Distinguishing OCD from Autism

Key Diagnostic Distinctions

The American College of Neurology and Psychiatry recommends that in a patient with excessive rumination but no compulsions, carefully assess whether the rumination is ego-dystonic (unwanted, anxiety-provoking) pointing toward OCD, or ego-syntonic (comfortable, part of their routine) suggesting autism spectrum disorder (ASD), with high levels of distress and impairment associated with OCD 1, 2
OCD rumination is experienced as intrusive, unwanted, and causes marked anxiety or distress that the individual actively attempts to suppress or neutralize, with the individual recognizing these thoughts as excessive or unreasonable, according to the International Society for the Study of Trauma and Dissociation 1, 3
OCD obsessions typically involve themes of contamination, harm, symmetry, or forbidden thoughts that are perceived as threatening, with the individual feeling driven to perform mental acts to reduce anxiety, as stated by the National Institute of Mental Health 1
Severe OCD may secondarily impair social and communication functioning, although OCD alone does not cause primary social-communication deficits, as noted by the American Psychiatric Association 1

The assessment of rumination should include questions about the emotional valence and distress associated with the thoughts, such as "Do these thoughts feel like they're intruding against your will, or are they topics you enjoy thinking about?" and "Do these thoughts cause you anxiety or distress, or do they feel comforting?", with the individual's response informing the diagnosis of OCD or ASD 1, 3
The evaluation of mental acts, such as counting, praying, or repeating words silently, is critical in assessing for OCD, as these behaviors may be performed rigidly in response to obsessions or to prevent dreaded outcomes, according to the International OCD Foundation 1, 3
The Yale-Brown Obsessive Compulsive Scale (Y-BOCS) can be used to quantify the severity of OCD symptoms, with scores ≥14 for obsessions alone indicating clinically significant OCD, as recommended by the American Psychological Association 3, 4

If OCD is diagnosed, the American Academy of Child and Adolescent Psychiatry recommends initiating Cognitive Behavioral Therapy with Exposure and Response Prevention (ERP) as first-line treatment, with sertraline 50 mg daily considered as first-line SSRI pharmacotherapy for moderate-to-severe symptoms 4

Reassurance-seeking is a common compulsion in OCD that follows a specific pattern, characterized by short-lived relief, multiple forms, and adverse relational impact, as noted by the International OCD Foundation 5, 6
Individuals with OCD may exhibit reassurance-seeking behaviors, including questioning others, self-reassurance, confessing to others, and compulsive internet searching, according to the American Psychological Association 5
Excessive demands for reassurance can negatively affect family members and friends, as reported by the National Alliance on Mental Illness 5

The American Psychiatric Association recommends assessing the nature of thoughts, including whether they are intrusive, unwanted, and anxiety-provoking, to determine OCD vs. anxiety disorder 7
The International Society for Traumatic Stress Studies suggests evaluating the questioning behavior, including whether it is performed as a rigid compulsion to neutralize specific obsessive fears or driven by genuine uncertainty and a desire for information 7, 8
The National Institute of Mental Health recommends examining insight and distress, including whether the individual recognizes the questioning as excessive and feels unable to stop, to determine the presence of OCD 7, 8

The American College of Psychiatrists notes that if anxiety disorder is diagnosed, treatment may include SSRIs, cognitive-behavioral therapy focused on anxiety management and trauma processing, and addressing underlying attachment concerns and relationship security 6
The Obsessive Compulsive Foundation recommends that if OCD is confirmed, treatment may include Exposure and Response Prevention (ERP), SSRIs at higher doses, and focusing on preventing reassurance-seeking compulsions 5