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Psychiatric Comorbidities in Patients Diagnosed with Dissociative Identity DisorderCommon Mental Health Conditions Often Coexist with Dissociative Identity Disorder

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Key Takeaway
PTSD, major depressive disorder, and borderline personality disorder are highly prevalent in patients with DID.

This meta-analysis evaluated the prevalence of psychiatric comorbidities among 858 adults diagnosed with Dissociative Identity Disorder (DID). The study aimed to quantify the frequency of co-occurring conditions to better understand the clinical landscape of this complex dissociative disorder.

Findings indicate that Posttraumatic Stress Disorder (PTSD) has the highest pooled prevalence at 87.44%. Major depressive disorder was the second most frequent comorbidity, with a pooled prevalence of 62.64%. Borderline personality disorder was also frequently observed, showing a pooled prevalence of 47.05%.

While these figures highlight significant overlap between DID and other psychiatric conditions, the results are impacted by substantial heterogeneity and methodological variations. The certainty of evidence remains varied across the different outcomes studied.

To improve clinical clarity, the authors suggest that standardized diagnostic assessments and more representative sampling are necessary. Longitudinal research is also recommended to determine the specific clinical significance of these comorbid conditions in long-term patient management.

How this fits prior evidence

This meta-analysis addresses a gap in understanding the prevalence of psychiatric comorbidities in Dissociative Identity Disorder. While previous evidence noted that GERD shares a significant genetic overlap with internalizing disorders like MDD and PTSD, this study provides specific prevalence data for those same conditions in a population with Dissociative Identity Disorder. The findings confirm high rates of PTSD (87.44%) and MDD (62.64%) in this specific population.

Researchers looked at the prevalence of other mental health conditions in adults with Dissociative Identity Disorder (DID). The study analyzed data from 858 people to see how often these conditions appear together. This is important because many people with DID face complex symptoms that require careful management.

The findings show that Posttraumatic Stress Disorder (PTSD) is the most common condition found alongside DID, with a reported prevalence of 87.44%. Major depressive disorder was the second most common, appearing in 62.64% of cases. Borderline personality disorder was also frequently noted, with a prevalence of 47.05%.

It is important to note that these numbers come from a meta-analysis, which combines many different studies. Because the original studies used different methods and had varying levels of quality, the exact percentages may vary. These results are intended to help doctors better understand the common patterns of symptoms in patients with DID.

What this means for you:
Many people with Dissociative Identity Disorder also experience PTSD, depression, and borderline personality disorder.

Common questions

What are the most common conditions found with Dissociative Identity Disorder?

The study found that Posttraumatic Stress Disorder (PTSD) has the highest prevalence at 87.44%. Major depressive disorder was the second most common at 62.64%. Borderline personality disorder was the third most common condition found in the group of 858 adults.

How reliable are these prevalence numbers for Dissociative Identity Disorder?

The certainty of these numbers is varied. Because the study combined many different reports with different methods, there is a lot of variation in the data. These figures show a link between conditions but are limited by the different ways the original studies were conducted.

What does this mean for people seeking treatment?

These findings suggest that many people with Dissociative Identity Disorder also deal with depression and PTSD. Because of the high overlap between these conditions, doctors may need to use standardized assessments and more consistent research to provide the best care for each individual.

Study Details

Study typeMeta analysis
Sample sizen = 858
EvidenceLevel 1
PublishedOct 2026
View Original Abstract ↓
Background: Dissociative identity disorder (DID) is associated with frequent psychiatric comorbidity. Its complex and overlapping symptom profile can complicate recognition of both DID and co-occurring psychiatric conditions, contributing to diagnostic uncertainty. Evidence regarding psychiatric comorbidity is limited and prevalence estimates vary across studies. Aims: This meta-analysis aimed to examine the prevalence of psychiatric comorbidities in DID and factors associated with variation in prevalence estimates. Methods: Eligible studies were identified through PubMed, Scopus, Embase, PsycINFO, and MEDLINE from 1980 to 25 April 2026 (PROSPERO, no. CRD420261335819). Studies reporting psychiatric comorbidity in adults with DID were independently screened by two reviewers. Risk of bias was assessed. Random-effects meta-analyses using logit-transformed prevalence estimates were conducted. Meta-regressions examined moderators, whilst influence and sensitivity analyses assessed robustness. Certainty was evaluated using the GRADE approach. Results: Twenty-four studies (N = 858) contributed to the meta-analysis across 23 psychiatric comorbidities. Among individuals with DID, posttraumatic stress disorder had the highest pooled prevalence (87.44%, 95% CI 71.79-94.96), followed by major depressive disorder (62.64%, 95% CI 33.45-84.84), and borderline personality disorder (47.05%, 95% CI 34.21-60.32). Substantial heterogeneity was noted across most estimates. Meta-regressions identified significant associations with participant characteristics, recruitment, study quality, and diagnostic method. Risk of bias and certainty of evidence were heterogenous. Conclusions: Psychiatric comorbidity in DID is substantial and spans multiple diagnostic categories, although considerable heterogeneity and methodological variation limit confidence in prevalence estimates. Standardised diagnostic assessment, more representative sampling, and longitudinal research are needed to clarify the extent and clinical significance of comorbidity in DID.
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