Complex Trauma: What It Is and How Therapy Can Help

Complex trauma refers to the psychological effects of prolonged, repeated, or multiple traumatic experiences, particularly those involving interpersonal harm. It is distinct from post-traumatic stress disorder (PTSD) that follows a single traumatic event, though the two overlap in important ways. This article explains what complex trauma is, how it tends to present in adults, and what therapy approaches are used to address it.

What is complex trauma?

The term ‘complex trauma’ was developed to account for presentations that didn’t fit neatly within the original PTSD diagnostic framework, which was built around responses to discrete, single events such as accidents, natural disasters, or assault.

Complex trauma typically involves:

• Prolonged exposure to traumatic experiences (months or years, not a single incident)
• Interpersonal harm, often by a person in a position of care, trust, or power (a parent, partner, carer, or institution)
• Experiences that began in childhood or adolescence, when neurological and psychological development was underway

Common examples include childhood emotional, physical, or sexual abuse, neglect, domestic violence, institutional abuse, captivity, and prolonged exposure to community violence.

The ICD-11 now formally recognises Complex PTSD (CPTSD) as a distinct diagnosis, separate from PTSD. CPTSD includes the core PTSD symptoms (re-experiencing, avoidance, and hyperarousal) alongside disturbances in self-organisation: difficulties with affect regulation, a negative self-concept, and problems in relationships.

How does complex trauma present in adults?

Complex trauma doesn’t always look like what people expect from the word ‘trauma.’ Not everyone with a complex trauma history has flashbacks or visible distress responses. The presentation is often subtler and longer-lasting.

Common presentations in adults include:

• Emotional regulation difficulties. Intense emotional responses that feel disproportionate to the situation; difficulty calming down after being activated; emotional numbness or feeling cut off from emotions.
• A persistent negative self-concept. Deep feelings of shame, defectiveness, or worthlessness that don’t shift easily with reassurance or evidence. A sense that something is fundamentally wrong with the self, rather than with what happened.
• Relationship difficulties. Difficulty trusting others; fear of abandonment or rejection; moving between closeness and withdrawal; difficulty maintaining stable relationships.
• Physical symptoms. Complex trauma has strong associations with somatic presentations (chronic pain, fatigue, gastrointestinal symptoms, and other physical complaints that may not have a clear medical explanation).
• Dissociation. Experiences of detachment from thoughts, feelings, or the body; gaps in memory; feeling as though events are not quite real.
• Hypervigilance. A state of heightened alertness and scanning for threats, even in safe environments.

Many adults with complex trauma histories have received other diagnoses (depression, anxiety, personality disorder, or chronic pain conditions) before the underlying trauma history was recognised. This isn’t because those diagnoses are necessarily wrong, but because complex trauma presentations are often complex, and the history is not always asked about or disclosed.

How is complex trauma different from PTSD?

Both PTSD and Complex PTSD involve responses to traumatic experience. The key differences:

• PTSD follows a specific traumatic event and is characterised by intrusion (flashbacks, nightmares), avoidance, and hyperarousal.
• Complex PTSD (CPTSD) includes those features but also involves persistent difficulties with emotional regulation, self-perception, and relationships, which develop from prolonged and often interpersonal trauma.

In practice, a thorough assessment is required to distinguish the two, and they can also co-exist. The distinction matters for treatment planning because the two experiences respond somewhat differently to therapy.

What therapy approaches are used for complex trauma?

Treatment for complex trauma isn’t a simple linear process, and any approach that jumps straight to trauma processing without taking time for solid preparation carries some risk. Evidence-based practice in this area emphasises a phase-based approach.

• Phase 1: Safety and stabilisation. Before processing traumatic material, the focus is on building safety, stability, and foundational affect-regulation skills. This may involve psychoeducation, grounding techniques, and working on the therapeutic relationship itself.
• Phase 2: Trauma processing. Processing traumatic memories in a structured, gradual way. EMDR (Eye Movement Desensitisation and Reprocessing) and trauma-focused CBT are among the evidence-based approaches used at this stage. For complex presentations, processing is typically slower and more careful than in straightforward PTSD.
• Phase 3: Integration and reconnection. Building a coherent life narrative, improving relationships, and developing a stable sense of self outside of the trauma history.

Not every person progresses through all three phases in the same pattern. Some people spend longer in stabilisation, which is often appropriate and necessary. The aim is not to rush through phases, but to move safely.

Is therapy for complex trauma available via telehealth?

Yes. EMDR and other trauma-focused therapy approaches can be delivered via telehealth. There are specific adaptations for delivering EMDR online that address safety, resourcing, and the management of strong emotional responses during sessions.

Telehealth isn’t appropriate for all situations. If a person is in crisis, lacks a safe and private space for sessions, or has significant safety concerns, in-person or more intensive care may be needed. This is something a psychologist will assess together with you at the outset.

Frequently Asked Questions

What is the difference between trauma and complex trauma?

Trauma refers to the psychological response to any significantly distressing event. Complex trauma specifically refers to the effects of prolonged, repeated, or multiple traumatic experiences, particularly those involving interpersonal harm. Complex trauma tends to produce a broader and more persistent impact on self, relationships, and functioning than single-incident trauma.

Do I need a diagnosis of Complex PTSD to access therapy?

No. A formal CPTSD diagnosis isn’t required to access therapy. A psychologist will conduct their own assessment and work with what they find. Many people access psychology for difficulties that relate to their trauma history without ever having a formal diagnosis.

Is EMDR effective for complex trauma?

EMDR is an evidence-based approach recognised by the WHO and other bodies for the treatment of PTSD. For complex presentations, it’s typically adapted and delivered more slowly, within a phase-based framework. Research on EMDR for complex trauma and CPTSD is active and generally positive, though complex presentations may require more careful and experienced delivery.

How long does therapy for complex trauma take?

This varies a lot. Single-incident PTSD may respond to a focused course of therapy (10 to 20 sessions in many cases). Complex presentations, by their nature, take longer. Extended therapy of one to two years or more isn’t unusual for significant complex trauma histories. The pacing of therapeutic work is determined by safety and readiness, not by a fixed schedule.

How do I know if complex trauma is affecting me?

If you recognise elements of the presentation described above (difficulties with emotion regulation, persistent shame or self-criticism, relationship difficulties, or longstanding responses to stress that feel out of proportion), it may be worth speaking with a psychologist. An initial assessment is the right starting point.

If you are considering therapy for complex trauma or PTSD, information about my approach is available on the Therapy page. I offer telehealth sessions for adults across Australia and have extensive experience working with complex presentations, including trauma, ADHD, and related difficulties.

Veronica West is a registered psychologist (BPsychSc(Hons), MPH, MPsych) based on the Sunshine Coast, Queensland, offering individual therapy via telehealth across Australia. She works with adults experiencing complex trauma, PTSD, anxiety, burnout, and neurodivergence. She is also a Board-Approved Supervisor for provisional and registered psychologists.