What Causes Autism? A Heartfelt Look from an ABA Therapist

• April 25, 2025
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What Causes Autism? A Heartfelt Look from an ABA Therapist

As an ABA therapist who has worked closely with dozens of incredible children and their families, I often hear the same question from parents, sometimes whispered through tears and sometimes asked outright: “What causes autism?”

I want you to know that asking that question comes from a deep place of love — a desire to understand your child better, to support them fully, and to make sense of a diagnosis that can feel overwhelming at first.

Today, I want to walk you through what we know (and what we don’t know yet) about the causes of autism, based on both research and my real-world experience.

Understanding Autism: Not One Cause, But Many Factors

Autism Spectrum Disorder (ASD) is complex. It’s not caused by one single thing, and it certainly isn’t caused by anything a parent did or didn’t do.
Research suggests that autism develops from a combination of factors that influence early brain development, including:

Genetic Factors

Many studies show that genetics play a big role. Some important things to know:

• Family history matters: If one child has autism, there’s a higher chance a sibling might, too.
  
• Gene variations: Certain rare gene changes (mutations) are strongly associated with autism.
  
• No single “autism gene”: It’s more likely a combination of genetic changes rather than one gene causing autism.

In my work, I’ve met families where multiple members are on the spectrum in beautifully unique ways — highlighting just how much genetics can weave through generations.

Environmental Influences

While genes set the stage, certain environmental factors during pregnancy and early development might increase the likelihood of autism:

• Prenatal exposures: Certain medications or infections during pregnancy have been associated with higher autism risks.
  
• Parental age: Older parents may have a slightly higher chance of having a child on the spectrum.
  
• Birth complications: Low birth weight or early birth can sometimes play a role.

It’s important to understand that these factors don’t “cause” autism directly. They may just slightly influence the odds, like tiny puzzle pieces that come together in a way we don’t fully understand yet.

Brain Development Differences

Advances in brain imaging have shown that children with autism often have differences in how their brains develop and connect:

• Brain growth: Some autistic children show very rapid brain growth in the first years of life.
  
• Neural pathways: Differences in how brain areas communicate can impact social interaction, language, and behavior.

Every autistic child I work with shows their own unique patterns of strengths and challenges, a reminder that no two autistic brains are exactly alike.

Common Myths About What Causes Autism

Let’s clear up a few misunderstandings I still hear from parents and caregivers:

• Vaccines do not cause autism. Extensive research from around the world has confirmed this.
  
• Parenting styles do not cause autism. You did not cause this by how you parent.
  
• Autism is not a tragedy. It’s a different way of experiencing and interacting with the world.

Understanding these truths allows families to focus their energy on support, growth, and connection — not guilt.

After working with so many wonderful children at all different points on the spectrum, one thing is clear to me: autism isn’t about less, it’s about different. Different ways of seeing, thinking, feeling, and connecting.

At Kids N Heart, we believe every child deserves to thrive in an environment where they feel understood, respected, and empowered. If you’re seeking answers or wondering how to best support your child through ABA therapy in North Carolina, we’d love to walk this journey with you.

Learn more about how our therapy services can help your child unlock their full potential, in their own time, in their own way. Contact us today!

Frequently Asked Questions

Can stress during pregnancy cause autism?

Stress alone isn’t considered a direct cause of autism. However, extreme stress combined with other factors might influence early brain development in ways we don’t fully understand yet.

Is autism always inherited from a parent?

While genetic factors are strong, not every case of autism can be traced back to a direct family link. Sometimes, genetic changes happen spontaneously during early development.

Can you prevent autism?

There’s currently no way to prevent autism, and importantly, autism is not something that needs preventing. What matters most is early support, acceptance, and celebrating each child’s individuality.

Sources:

• https://medschool.ucla.edu/news-article/is-autism-genetic
  
• https://www.medicalnewstoday.com/articles/what-causes-autism
  
• https://www.uclahealth.org/news/release/new-genetic-clues-uncovered-largest-study-families-with
  
• https://www.mayoclinic.org/diseases-conditions/autism-spectrum-disorder/symptoms-causes/syc-20352928
  
• https://medlineplus.gov/genetics/condition/autism-spectrum-disorder/