A false sense of protection kept them in the sun longer
In the long human struggle to separate fear from fact, a misread scientific study has become a vessel for a familiar kind of doubt — the kind that travels faster than its correction. Researchers who examined sunscreen use and skin cancer rates in a large UK cohort found not that sunscreen causes harm, but that those who use it often do so improperly, spending more time in the sun with a false sense of safety. The scientists themselves have been clear: proper sunscreen use reduces cancer risk. What lingers is a quieter concern — not that falsehood has conquered the conversation, but that when it appears, it burns unusually bright.
- A viral claim on X and TikTok is telling millions of people that sunscreen causes skin cancer, weaponizing a real 2023 study to say the opposite of what its authors concluded.
- The actual finding — that frequent sunscreen users had higher cancer rates — reflects a behavioral trap: more time in the sun, less reapplication, and a dangerous illusion of full protection.
- Dr. Ivan Litvinov, the study's senior author, has publicly named this the 'sunscreen paradox' and stated plainly that proper sunscreen use, combined with other protective measures, lowers cancer risk.
- A separate analysis of nearly 1,000 TikTok videos found that contrarian sunscreen content, though rare, attracted dramatically higher engagement than accurate, pro-sunscreen videos.
- The danger is not a platform overrun by misinformation — it is that the misinformation present ignites with disproportionate intensity among those it reaches.
A claim spreading across X and TikTok asserts that sunscreen raises the risk of skin cancer, pointing to a November 2023 study as its evidence. What the viral posts omit is what the researchers actually found — and what they have since taken pains to explain.
The study, drawn from a large UK Biobank cohort, did identify an association between frequent sunscreen use and higher skin cancer rates. But the cause was behavioral, not chemical. Sunscreen users tended to spend more time outdoors, often failed to reapply throughout the day, and developed a false confidence that led them to skip other protective habits. In some cases, people began using sunscreen more frequently only after receiving a skin cancer diagnosis — meaning the disease preceded the behavior, not the other way around.
Dr. Ivan Litvinov of McGill University, a senior author of the study, described this as the 'sunscreen paradox.' He explained that some users treat sunscreen as a license to linger in the sun without adequate precaution. The study's own conclusion was unambiguous: proper sunscreen use, paired with other sun-safety measures, reduces the risk of skin cancer.
Meanwhile, a separate study published in PLOS Digital Health examined nearly a thousand TikTok videos about sunscreen and found that the majority promoted its use. Only a small fraction were critical, and fewer still made outright harmful claims. But those contrarian videos generated significantly more engagement — more likes, shares, and comments — than the accurate ones. The researchers noted that critical content can attract outsized attention even when it represents a minority of voices. The broader conversation has not been overtaken by falsehood, but when falsehood does appear, it spreads with unusual force.
A claim has been circulating across social media platforms—particularly X and TikTok—asserting that sunscreen increases the risk of skin cancer. The posts typically reference a study published in November 2023 that examined gene-environment interactions and skin cancer risk in relation to sun exposure. What these viral posts leave out is crucial: the researchers themselves have explained what their data actually shows, and it is not what the social media versions suggest.
The 2023 study, which analyzed a UK Biobank cohort of people with and without skin cancer, did find an association between frequent sunscreen use and higher rates of skin cancer. That finding is real. But the reason for it has nothing to do with sunscreen being harmful. Instead, researchers discovered that people who used sunscreen tended to spend more time outdoors in the sun. Many of them failed to reapply sunscreen regularly throughout the day. Some had developed a false sense of protection and neglected other sun-safety measures. Additionally, some people increased their sunscreen use only after they had already been diagnosed with skin cancer—meaning the diagnosis came first, not the sunscreen.
Dr. Ivan Litvinov, a dermatology researcher at McGill University and a senior author of the study, has called this the "sunscreen paradox." In correspondence with Reuters, he explained that some sunscreen users "spend more time in the sun without employing other protective measures, leading to increased tanning and sunburn, while having a false sense of protection." The study's own conclusion was unambiguous: "Proper use of sunscreen, combined with other sun-protection measures, reduces the risk of skin cancer." The researchers emphasized the importance of adequate and frequent sunscreen application, along with minimization of UV exposure, particularly for people with fair skin.
Yet the misinterpreted version has found an audience. A separate study published last month in PLOS Digital Health analyzed 971 TikTok videos about sunscreen. The researchers found that most videos actually promoted sunscreen use. Only a small fraction offered critiques, and even fewer claimed sunscreen causes harm or prevents health benefits. But here is where the pattern becomes troubling: the videos that were critical of sunscreen or presented contrarian views received significantly higher engagement—more likes, shares, and comments—than those promoting its use.
This disparity reveals something about how misinformation spreads on social platforms. The researchers noted that "critical or contrarian content may attract disproportionate attention even when not widely represented." The overall dominant narrative on TikTok still favors sunscreen use, and widespread misinformation about it is not the norm among the platform's most visible content. What is happening instead is more subtle: a small number of videos making false or misleading claims are resonating intensely with particular audiences, generating outsized engagement relative to their prevalence. The concern, in other words, is not that false information has taken over the conversation—it is that false information, when it does appear, spreads with unusual force among those who encounter it.
Notable Quotes
Proper use of sunscreen, combined with other sun-protection measures, reduces the risk of skin cancer.— Researchers from the 2023 study
Some sunscreen users spend more time in the sun without employing other protective measures, leading to increased tanning and sunburn, while having a false sense of protection.— Dr. Ivan Litvinov, McGill University
The Hearth Conversation Another angle on the story
So the study itself didn't say sunscreen causes cancer?
No. The study found a correlation between sunscreen use and cancer diagnosis, but the researchers explained why: people using sunscreen spent more time in the sun, often without reapplying it or using other protections.
That's the opposite of what the social media posts claim.
Exactly. The posts extracted one finding and dropped the context that explains it. It's like saying "people who carry umbrellas get wet more often," without mentioning they're the ones going out in the rain.
Why would people increase sunscreen use after a cancer diagnosis?
Because they were diagnosed first. The cancer came before the increased sunscreen use, not after. But if you only see the correlation, it looks backwards.
And the researcher called it a paradox?
Yes. He called it the "sunscreen paradox"—people get a false sense of protection, so they stay in the sun longer without other safeguards. They think the sunscreen alone is enough.
What about the TikTok study? That seems to show misinformation is winning.
It shows something more specific: videos criticizing sunscreen get more engagement than videos promoting it, even though most sunscreen content on TikTok is actually accurate. The false claims are rare but loud.
So the problem isn't that misinformation dominates—it's that it resonates intensely with certain people?
Right. It's not about volume. It's about which videos people interact with most. A small amount of contrarian content is getting disproportionate attention.