Autism and Depression: Identification and Support in Ontario

Among autistic people, those without intellectual disability appear to be at higher risk of depression, possibly because of greater awareness of social exclusion and unmet expectations.

Underdiagnosis occurs for several reasons. Standard depression screening tools (PHQ-9, BDI-II) have not been validated for autistic populations. Questions about "loss of interest in activities" may not capture autistic depression, where special interests sometimes intensify rather than diminish. Clinicians may attribute depressive symptoms to "autism itself," a phenomenon called diagnostic overshadowing.

In Ontario, family physicians often start the mental health referral process. Many may have limited training in recognizing depression in autistic patients.

Alexithymia is difficulty recognizing and describing one's own emotional states. This creates a significant barrier to depression detection. An autistic person with alexithymia may not be able to report "feeling sad" even when experiencing severe depression. They may instead report physical symptoms: fatigue, pain, appetite changes, or sleep disruption.

Clinicians assessing for depression in autistic individuals should use behavioral indicators alongside self-report. Changes in routine engagement, special interest patterns, self-care, sleep-wake cycles, and communication frequency can signal depression even when the individual cannot verbally report mood changes. Caregiver input is particularly valuable for identifying these shifts.

Cognitive Behavioural Therapy (CBT) adapted for autism shows moderate effectiveness for autistic depression. Adaptations include concrete rather than abstract language, written materials to supplement verbal discussion, structured sessions with visual agendas, longer treatment courses (20+ sessions vs. standard 12-16), and integration of special interests into therapeutic activities.

Medication decisions should be made with a qualified prescriber. Ask about benefits, side effects, starting dose, monitoring, and autism-related sensitivities. Autism expertise may be harder to access outside major centres.

Ask about structured psychotherapy, community mental health, telephone coaching, and crisis supports. Confirm eligibility, cost, wait times, and whether staff have autism training.