As autism presents unique challenges in the lives of children and their families, one of the first questions parents may ask themselves after receiving their child’s diagnosis is what might have caused their child’s autism spectrum disorder (ASD).
In this article, we’ll explore the current scientific understanding of autism’s causes, including genetic, environmental, and neurological factors. We’ll also provide the most effective ASD approaches.
By examining both what we know and what researchers are still discovering, we aim to provide you with clear, evidence-based information to help you better understand your child’s journey.
What Is Autism?
To understand the causes, let’s first define the outcome.
Autism, also known as Autism Spectrum Disorder (ASD), is a complex neurological disorder that remains a topic of profound interest and extensive research in the medical community.
The term autism refers to a range of conditions characterized by:
- Challenges with social skills
- Repetitive behaviors
- Verbal and non-verbal communication
- Restricted interests
- Sensory sensitivity
According to the World Health Organization, approximately one in 100 children worldwide has autism. The US autism statistics report that 1 in 31 children is diagnosed with ASD.
Many parents struggle with their autistic child’s diagnosis due to the misconceptions and stigma surrounding the ASD. It’s essential to recognize that autism is not a disease but a developmental disorder. People with autism perceive and interact with the world differently, which can lead to challenges in traditional learning and social environments.
However, many autistic individuals demonstrate unique problem-solving abilities and a high attention to detail, which can help them navigate life in their own way. They may also exhibit profound creativity, expressing themselves through art, which enhances their motor and cognitive skills.
What Are the Causes of Autism?
Current research indicates that there’s no single cause of autism. Instead, a combination of genetic and environmental factors likely contributes to brain development in ways that result in autism.
Let’s explore each of the contributing factors.
Genetic Causes of Autism
The connection between autism and genetics is extremely complex, with new research and studies moving the boundaries as we speak. Here, we’ve prepared some basic facts about genetic causes of autism that we believe will be most helpful to parents that are in need of a basic understanding of the genetic component and ASD.
- As of today, over 100 genes have been identified to contribute to autism spectrum diagnosis. What’s more, certain scientists claim up to 1,000 genes can have a role in causing autism.
- A family history is a significant factor in determining risk. Whether autism comes from a mother or father is often discussed since about 80% of autism cases can be connected to inherited genetic mutations.
- However, while autism is hereditary, an inherited genetic mutation is not always the cause of autism. It’s also possible for autism to occur as a consequence of a de novo mutation. A de novo mutation is a genetic mutation that appears in a family, i.e. the genetic code for the first time.
For instance, a parent’s cell (a sperm cell/an egg) could suffer an unusual change that has never occurred before, leading to ASD. About 10% of individuals with autism are born in families without any mentions of ASD in the family history, which is a possible indicator of de novo mutations.
- Some cases of autism are linked to specific genetic conditions, such as Fragile X syndrome or Rett syndrome
- Researchers are investigating particular chromosomes, especially anomalies in Chromosome 15, to better understand the genetic underpinnings of autism.
- Genetic mutations can occur after the child’s birth, as certain genes interact later in life. According to the new Princeton study on autism, this is very common for the Social and Behavioral Challenges subtype of autism (recently discovered), which normally receives an ASD diagnosis later than other three subtypes identified in the study. In contrast, children belonging to the Broadly Affected autism subtype have the highest proportion of harmful de novo mutations.
As it was emphasized by Jennifer Foss-Feig, a clinical psychologist at the Seaver Autism Center for Research and Treatment and a co-author of the above study, a better understanding of genetic autism causes is crucial since it can lead to more targeted monitoring and tailored support at home and school, helping families lead healthier and happier lives.
With the newest findings about genetic causes of autism, we can look forward to overall better understanding of the autism spectrum puzzle and more effective ways to nurture each child’s unique strengths and well-being.
Environmental Causes of Autism
Environmental influences, particularly during prenatal development, may also play a role. Researchers are examining how factors like maternal nutrition, stress levels, and exposure to certain substances (air pollution, pesticides) during pregnancy might influence autism risk, as well as certain medications during pregnancy.
Neurological Factors
Research has identified three common neurological factors that often accompany ASD and may contribute to its clinical presentation:
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- Epilepsy
- Sleep disorders
- Motor coordination differences
Understanding these potential causes is crucial not only for advancing research but also for helping families develop effective support strategies for their children.
Addressing Controversial Theories
Claims suggesting that acetaminophen (Tylenol) causes autism have sparked debates. While some research suggests a possible association between frequent use during pregnancy and neurodevelopmental differences, no definitive cause-and-effect relationship has been established so far, as other studies do not find the connection between acetaminophen and autism, and the Tylenol autism lawsuits were ruled out in 2023.
The theory linking vaccines to autism has been thoroughly investigated and consistently disproven by numerous large-scale, well-designed studies. Major health organizations, including the Centers for Disease Control and Prevention (CDC) and the World Health Organization, have repeatedly confirmed that vaccines do not cause autism.
Yet, despite extensive research finding no link between vaccines and autism, misconceptions persist. This highlights how important evidence-based information is when making healthcare decisions for our children.
Supporting Your Child: Effective Approaches
While understanding causes is important, focusing on effective support strategies is often more immediately helpful for families. Evidence-based approaches can help children with autism develop skills and navigate challenges:
Behavioral Approaches
- Applied Behavior Analysis (ABA) focuses on understanding how learning works and using that knowledge to help children develop communication, social interaction, and learning skills.
- Early Start Denver Model (ESDM), designed for younger children (12-48 months), blends ABA strategies with play-based interaction. It helps build speaking, social, and learning abilities through natural, fun activities.
Educational Approaches
- Programs like the Treatment and Education of Autistic and Related Communication-Handicapped Children (TEACCH) use visual support and organized environments to enhance learning and support independence.
Social-Relational Approaches
- Floortime and Relationship Development Intervention (RDI) focuses on a family-based approach to building social and emotional connections.
Occupational and Physical Therapies
- These therapies aim to improve everyday skills and physical coordination. Might also include sensory integration therapy to help with sensory sensitivities.
Psychological Support
- Cognitive-Behavioral Therapy (CBT) is particularly helpful for older children and adolescents with anxiety, depression, or other co-occurring conditions.
Medication
- While there’s no medication for core autism features, some medications can help manage co-occurring conditions like anxiety, ADHD, or sleep disturbances when appropriate. At the moment, there are two FDA-approved drugs that are prescribed for common conditions in children on the spectrum: Risperidone (Risperdal, Risperdal Consta) and Aripiprazole (Abilify). Both can be prescribed for autism-associated irritability, but they’re used for other conditions as well, such as bipolar disorder.
The effectiveness of these approaches varies from child to child. Working closely with healthcare providers to develop a personalized support plan is essential for maximizing your child’s potential.
Moving Forward Together
What we know with certainty is that autism results from a combination of genetic, environmental, and neurological factors that influence brain development.
As research progresses, we’re gaining valuable insights not only about causes but also about the most effective ways to support children with autism.
Understanding the complexity of autism helps us approach each child with the depth, sensitivity, and personalized care they deserve.
FAQs
What are the main causes of autism?
It is believed that the main autism causes are a combination of genetic, biological, and environmental factors.
Are you born with autism or is it caused?
Autism is a condition people are born with, determined by a combination of genetic and environmental factors that affect early brain development. However, we need to emphasize that certain genetic mutations are time-affected and appear later in life.
It’s important to understand that autism is not a mental illness and is not caused by any post-birth events. Although autism may become more apparent later in life, especially in cases of high-functioning autism or Asperger’s syndrome, this delayed recognition is due to the wide spectrum of symptoms and their severity.
Why is autism so common now?
The increased number of autism diagnoses is attributed to better awareness, broader diagnostic criteria, and improved screening methods. In other words, it’s not necessarily due to an actual increase in the number of cases but rather due to better detection and understanding of the spectrum.