ASD is frequently associated with anxiety and depression because the neurological differences, communication challenges, and social difficulties that come with autism create real, ongoing stressors, and because there may also be a shared genetic link between ASD and mood disorders. Research suggests that up to two-thirds of autistic individuals also receive at least one additional psychiatric diagnosis. Understanding this overlap is critical for families, educators, and behavior analysts working to support the whole person.
If your child or client has autism, you’ve probably noticed that anxiety and depression often seem to travel alongside it. That’s not a coincidence, and it’s not a failure of treatment. It’s a pattern researchers have studied for decades, and one applied behavior analysts consider every day.
The good news is that we know a lot about why this happens and what helps. Here’s a clear look at the science, the challenges, and the most effective approaches.
Why ASD and Mood Disorders So Frequently Co-Occur
The short answer is: it’s complicated, and researchers still don’t have the full picture. But here’s what we do know.
First, there’s a possible genetic link. A 2013 study published in The Lancet identified shared genetic markers between ASD and several other psychiatric conditions, including major depression and anxiety disorders. This suggests it’s not always purely circumstantial. Some of the same biological factors that contribute to autism may also increase vulnerability to mood disorders.
Second, there’s the lived experience factor. Think about what daily life looks like for many autistic individuals: sensory environments that can feel overwhelming, difficulty reading social cues, challenges communicating needs, and the constant effort of navigating a world that wasn’t designed with them in mind. It’s not surprising that anxiety and depression can develop in that context. For high-functioning autistic individuals, especially, the more aware someone is of the gap between themselves and their neurotypical peers, the more likely they are to struggle emotionally.
Research suggests that around two-thirds of autistic individuals receive at least one additional psychiatric diagnosis at some point in their lives [JAMA Pediatrics, 2013]. Anxiety disorders are the most common, followed by depression.
Why Diagnosis Is So Difficult
Here’s where things get really tricky: many of the behavioral signs of anxiety and depression in autistic individuals overlap with the core symptoms of ASD itself.
Preferring to be alone? That might be depression, or it might just be how someone with ASD prefers to recharge. Strong reactions to sensory input? That could be anxiety, or it’s a typical sensory processing profile for that person. Difficulty expressing emotions? Could be both at once, or neither.
This overlap creates real diagnostic challenges. Some experts argue that anxiety and depression are overdiagnosed in autistic patients because clinicians apply neurotypical standards to behaviors that have completely different meanings in an autistic context. Others point out that underdiagnosis is just as real a problem, especially for individuals who have been taught to mask their emotional distress. Research in JAMA Psychiatry (2015) has highlighted how this symptom overlap makes it hard to know whether a behavior reflects a mood disorder, the baseline for that individual, or both.
The bottom line is this: any assessment for mood disorders in an autistic individual needs to be conducted by someone with genuine expertise in ASD. A checklist designed for neurotypical patients won’t suffice.
Treatment Options: What Actually Works
Treatment for co-occurring anxiety and depression in ASD is challenging, but there are effective paths forward.
Cognitive behavioral therapy (CBT) is the gold standard non-medication treatment for anxiety and depression in the general population. The catch is that CBT relies heavily on verbal communication and abstract self-reflection, two areas that are often difficult for autistic individuals. That said, adapted versions of CBT designed for people with ASD have shown real promise, particularly when combined with visual supports and concrete, structured approaches.
Medication is often part of the picture. SSRIs (selective serotonin reuptake inhibitors) like sertraline are frequently prescribed and can also reduce obsessive-compulsive behaviors in some individuals with ASD. Families should work closely with a psychiatrist who has experience with autistic patients, since medication interactions and side effects can be more complex in this population. Learn more about why OCD is so common in children with autism and how it relates to treatment decisions.
Applied behavior analysis plays a meaningful role here, too. Some studies suggest that ABA techniques like graduated exposure and contingency management may help with anxiety symptoms in autistic individuals, though research is still emerging and not yet as robust as for core ASD behaviors. ABA practitioners don’t need a definitive psychiatric diagnosis to help. Their behavioral approach is effective for supporting emotional regulation and daily functioning across a range of underlying conditions. For a deeper look at the behavioral approach, see how ABA treats anxiety disorders.
What This Means for Families and Practitioners
If you’re a parent, the most important thing you can do is advocate for a thorough evaluation by a professional who understands both ASD and mood disorders. Don’t dismiss signs of anxiety or depression as “just autism.” They may be both, and both deserve attention.
If you’re an ABA practitioner or student, keep in mind that your approach to behavioral challenges is likely to be similar whether the root cause is ASD, anxiety, depression, or some combination. The behavioral lens you bring (observing, measuring, responding to what’s actually happening) is one of the most practical tools available for this population. You can explore ABA’s role in treating depression to understand how these approaches carry over into mood disorder work.
The goal is always to help the individual thrive in their daily life. That starts with understanding the full picture of what they’re dealing with.
Frequently Asked Questions
How common is anxiety in autistic people?
Anxiety is the most common co-occurring condition in autism. Research estimates suggest that anywhere from 40% to 80% of autistic individuals experience significant anxiety at some point, though exact numbers vary depending on how anxiety is defined and assessed in each study.
Can autism cause depression?
Autism doesn’t directly cause depression, but the challenges associated with ASD: social isolation, sensory overload, communication difficulties, and the experience of feeling different, can contribute to it. There’s also evidence of a shared genetic component between ASD and mood disorders, meaning some individuals may have a biological predisposition to both.
Why is it hard to diagnose depression in autistic individuals?
Many symptoms of depression, like social withdrawal or flat affect, overlap with common characteristics of ASD. This makes it hard to know whether a behavior reflects a mood disorder, the baseline for that individual, or both. Assessment should always be done by clinicians experienced in evaluating autistic patients.
Is ABA therapy used to treat anxiety in autism?
Yes, though the research base is still developing. ABA techniques, including graduated exposure and contingency management, show promise for addressing anxiety symptoms in autistic individuals. ABA practitioners focus on observable behavior and on building functional skills, which are effective regardless of the underlying diagnosis.
Should my autistic child see a psychiatrist?
If you’re noticing signs of persistent sadness, withdrawal, intense fear, or other mood-related changes in your child, a consultation with a psychiatrist who specializes in ASD is worth pursuing. They can help determine whether medication, therapy, or a combination approach is appropriate.
Key Takeaways
- High co-occurrence rates: Research suggests that around two-thirds of autistic individuals receive at least one additional psychiatric diagnosis, with anxiety and depression being the most common.
- Diagnosis is complicated: Overlapping symptoms between ASD and mood disorders make accurate diagnosis difficult — it requires clinicians with specific expertise in both areas.
- Multiple treatment paths exist: Adapted CBT, medication, and ABA all have evidence-based roles in treating co-occurring mood disorders in autism.
- ABA works across diagnoses: Behavior analysts don’t need a definitive psychiatric label to help — their focus on observable behavior and skill-building is effective regardless of the underlying condition.
- Advocacy matters: Families should push for comprehensive evaluations and not dismiss mood-related changes in autistic individuals as simply part of the diagnosis.
Ready to explore how ABA professionals support individuals with autism and co-occurring conditions? Browse ABA degree programs and career paths to learn more about this growing and rewarding field.
