761 to 1775. https://orca.cardiff.ac.uk/119703/1/Binder1.pdf
10. Simon JJ, Spiegler K, Coulibaly K, Stopyra MA, Friederich HC, Gruber O, Nikendei C. Beyond diagnosis: symptom patterns across complex PTSD and borderline personality disorder. Frontiers in Psychiatry, 2025, volume 16, article 1668821. https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2025.1668821/full