Comorbidity

Comorbidity occupies a structurally critical position in the depth-psychology and trauma literature, functioning simultaneously as a diagnostic problem, a nosological challenge, and a theoretical opportunity. The corpus reveals three broad orientations. First, van der Kolk, Ford, and Spinazzola advance the most theoretically ambitious argument: that Developmental Trauma Disorder carries a pattern of comorbid internalizing and externalizing disorders irreducible to PTSD’s own comorbidity profile, suggesting that trauma-related suffering is systematically misrecognized when clinicians attend only to primary diagnoses. Second, van der Hart and the structural dissociation school treat comorbidity as epiphenomenal to a deeper organizing principle — namely, trauma-related structural dissociation of the personality — and propose that the bewildering plurality of co-occurring conditions signals a spectrum rather than a catalogue of discrete entities. Third, the addiction and neurodevelopmental literature (Arnevik, Najavits, Avery, Wilens, Broughton) treats comorbidity primarily as a clinical-management variable: a dimension that complicates treatment matching, predicts dropout, and demands individualized intervention. Courtois bridges these camps, distinguishing ‘simple’ from ‘multiple’ comorbidity and arguing for formulation around core dysregulatory mechanisms rather than symptom-by-symptom enumeration. Across all strands the animating tension is whether comorbidity reflects genuine nosological pluralism, misclassification of a unitary trauma response, or a clinically pragmatic heuristic.

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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). Objective: To characterize the psychopathology comorbid with DTD and to determine whether this comorbidity is distinct from, and extends beyond, comorbidities of PTSD.

This paper frames comorbidity as the empirical test for DTD’s construct validity, asking whether trauma-related multi-morbidity exceeds what PTSD alone can account for.

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

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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 distinctive comorbidity profile justifies the diagnosis as a clinical gateway, revealing a population whose trauma goes unaddressed under PTSD-only frameworks.

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

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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 and who might benefit from trauma-focused treatment yet otherwise may be overlooked.

The paper proposes comorbidity as a clinical signal warranting trauma-history screening, reversing the conventional diagnostic hierarchy that treats primary disorders as explanatory.

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

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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 reframes comorbidity as evidence for a unitary underlying mechanism — structural dissociation — rather than genuine diagnostic multiplicity, challenging categorical nosology.

Hart, Onno van der, The Haunted Self Structural Dissociation and the Treatmentthesis

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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, such as dysregulation of bodily–affective–cognitive–interpersonal functioning.

Courtois advocates shifting clinical attention from comorbidity enumeration to core dysregulatory mechanisms, offering a transdiagnostic alternative to symptom-by-symptom treatment.

Courtois, Christine A, Treating Complex Traumatic Stress Disorders (Adults) thesis

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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.

Within addiction-medicine frameworks, psychiatric comorbidity is codified as one of six dimensions governing treatment placement, illustrating its role as a pragmatic clinical variable.

Avery, Jonathan D., The Opioid Epidemic and the Therapeutic Community Model: An Essential Guide, 2019supporting

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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), avoidant personality disorder, social anxiety disorder, and mood disorder.

Arnevik highlights the diagnostic complexity introduced when ASD symptomatology mimics other conditions, underscoring how comorbidity in neurodevelopmental populations is often entangled with misidentification.

Arnevik, Eli A., Autism Spectrum Disorder and Co-occurring Substance Use Disorder: A Systematic Review, 2016supporting

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Both disorders require long-term treatment and involve multiple parts and levels of both specialized treatment facilities and support in the primary health services. That sort of study requires a large and expensive research project that might be difficult to finance.

The review identifies co-occurring ASD and SUD as a paradigm case where comorbidity creates structural barriers to both research and treatment delivery.

Arnevik, Eli A., Autism Spectrum Disorder and Co-occurring Substance Use Disorder: A Systematic Review, 2016supporting

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Individuals with ADHD and comorbid mental health problems have especially elevated provisional PMDD risk.

Broughton demonstrates that comorbid psychiatric conditions in ADHD compound vulnerability to hormonal mood disorders, illustrating a multiplicative rather than additive comorbidity dynamic.

Broughton, Thomas, Increased risk of provisional premenstrual dysphoric disorder (PMDD) among females with attention-deficit hyperactivity disorder (ADHD): cross-sectional survey studysupporting

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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’s study methodologically isolates PMDD symptomatology from ADHD comorbidity, demonstrating that hormonal dysregulation generates independent attentional impairment beyond what comorbidity alone explains.

Lin, Pai-Cheng, Comorbid Attention Deficit Hyperactivity Disorder in Women with Premenstrual Dysphoric Disorder, 2024supporting

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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. identify comorbidity as a methodological confound in neuroimaging research on ADHD, arguing that failure to control for co-occurring conditions distorts understanding of the disorder’s neural substrate.

Hart, Heledd, Meta-analysis of fMRI studies of timing in attention-deficit hyperactivity disorder (ADHD), 2012supporting

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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 implicitly addresses comorbidity by reconceiving multiple co-occurring behavioral disorders as functionally unified attempts at affect regulation following early trauma.

Lanius, edited by Ruth A, The impact of early life trauma on health and disease the, 2010aside

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Related terms