EMDR for Complex Trauma: What Have Studies Found?

Eye Movement Desensitization and Reprocessing (EMDR) has been studied extensively for Post-Traumatic Stress Disorder (PTSD), including among people whose traumatic experiences were repeated, prolonged, or difficult to escape.

That matters because “complex trauma” is not the same as a single traumatic event.

People described as having complex trauma histories may have experienced childhood abuse, repeated interpersonal violence, domestic violence, captivity, war, displacement, torture, trafficking, or other prolonged traumatic circumstances.

Some people with these histories meet criteria for Complex Post-Traumatic Stress Disorder, often shortened to complex PTSD. Complex PTSD includes the core symptoms of PTSD along with additional difficulties involving emotional regulation, self-concept, and relationships. PubMed Central (PMC)

Researchers have asked an important question: Can a focused trauma treatment such as EMDR still be effective when the trauma history is complex?

The available research suggests that it can.

Systematic reviews and randomized trials have found meaningful reductions in PTSD symptoms among people with complex trauma histories, including repeated childhood abuse. Some studies also find improvements in depression, anxiety, and other difficulties.

At the same time, complex trauma includes many different populations and experiences, so no single study can answer every question about treatment.

The most reasonable conclusion from the current evidence is that complex trauma does not automatically require avoiding or delaying trauma-focused EMDR, and substantial improvement is possible even when the trauma history is prolonged or repeated. PubMed Central (PMC)

What Does “Complex Trauma” Mean?

“Complex trauma” is a broad descriptive term rather than one single diagnosis.

It is often used for traumatic experiences that are:

• repeated or prolonged;

• interpersonal;

• difficult or impossible to escape;

• or experienced during important developmental periods.

Examples can include repeated childhood abuse, domestic violence, torture, trafficking, captivity, war, or prolonged displacement.

Researchers studying complex trauma often focus not only on classic PTSD symptoms, such as intrusive memories, avoidance, and a continuing sense of threat, but also on difficulties involving emotions, relationships, and self-perception.

This is where the diagnosis of complex PTSD becomes relevant.

What Is Complex PTSD?

Complex PTSD is included as a distinct diagnosis in the 11th Revision of the International Classification of Diseases (ICD-11).

It includes the core features of PTSD plus three additional areas known as disturbances in self-organization:

• difficulties regulating emotions;

• a persistently negative sense of self;

• and difficulties in relationships. PubMed Central (PMC)

Complex PTSD is often associated with repeated or prolonged traumatic experiences, particularly situations in which escape was difficult.

However, not everyone with a complex trauma history develops complex PTSD.

Someone can have experienced repeated trauma and meet criteria for ordinary PTSD rather than complex PTSD, while another person may have a complex PTSD symptom pattern.

That distinction matters when reading research because many studies involve people with complex trauma histories without requiring every participant to meet formal complex PTSD diagnostic criteria.

Has EMDR Been Studied in People With Complex Trauma?

Yes.

A 2018 systematic review examined randomized controlled trials of EMDR in adults and children exposed to complex childhood trauma.

The review identified six randomized controlled trials involving 251 participants.

Across those studies, EMDR was associated with reductions in PTSD symptoms and, in several trials, depression or anxiety as well. Improvements were found after treatment and at follow-up.

The comparison conditions included Cognitive Behavioral Therapy, other individual or group therapies, fluoxetine, treatment as usual, active listening, delayed EMDR, and placebo medication. PubMed Central (PMC)

The studies were quite different from one another in treatment length, population, comparison group, and outcome measures.

That makes it difficult to calculate one simple overall effect.

But the direction of the findings was broadly favorable.

What Do Broader Reviews of Complex Trauma Treatments Show?

Research on complex trauma is not limited to EMDR.

A large systematic review and network meta-analysis examined psychological and medication treatments for people exposed to complex traumatic events such as childhood sexual abuse, domestic violence, armed conflict, forced displacement, and other prolonged or repeated trauma.

Across 46 trials, psychological treatments significantly reduced PTSD symptoms.

Trauma-focused Cognitive Behavioral Therapy, Interpersonal Psychotherapy, and EMDR were all associated with large treatment effects compared with control conditions. PubMed Central (PMC)

The review also examined depression and other mental-health outcomes.

EMDR was associated with significant reductions in depressive symptoms compared with control conditions, although estimates were less precise when EMDR was compared with other active treatments. PubMed Central (PMC)

This broader evidence is important because it challenges the assumption that people with complex trauma histories necessarily respond poorly to direct trauma-focused treatment.

Does Complex Trauma Require a Special Preparatory Phase Before EMDR?

This has been one of the most debated questions.

A common clinical idea has been that people with repeated childhood trauma or complex PTSD symptoms may need a separate stabilization or skills-training phase before beginning trauma-focused treatment.

Researchers have tested that assumption directly.

A randomized clinical trial included 121 adults with PTSD following childhood abuse.

Participants were assigned to one of two treatments:

• 16 sessions of EMDR beginning immediately;

• or eight sessions of Skills Training in Affect and Interpersonal Regulation (STAIR) followed by 16 sessions of EMDR.

STAIR is a structured treatment focused on emotional and interpersonal skills.

Researchers wanted to know whether the phase-based approach produced better outcomes than beginning EMDR directly.

It did not.

Both groups improved significantly, and researchers found no significant differences between the treatments at the end of treatment or during follow-up. Cambridge University Press

What Happened to PTSD Symptoms in That Trial?

The reductions were substantial.

Across both treatment groups, 68.8% of participants no longer met diagnostic criteria for PTSD after treatment.

Self-reported PTSD symptoms also declined significantly in both groups.

The immediate-EMDR group showed a large reduction in symptoms, and the STAIR-plus-EMDR group also improved substantially.

The improvements remained through three- and six-month follow-up. Cambridge University Press

The study therefore did not support the idea that people with childhood-abuse-related PTSD necessarily need a separate preparatory treatment before trauma processing begins.

That does not mean a preparation phase has no value in any circumstance.

It means the research does not support making it a universal requirement simply because someone's trauma history is complex.

What About Complex PTSD Symptoms Specifically?

The same randomized trial also measured complex PTSD symptoms.

Some participants met complex PTSD criteria before treatment.

Researchers found improvements in complex PTSD-related symptoms in both treatment conditions and did not find evidence that the phase-based approach was superior to immediate EMDR. Cambridge University Press

This is an important finding because it addresses more than ordinary PTSD symptoms.

It suggests that people experiencing broader difficulties with emotion regulation, relationships, and self-concept can still improve during trauma-focused EMDR treatment.

However, the study does not establish that EMDR alone is always sufficient for every difficulty associated with complex PTSD.

It shows that complex PTSD symptoms do not automatically prevent meaningful response to EMDR.

Does Direct Trauma Processing Make Outcomes Worse in Complex Trauma?

The available randomized research does not support that assumption.

In the phase-based versus immediate-EMDR trial, the immediate EMDR group did not show worse outcomes, higher dropout, or study-related adverse events compared with the group receiving preparatory treatment first. Cambridge University Press

Dropout rates were:

• 17.2% in the immediate EMDR group;

• 22.8% in the STAIR-plus-EMDR group.

The difference was not statistically significant. Cambridge University Press

This finding is useful because complex trauma is sometimes described as if direct memory processing is inherently too difficult for this population.

The trial does not support such a general conclusion.

Does EMDR Help With Problems Beyond PTSD Symptoms?

Some studies suggest broader improvements.

The 2018 systematic review of complex childhood trauma found reductions not only in PTSD symptoms but also in depression and anxiety in several of the included trials. PubMed Central (PMC)

The larger complex-trauma treatment review also found that EMDR was associated with reductions in depressive symptoms compared with control conditions. PubMed Central (PMC)

This matters because people with complex trauma histories may experience difficulties across several areas rather than PTSD symptoms alone.

Research may therefore examine:

• depression;

• anxiety;

• emotional regulation;

• interpersonal difficulties;

• negative beliefs about the self;

• and general functioning.

Still, the strongest conclusions depend on what each study actually measured.

It would be too broad to assume that improvement in PTSD symptoms means every other difficulty automatically resolves as well.

Is Complex Trauma the Same as Childhood Trauma?

Not exactly.

There is substantial overlap because repeated childhood abuse is one of the most commonly studied forms of complex trauma.

But complex trauma can also occur in adulthood.

Examples include:

• prolonged domestic violence;

• captivity;

• torture;

• trafficking;

• repeated interpersonal violence;

• forced displacement;

• and prolonged exposure to armed conflict.

The broader systematic review of complex-trauma treatments included several of these populations. PubMed Central (PMC)

The earlier article EMDR for Childhood Trauma: What Does the Research Show? looks specifically at trauma occurring during childhood.

This article addresses the wider question of repeated, prolonged, or complex traumatic exposure.

What About Adolescents With Complex PTSD?

Research has also begun examining EMDR specifically in adolescents meeting formal complex PTSD criteria.

A 2024 prospective case series included 22 adolescents ages 12 to 17 who had experienced childhood abuse and met ICD-11 criteria for complex PTSD.

After three months of EMDR treatment, average PTSD symptom scores decreased significantly. PubMed Central (PMC)

Because this was a case series rather than a randomized controlled trial, it cannot establish that EMDR caused the improvements by itself.

It does, however, add to the evidence that EMDR can be studied and used in populations with complex PTSD rather than only with simple single-event trauma.

The separate article EMDR for Children and Teenagers With PTSD: What Does the Evidence Show? examines the younger population more broadly.

Does Complex Trauma Take Longer to Treat?

The research does not provide one universal treatment length.

Some complex-trauma studies use longer protocols than trials involving one clearly defined traumatic event.

That is understandable because people may have:

• several target memories;

• repeated experiences;

• different periods of trauma;

• or several symptom areas being addressed.

But complexity of trauma history does not automatically tell researchers exactly how many EMDR sessions someone will need.

The randomized childhood-abuse trial used 16 EMDR sessions in the immediate-treatment group. The phase-based group received eight STAIR sessions followed by 16 EMDR sessions. Cambridge University Press

Other studies use different schedules.

As with EMDR research generally, treatment length needs to be interpreted in relation to the population and protocol rather than treated as a fixed rule.

Does Complex Trauma Make EMDR Less Effective Than It Is for Single-Event PTSD?

The available evidence does not support a simple statement that EMDR becomes ineffective when trauma is complex.

A general 2026 meta-analysis of EMDR randomized trials continued to find significant reductions in PTSD symptoms overall, while the complex-trauma-specific reviews described above show substantial benefits in populations exposed to repeated or prolonged trauma. PubMed Central (PMC)

However, direct comparisons between people with simple and complex trauma are not always available.

So it would be too strong to claim that outcomes are identical across every trauma type.

The more defensible conclusion is:

People with complex trauma histories can respond substantially to EMDR, and the presence of repeated or prolonged trauma does not by itself rule out successful treatment.

What Are the Main Limitations of the Research?

Complex trauma is difficult to study because the term covers a wide range of experiences.

One participant may have experienced childhood sexual abuse.

Another may have experienced repeated domestic violence.

Another may have survived war or torture.

These experiences can differ considerably in timing, duration, developmental context, and current symptoms.

Research studies also vary in whether they define complexity by:

• trauma history;

• formal complex PTSD diagnosis;

• repeated interpersonal trauma;

• childhood abuse;

• or broader symptom patterns.

The 2018 EMDR review included only six randomized trials and noted substantial differences across the studies. PubMed Central (PMC)

The larger complex-trauma review included more studies, but it combined several different trauma populations and treatment approaches. PubMed Central (PMC)

These differences limit how precisely researchers can answer questions such as:

Which people with complex trauma benefit most from EMDR?

or:

Which treatment format works best for a particular complex-trauma profile?

What Questions Are Researchers Still Studying?

Several questions remain important.

Researchers continue to examine:

• whether some groups benefit from preparation before trauma processing;

• how EMDR affects complex PTSD symptoms beyond core PTSD symptoms;

• how many sessions are useful for different trauma histories;

• whether certain adaptations improve outcomes;

• how treatment works across childhood and adult complex trauma;

• and how EMDR compares directly with other trauma-focused approaches.

One of the most important developments has been the move away from assuming that complex trauma automatically requires fundamentally different treatment.

Researchers are increasingly testing those assumptions directly rather than treating them as established facts.

What Can We Reasonably Conclude?

The research on EMDR and complex trauma supports several conclusions.

First, EMDR has been directly studied in people with repeated and prolonged trauma histories, including childhood abuse and other complex traumatic experiences.

Second, systematic reviews and randomized trials consistently report meaningful reductions in PTSD symptoms among people receiving EMDR. PubMed Central (PMC)

Third, some studies also report improvements in depression, anxiety, and related difficulties.

Fourth, randomized research does not support the assumption that everyone with complex trauma or complex PTSD symptoms needs a separate stabilization phase before beginning trauma-focused EMDR. Cambridge University Press

And finally, complex trauma is not one uniform research population. Experiences, symptoms, and treatment needs vary, which means conclusions need to remain tied to the people and protocols actually studied.

The broader finding is nevertheless clear:

EMDR can produce substantial improvement in people with complex trauma histories, including those with repeated childhood abuse and complex PTSD symptoms.

Frequently Asked Questions

Can EMDR be used for complex trauma?

Yes. Randomized trials and systematic reviews include people with repeated or prolonged trauma histories and show meaningful reductions in PTSD symptoms after EMDR. PubMed Central (PMC)

Is complex PTSD the same as PTSD?

Not exactly. Complex PTSD includes the core PTSD symptoms plus additional difficulties involving emotional regulation, negative self-concept, and relationships. PubMed Central (PMC)

Does someone with complex trauma always need stabilization before EMDR?

Research does not support a universal requirement. In one randomized trial, immediate EMDR performed as well as a phase-based approach that included eight sessions of skills training before EMDR. Cambridge University Press

Can EMDR help if the trauma happened repeatedly over many years?

Yes. Several studies involve people with repeated childhood abuse or other prolonged trauma histories and report substantial improvement.

Has EMDR been studied specifically in complex PTSD?

Yes, although the research base using the formal ICD-11 complex PTSD diagnosis is smaller than the broader research on complex trauma.

Studies include randomized adult research measuring complex PTSD symptoms and more recent work specifically involving adolescents meeting complex PTSD criteria. Cambridge University Press

Conclusion

Complex trauma can involve repeated, prolonged, or interpersonal experiences and may be associated with a wider range of difficulties than a single traumatic event.

Research does not suggest that these histories make EMDR ineffective.

Systematic reviews and randomized trials show that people with complex trauma histories can experience substantial reductions in PTSD symptoms with EMDR, with some studies also reporting improvements in depression, anxiety, and related difficulties. PubMed Central (PMC)

Research has also challenged the assumption that everyone with complex trauma needs a separate stabilization phase before trauma-focused work begins.

In a randomized trial of adults with PTSD related to childhood abuse, immediate EMDR produced outcomes comparable with a longer phase-based treatment. Cambridge University Press

There are still important questions about who benefits most, how complex PTSD symptoms respond over time, and which treatment formats are best for particular populations.

But the evidence supports a clear overall conclusion:

Complex trauma does not place someone outside the EMDR evidence base. Studies show that EMDR can be an effective trauma-focused treatment even when traumatic experiences were repeated, prolonged, or associated with complex PTSD symptoms.