With autism diagnoses on the rise in Australia, misinformation about its causes has also grown—fuelled in part by social media, fear, and outdated science. A recent Evidence Brief from the Australian Academy of Health and Medical Sciences (AAHMS) provides clear guidance based on current, high-quality research: there is no evidence that vaccines or paracetamol cause autism.
This article helps unpack the science so you can understand the facts and the actual risks .
What Causes Autism?
Autism Spectrum Disorder (ASD) is a neurodevelopmental condition that affects communication, social interaction and behaviour. It usually becomes evident in early childhood and varies widely from person to person.
Current science confirms that autism arises from a complex mix of genetic and environmental factors, most of which influence brain development before birth.
- Genetic links are the strongest factor—hundreds of genes have been associated with autism.
- Environmental factors, such as advanced parental age or certain pregnancy-related health conditions, may have weak associations, but not causal links.
It’s important to remember: association does not amount to causation.
Paracetamol and Autism: What the Science Says
Paracetamol (also known as Panadol or acetaminophen) is commonly used during pregnancy to reduce fever and manage pain. Some studies have shown a weak correlation between antenatal paracetamol use and autism—but correlation is not causation.
When researchers look deeper—particularly at sibling studies—they find no difference in autism rates between children exposed and not exposed to paracetamol in utero. This suggests that other factors, like genetics or maternal illness, are more likely to explain the observed associations.
Regulators like the Therapeutic Goods Administration (TGA) continue to recommend paracetamol during pregnancy when needed, especially since untreated fever can pose real risks to the developing baby.
Vaccines Do Not Cause Autism
One of the most persistent myths is the belief that vaccines—especially the MMR (measles, mumps, rubella) vaccine—cause autism. This myth dates back to a fraudulent and now-retracted 1998 study, which has been wholly discredited.
Since then, millions of children across the world have been studied in systematic reviews, meta-analyses, and national registry studies. The conclusion is consistent and strong: vaccines do not cause autism.
A 2019 Danish study of over 650,000 children found no increased risk of autism after MMR vaccination—even among children considered genetically vulnerable. Other studies examining vaccine ingredients like thimerosal and aluminium have also found no links to autism.
Why the Myth Persists
The idea of a connection between vaccination and autism continues partly because autism symptoms often appear around the same time children receive vaccines. This coincidence of timing has led some to wrongly assume causation.
Additionally, media coverage of now-debunked studies and anti-vaccine movements have prolonged the myth, despite overwhelming evidence to the contrary.
Why It Matters
Misinformation about autism can lead to delayed or reduced participation in getting vaccinations, putting both children and the wider community at risk of preventable diseases like measles and rubella. It also distracts from the real needs of autistic individuals and their families—such as timely diagnosis, support, and inclusion.
As the AAHMS Evidence Brief concludes: it’s time to move past myths and focus on the facts.
DISCLAIMER
This article reflects the current science and law at the time of publication. It is intended for informational purposes only and does not constitute legal advice. The actual decisions in each case are summarised for general understanding. For specific legal guidance in relation to your situation, please consult with a qualified legal professional.