A real UK Biobank study is being shared online with a misleading conclusion: that sunscreen causes skin cancer. That is not what the study proves.
The useful question is not “should everyone panic-stop using SPF?” It is “what did the study actually measure, and what does that mean for everyday sun protection?”
Quick answer
No, this study does not show that sunscreen causes skin cancer. It found an association between people reporting more sunscreen use and higher recorded skin cancer risk, but an association is not the same as proof of cause and effect.
People who use sunscreen more often may also spend more time in the sun, burn more easily, have lighter skin, have a personal or family history that makes them more cautious, or start using sunscreen more after a diagnosis or health warning. Those factors can affect both sunscreen use and skin cancer risk.
The practical takeaway is not to stop using sunscreen. It is to use sunscreen properly and treat it as one part of sun protection, alongside shade, clothing, sunglasses, hats and sensible timing.
What people are claiming
Some viral posts say that because frequent sunscreen users in a study had higher recorded skin cancer risk, sunscreen itself must be causing cancer.
That claim sounds simple, which is part of why it spreads. But it skips the most important part of interpreting observational research: people do not use sunscreen randomly. Sunscreen use is tied to behavior, skin type, sun exposure, past health history and perceived risk.
What the study actually found
The original paper by Jeremian and colleagues used UK Biobank data to examine genetic and environmental factors in a skin cancer cohort. Sunscreen use appeared among the factors associated with skin cancer risk in the analysis.
That does not mean the study showed sunscreen caused the cancers. It was an observational analysis, not a randomized sunscreen trial where similar groups were assigned to use or not use sunscreen in controlled conditions.
Reuters and Full Fact both addressed the viral interpretation of this study. Their core point is the same: the study is real, but the viral conclusion is too strong. It observed an association; it did not establish sunscreen as the cause.
Why association is not causation
A simple example helps.
People who spend more time outdoors in strong sun are more likely to use sunscreen. They are also more likely to receive more UV exposure. If that group has more skin cancer, sunscreen may be a marker of sun exposure rather than the cause of the cancer.
This is sometimes called confounding. One factor appears linked to an outcome because it travels with another important factor. In this case, sunscreen use can travel with things like outdoor time, sun-sensitive skin, past sunburns, fairer skin, travel to sunny places or a previous skin cancer diagnosis.
That does not make sunscreen perfect. It means this study cannot be used as proof that sunscreen itself causes skin cancer.
The sunscreen paradox
The “sunscreen paradox” is the idea that sunscreen users can sometimes show higher sun-related risk in observational data because of how sunscreen is used in real life.
For example, someone may:
- use sunscreen because they plan to spend longer in high UV;
- apply too little and assume they have full labeled protection;
- forget to reapply after sweating, swimming or hours outdoors;
- skip shade, hats, sunglasses and clothing because SPF feels reassuring;
- use sunscreen mainly after already being told they are higher risk; or
- treat SPF as permission to stay in strong sun for hours.
In that situation, sunscreen is not necessarily the problem. The bigger issue may be high UV exposure plus overconfidence in a thin or poorly reapplied layer.
SPF is not a permission slip to stay in intense sun indefinitely.
What this means for real sun protection
For everyday decisions, keep the advice practical:
- Check the UV index when you are planning meaningful time outside.
- Use enough sunscreen to cover exposed skin evenly.
- Reapply according to the label, especially after swimming, heavy sweating, towel-drying or long outdoor time.
- Use shade, hats, sunglasses and protective clothing when practical.
- Avoid treating sunscreen as the only protective step.
- Consider SPF 30+ or SPF 50+ depending on UV level, exposure time, activity and how easy it will be to reapply.
The Sun Protection Advisor can help you think through forecast UV, timing and activity without turning one study headline into panic.
This is general sun-safety information, not personal medical advice. If you have a history of skin cancer, photosensitivity, unusual moles, medication-related sun sensitivity or a specific medical concern, ask a doctor or pharmacist.
What about sunscreen in makeup or tinted moisturizers?
SPF in makeup or tinted moisturizers can be useful, but many people apply those products for cosmetic finish rather than as a thick, even sunscreen layer.
That is why The Useful Kind treats SPF makeup as an added benefit unless it is applied in the amount and manner needed for real sunscreen protection. In the Catrice Skin Like Tinted Moisturizer SPF 30 review, for example, one pump worked well cosmetically, but I would not assume it delivers the full labeled SPF across the whole face.
If sunscreen pills under makeup, the answer is not to use a tiny amount and hope for the best. Start with practical layering fixes, such as gentler application, simpler skincare underneath and enough settling time. The sunscreen pilling guide walks through that without encouraging under-application.
Practical takeaway
- Do not panic-stop using sunscreen because of one viral post.
- Do not read an association as proof of causation.
- Do not rely on sunscreen alone.
- Do not use a tiny amount and assume full protection.
- Do use sunscreen as part of a broader sun-protection plan.
- Do use shade, clothing, hats and sunglasses when they make sense.
The study is worth reading carefully. The viral claim is not.
Related tools and guides
- Sun Protection Advisor: plan practical sun protection around today’s forecast UV, timing and activity.
- Catrice Skin Like Tinted Moisturizer SPF 30 Review: an example of treating SPF makeup as an added benefit, not a full sunscreen plan.
- Why Does Sunscreen Pill Under Makeup?: troubleshoot layering without using less sun protection.