Comorbidity guide
The core distinction lies in function and experience. Autistic routines and special interests are generally ego-syntonic — they feel good, serve a regulatory purpose, and the person wants to engage in them. OCD compulsions are ego-dystonic — they are driven by distress, the person recognizes them as excessive or irrational, and they would stop if they could. However, this distinction is less clear-cut in practice.
Some autistic individuals experience "autistic OCD" where obsessions and compulsions are thematically linked to autistic traits. A person with contamination OCD may have heightened distress because of sensory sensitivity to textures. Ordering and symmetry compulsions may blend with a genuine autistic need for visual consistency. Clinicians must assess whether the behavior reduces distress (suggesting OCD) or produces satisfaction (suggesting autistic RRB).
In children, differentiation is especially challenging. Parents and teachers may dismiss compulsive behaviors as "just their autism." The Children's Yale-Brown Obsessive Compulsive Scale (CY-BOCS) can be adapted for autistic children, but requires a skilled evaluator who understands both conditions.
Exposure and Response Prevention (ERP) is the gold-standard treatment for OCD and can be effective for autistic individuals with genuine OCD. Key adaptations include visual supports for the exposure hierarchy, concrete language for cognitive components, longer habituation periods, careful avoidance of exposures that target autistic regulatory behaviors (not OCD), and integration of sensory accommodations throughout treatment.
A critical safety consideration: ERP must never be applied to behaviors that serve an autistic regulatory function. Forcing an autistic person to "resist" stimming, routine adherence, or sensory avoidance that is not OCD-driven can cause significant harm. The assessment phase must clearly distinguish OCD targets from autistic needs before any exposure work begins.
Ontario has a small number of clinicians trained in both OCD and autism. The Frederick W. Thompson Anxiety Disorders Centre at Sunnybrook Health Sciences Centre in Toronto offers OCD treatment and has experience with neurodivergent patients. CAMH provides assessment and treatment through its Autism and Dual Diagnosis program. McMaster Children's Hospital in Hamilton offers pediatric OCD services.
Private OCD therapists trained in ERP are available through the Canadian OCD Network directory. Sessions typically cost $175-$275. Some private insurance plans cover psychological services. The Ontario Structured Psychotherapy (OSP) program may provide access to CBT-based OCD treatment at no cost, though autism-adapted ERP is not specifically guaranteed.
Postorino, V. et al.
Systematic Review: Relationship Between Obsessive-Compulsive Disorder and ASD. Journal of Autism and Developmental Disorders, 2017; 47:2456-2473
Ruzzano, L. et al.
Repetitive Behaviours in Autism and OCD: New Perspectives from a Network Analysis. Research in Autism Spectrum Disorders, 2015; 19:39-47
Russell, A.J. et al.
CBT for Comorbid OCD in High-Functioning ASD: A Randomized Controlled Trial. Journal of Autism and Developmental Disorders, 2013; 43:1070-1082
Written by Spencer Carroll
Founder & Autism Advocate
Evidence on this page
Key claims are paired with their source, evidence tier, and verification date so readers can inspect the public record directly.
1 in 50
According to the 2019 Canadian Health Survey on Children and Youth, about children and youth aged 1 to 17 in Canada had an autism diagnosis
89,799
children are registered in the Ontario Autism Program
WHO recommends accessible, community-based early interventions for children with autism — timely evidence-based psychosocial interventions improve communication and social engagement
23%
Only 20,633 children have active funding agreements — less than one in four