Three patterns separate Complex PTSD from PTSD in the ICD-11 model: affect dysregulation, negative self-concept, and disturbed relationships. Clinicians group them under one term, DSO, disturbances in self-organization, because they consistently show up together.
Where the DSO Concept Came From
The grouping is not just clinical intuition. Latent profile analysis across four large samples, led by Marylene Cloitre and colleagues, found that people with a history of prolonged or repeated trauma statistically clustered into a distinct profile: the three core PTSD symptoms plus these three additional domains. That empirical pattern is what the ICD-11 working group built the Complex PTSD category around.
1. Affect Dysregulation
Difficulty keeping emotions within a manageable range — either overwhelming reactions to small triggers, or an emotional shutdown that makes feelings hard to access at all. Both directions reflect the same underlying difficulty: a nervous system that struggles to find a steady middle ground.
2. Negative Self-Concept
A persistent belief of being damaged, worthless, or permanently different because of what happened — often including deep shame or self-blame, even for things that were never the person's fault.
3. Disturbed Relationships
Difficulty feeling close to or trusting other people, sometimes alternating between longing for connection and pulling away from it. This often traces back to trauma that involved someone the person depended on or trusted.
None of these three domains are personality flaws. They are documented, researched patterns that follow prolonged or repeated trauma — and all three are treatable.
Do All Three Need to Be Present?
A full ICD-11 diagnosis generally involves significant difficulty across all three domains, alongside the three core PTSD clusters. That said, someone might notice strong signs in just one or two — which is still worth naming and discussing with a professional, since partial patterns still respond to the same evidence-based treatments.