Comorbidity occupies a contested and clinically urgent position within the depth-psychology and trauma literature. The corpus reveals at least three distinct registers in which the term operates. First, and most theoretically consequential, is the argument advanced by van der Kolk, Ford, and Spinazzola that developmental trauma disorder (DTD) carries a profile of comorbidities — encompassing both internalizing and externalizing disorders — that cannot be reduced to, nor fully accounted for by, the comorbidities of PTSD alone. This finding challenges diagnostic parsimony and presses the field toward nosological reform. Second, van der Hart's structural dissociation framework situates comorbidity within a spectrum hypothesis: the proliferation of co-occurring disorders in survivors of severe, chronic trauma may be more apparent than real, representing facets of a unitary traumagenic process rather than genuinely independent pathologies. Third, across addiction and neurodevelopmental literatures — spanning ASD, ADHD, PMDD, and substance use disorders — comorbidity functions as an index of treatment complexity, triage priority, and etiological ambiguity. The tension between these registers is productive: is comorbidity a diagnostic artifact of categorical nosology, a signal of shared traumatic etiology, or a genuine multiplicity demanding parallel intervention? The corpus does not resolve this question, but the most sophisticated voices insist that clinicians must track comorbidity actively rather than treat it as noise around a primary diagnosis.
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DTD has comorbidities that cannot be accounted for by the comorbidities of PTSD. DTD thus potentially could enable clinicians to identify children and adolescents who could benefit from trauma-focused treatment who would be overlooked if only PTSD was considered
Van der Kolk et al. argue that DTD's distinct comorbidity profile constitutes a clinically actionable diagnostic category that outstrips PTSD in identifying trauma-impacted youth.
van der Kolk, Bessel; Ford, Julian D.; Spinazzola, Joseph, Comorbidity of Developmental Trauma Disorder (DTD) and Post-Traumatic Stress Disorder: Findings from the DTD Field Trial, 2019thesis
children with externalizing disorders or internalizing (panic/separation anxiety) disorders may benefit from a thorough assessment of trauma history and of DTD symptoms to identify a potential subgroup who are experiencing clinically significant trauma-related symptoms
The DTD field trial demonstrates that comorbidity with internalizing and externalizing disorders should prompt systematic trauma screening rather than exclusive treatment of the 'primary' psychiatric disorder.
van der Kolk, Bessel; Ford, Julian D.; Spinazzola, Joseph, Comorbidity of Developmental Trauma Disorder (DTD) and Post-Traumatic Stress Disorder: Findings from the DTD Field Trial, 2019thesis
the profound range and overlap of symptoms and disorders that characterize survivors of traumatization, particularly when this traumatization was severe and chronic, suggest that the different symptoms and disorders are intimately linked
Van der Hart proposes that apparent comorbidity in trauma survivors is better understood as structurally unified manifestations of trauma-related dissociation of the personality rather than genuinely discrete disorders.
Hart, Onno van der, The Haunted Self Structural Dissociation and the Treatmentthesis
Developmental trauma disorder (DTD) has been proposed to describe the biopsychosocial sequelae of exposure to interpersonal victimization in childhood that extend beyond the symptoms of post-traumatic stress disorder (PTSD)
The DTD field trial is explicitly organized around characterizing comorbidity as both the empirical test and the clinical rationale for a new diagnostic construct beyond PTSD.
van der Kolk, Bessel; Ford, Julian D.; Spinazzola, Joseph, Comorbidity of Developmental Trauma Disorder (DTD) and Post-Traumatic Stress Disorder: Findings from the DTD Field Trial, 2019thesis
complicated clinical cases often involve multiple comorbidities (including both full and subthreshold Axis I or II diagnoses). In these cases, although attention to the symptoms involved in the comorbid conditions is important, it may be more clinically feasible to focus psychotherapy on core mechanisms
Courtois argues that in cases of multiple comorbidities, treatment should target core dysregulatory mechanisms rather than serially addressing each comorbid diagnosis.
Courtois, Christine A, Treating Complex Traumatic Stress Disorders (Adults) supporting
Six dimensions are assessed for individual patients in determining the appropriate level of care: (a) acute intoxication/withdrawal state, (b) medical comorbidity, (c) psychiatric comorbidity, (d) readiness for change, (e) potential for relapse, and (f) current recovery/living environment
In opioid use disorder treatment, comorbidity — both medical and psychiatric — is institutionally codified as one of six determinants of appropriate level-of-care placement.
Avery, Jonathan D., The Opioid Epidemic and the Therapeutic Community Model: An Essential Guide, 2019supporting
Benda's proportional-hazard model of readmission treats comorbidity as a discrete binary predictor variable alongside depression, PTSD, and memory loss in substance use disorder outcomes research.
Benda, Brent B., Spirituality and Religiousness and Alcohol/Other Drug Problems: Treatment and Recovery Perspectives, 2006supporting
Patients with ASD have characteristics such as poor social functioning, repetitive behavior, anxiety, emotional lability, and eccentricities or fixed habits of behavior that can mimic symptoms of other illnesses, including schizophrenia spectrum disorders, bipolar disorder, attention deficit hyperactivity disorder (ADHD)
Arnevik identifies ASD's symptom overlap with multiple psychiatric conditions as a source of diagnostic confusion that complicates the identification and treatment of genuine comorbidities.
Arnevik, Eli A., Autism Spectrum Disorder and Co-occurring Substance Use Disorder: A Systematic Review, 2016supporting
comorbidity with antisocial behaviors such as conduct disorder is rarely controlled for in imaging studies, but is likely to impact upon the deficit findings
Hart et al. flag uncontrolled comorbidity — particularly conduct disorder — as a methodological confound that undermines the validity of neuroimaging findings in ADHD research.
Hart, Heledd, Meta-analysis of fMRI studies of timing in attention-deficit hyperactivity disorder (ADHD), 2012supporting
Individuals with ADHD and comorbid mental health problems have especially elevated provisional PMDD risk
Broughton demonstrates that comorbid mental health conditions amplify PMDD risk in women with ADHD, pointing to a multiplicative rather than additive relationship among co-occurring disorders.
Broughton, Thomas, Increased risk of provisional premenstrual dysphoric disorder (PMDD) among females with attention-deficit hyperactivity disorder (ADHD): cross-sectional survey studysupporting
these findings suggest that women with PMDD experience greater inattention consistently across the menstrual cycle, and this effect is exacerbated during the LL phase; furthermore, this effect is not solely attributable to the comorbidity of ADHD
Lin et al. disentangle the independent contribution of PMDD from ADHD comorbidity, demonstrating that hormonal dysregulation exerts effects on inattention above and beyond comorbid diagnosis.
Lin, Pai-Cheng, Comorbid Attention Deficit Hyperactivity Disorder in Women with Premenstrual Dysphoric Disorder, 2024supporting
To report rates of psychiatric comorbidity. Results: Only three (0.7%) individuals were diagnosed as having co-occurring alcohol-related disorders according to the ICD-8
Systematic review data reveal striking variability in reported ASD-SUD comorbidity rates across studies, underscoring how sampling frame and diagnostic instrument shape comorbidity estimates.
Arnevik, Eli A., Autism Spectrum Disorder and Co-occurring Substance Use Disorder: A Systematic Review, 2016supporting
Hart et al.'s meta-regression finds no significant effect of comorbidity on fMRI timing-task results in ADHD, a null finding that itself constrains interpretation of neural deficit findings.
Hart, Heledd, Meta-analysis of fMRI studies of timing in attention-deficit hyperactivity disorder (ADHD), 2012aside
impulsive behavior represents a failure of affect regulation, while self-injury, substance abuse and eating disorders can be understood as ill-fated attempts at self-regulation
Lanius frames ostensibly comorbid conditions — self-injury, substance abuse, eating disorders — as functionally unified attempts at affect regulation rather than independent diagnostic entities.
Lanius, edited by Ruth A, The impact of early life trauma on health and disease the, 2010aside