Nine times more likely to be diagnosed with anxiety or depression, and far less likely to be treated.
By Mercyland Healthcare Inc. – May 2026
At Mercyland Healthcare Inc., we believe every person, regardless of ability, deserves access to compassionate, high-quality mental health care. Yet for the more than 7.4 million Americans living with Intellectual and Developmental Disabilities (IDD), mental health struggles are not just more common: they are more severe, more frequently missed, and more consistently undertreated. Understanding why this happens is the first step toward changing it
What the Numbers Tell Us
The data on mental health outcomes for people with IDD is striking. A landmark 2026 study published in JAMA Network Open — drawing on U.S. National Health Interview Survey data from over 44,000 adults — found that adults with IDD are more than nine times as likely to be diagnosed with anxiety or depression compared to adults without functional limitations. And when researchers looked at daily symptoms, the picture became even more stark.
25% of adults with IDD report daily depressive symptoms (vs. just 1.4% in the general population)
9 times more likely to have an anxiety or depression diagnosis
21–34% of adults with IDD experience mental health disorders, per a scoping review
49% less likely to be diagnosed with depression when participating in programs like Special Olympics
These numbers reflect a population in genuine crisis, one that is too often invisible to healthcare systems and policymakers alike. As Dr. Dimitri Christakis, Chief Health Officer of Special Olympics, put it: adults with IDD are facing “a mental health crisis hiding in plain sight.”
Why Are People with IDD More Vulnerable?
The higher prevalence of mental health conditions among people with IDD is not coincidental. It stems from a convergence of biological, social, and systemic factors that compound one another over a lifetime.
Neurological and Biological Factors
Many individuals with IDD have underlying neurological differences that increase vulnerability to mood disorders, anxiety, and other psychiatric conditions. Elevated rates of severe mental illnesses — including bipolar disorder, psychosis, and schizophrenia — are well-documented in this population, likely reflecting genetic and neurobiological overlap between IDD and psychiatric conditions.
Social Exclusion and Stigma
People with IDD frequently experience stigma in both social and healthcare settings. This stigma, manifesting as exclusion, biased attitudes, and unfair treatment, can directly fuel isolation, loneliness, and low self-esteem, which are themselves powerful drivers of depression and anxiety. When someone is treated as lesser, they often begin to believe it.
Poverty and Socioeconomic Stress
IDD is strongly associated with economic disadvantage. Financial insecurity compounds mental health risk significantly, limiting access to nutrition, stable housing, and social participation — all foundational to emotional well-being.
Communication Barriers
Many individuals with IDD experience difficulties expressing emotional distress verbally. This means that anxiety, depression, and other conditions may go unrecognized for far longer than they would in neurotypical individuals, allowing symptoms to become entrenched before support is sought or offered.
A System That Was Not Built for Them
Even when mental health conditions are identified, people with IDD face persistent and often insurmountable barriers to care. Some mental health facilities have strict admission requirements that exclude individuals with IQ scores below 70 — effectively locking out the very people who need support most. Cost is another critical hurdle: many individuals with IDD delayed or declined mental health care due to affordability concerns, even when their need was evident.
The healthcare system’s fragmentation compounds these challenges further. Mental health benefits are often separated from primary care coverage, creating confusion and gaps for patients and providers alike. For individuals with IDD who already navigate complex care landscapes, this additional bureaucracy can be a dealbreaker.
At Mercyland Healthcare Inc., we work alongside individuals with IDD and their caregivers to bridge these gaps — providing person-centered, culturally responsive mental health support that meets people where they are.
What Makes a Difference
The good news is that effective, evidence-backed interventions exist. Supportive communities, physical activity, and structured social connection have all been shown to reduce depression and anxiety in people with IDD meaningfully.
Other approaches that have shown promise include:
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Disability-informed therapy adapted for different communication needs
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Caregiver education and mental health support for families and direct support professionals
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Integrated care models that treat physical and mental health together
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Community inclusion programs that combat isolation and build self-worth
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Telehealth services that reduce transportation and accessibility barriers
At Mercyland Healthcare Inc., we are committed to expanding access to all of these approaches for our clients and community members across Washington, DC.
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Follow @mercyland_healthcare for more stories from our community, and reach out to learn about our services. Call us: 202-525-1563. Visit: mercylandhi.com
