who said tylenol causes autism

No specific single scientist or doctor is credited with the phrase “Tylenol causes autism.” The idea comes from a mix of older speculative research, recent lawsuits, and, most prominently, public comments by political figures, especially Donald Trump in 2025.

Who actually said Tylenol causes autism?

A few key players pushed this into the spotlight:

• Donald Trump (current U.S. president) publicly claimed in September 2025 that Tylenol (acetaminophen) is “a very big factor” in autism and urged pregnant women to avoid it or use it only sparingly.

• At a White House event on 22 September 2025, Trump and his health team framed acetaminophen as a major autism risk and advised expectant mothers to “tough it out” rather than take the drug.

• These remarks were amplified by allies like Robert F. Kennedy Jr. and other contrarian medical commentators who appeared with Trump and echoed or reinforced the message that Tylenol use in pregnancy is strongly linked to autism.

So if you’re asking “who said Tylenol causes autism?” in the sense of who turned this into a loud, public claim, the answer is: Donald Trump and his circle of advisers and advocates in 2025 , drawing on a narrow selection of studies and expert witnesses tied to ongoing lawsuits.

Where the idea came from (before Trump)

Before it became a political talking point, there were:

• Observational studies : Some research (for example, a 2020 JAMA Psychiatry study) reported a statistical association between acetaminophen use in pregnancy and increased risk of diagnoses like autism or ADHD in children.

• Tylenol lawsuits : Starting around 2022, hundreds of lawsuits claimed that in‑utero exposure to acetaminophen caused autism or ADHD, arguing that manufacturers failed to warn pregnant users.

• Expert witnesses : One heavily cited researcher, Dr. Andrea Baccarelli, wrote a paper that the Trump team leaned on; he had also been paid as an expert in Tylenol litigation.

These studies and legal arguments did not create a consensus that “Tylenol causes autism,” but they seeded the narrative that Trump later amplified into a simple, causal claim.

What major medical evidence says right now

Current high‑quality evidence does not support the statement “Tylenol causes autism”:

• A large 2024 Swedish study of about 2.5 million children found no causal link between maternal acetaminophen use and autism when using stricter methods like sibling comparisons.

• Reviews by independent scientists conclude that the better‑controlled studies show, at most, small associations likely driven by confounding factors (other differences between families who do and don’t use the drug), not by the drug itself.

• Commentaries in medical and science outlets explicitly state that autism is not caused by Tylenol and warn that the “Tylenol causes autism” narrative is bad science and bad policy.

• In late 2024, a federal judge dismissed the main Tylenol autism lawsuits, ruling that the plaintiffs’ expert testimony did not meet scientific standards.

In short: there is no solid scientific proof that Tylenol causes autism , and leading researchers and courts have pushed back on that claim.

Why people are talking about it online

If you’re seeing a lot of chatter like “Tylenol causes autism” on forums or social media, several things are feeding it:

• News and politics : The 2025 Trump press conference and follow‑up coverage in major outlets triggered a wave of posts, podcasts, and newsletter debates.

• Ads and lawsuit campaigns : For years, legal ads have hunted for potential plaintiffs by suggesting that Tylenol or generic acetaminophen used during pregnancy might be to blame for a child’s autism or ADHD.

• Parent anxiety : In parenting and “mom” communities, any hint of a possible risk can spread fast; posts often conflate correlation and causation (if two things happen together, people assume one caused the other).

One Reddit thread from 2023, for example, shows users asking “Why is everyone saying Tylenol causes autism nowadays?” and others replying that people are misreading studies and legal ads, and that correlation does not equal causation.

Bottom line

• The loud, headline‑level claim that “Tylenol causes autism” is most closely associated with Donald Trump’s 2025 public statements , backed by a small group of litigation‑linked experts and political allies.

• Major scientific reviews and large population studies do not support that Tylenol actually causes autism, and many doctors and researchers are actively trying to correct that misconception.

Information gathered from public forums or data available on the internet and portrayed here.