Sunscreen use has climbed steadily across many countries, yet skin cancer diagnoses continue to rise. Skeptics point to this apparent paradox as proof that sunscreen is ineffective — a conclusion that research shows can be seriously harmful. Understanding what is actually driving the increase reveals three widespread myths that significantly increase UV exposure even among people who do apply sunscreen.
Table of Contents
- What's driving rising skin cancer rates?
- Myth 1: Tanning Beds Can Be Safe
- Myth 2: Getting a Tan Is Safe While Wearing Sunscreen
- Myth 3: Being in the Sun Is Safe with Sunscreen On
- Does Sunscreen Actually Help?
- References
What's Driving Rising Skin Cancer Rates?
Starting with the facts: sunscreen use has genuinely increased in many countries. In the U.S., reported use climbed from 25% to 33% since 2000 [1].
A study of beachgoers in Denmark revealed a similar trend. The frequency of sunscreen use among women increased from 45% in 1997 to 78% in 2016. Among men, use went from 39% to 49%. At the same time, typical SPF levels increased, and people applied more product per session [2].
Skin cancer rates are also rising. The rate of people being diagnosed with melanoma has been climbing in the U.S., the U.K., Australia, and elsewhere [3].
These two trends happening simultaneously is unexpected. Greater sunscreen use should logically lower skin cancer rates — if sunscreen is effective at protecting skin from UV radiation.
Skeptics argue that simultaneous trends mean sunscreen simply does not work. But drawing that conclusion is a significant error, and the evidence points clearly in a different direction. Several compounding factors explain why rising sunscreen use has not reversed rising cancer rates — factors that are entirely separate from whether sunscreen is effective when used correctly.
One crucial factor is demographic: populations are ageing. People are having fewer children and living longer, pushing the proportion of adults over 65 upward [4].
This trend is only going to accelerate in the years ahead. Skin cancers are far more common in older adults. Data from the U.K., for example, shows peak melanoma diagnoses occurring in people in their 70s [5].
Ageing alone does not explain the full increase. Researchers examining global skin cancer rates calculated how incidence is changing even after accounting statistically for an ageing population — essentially asking: if the age distribution had stayed the same, what would the trend look like? The answer: globally, and across all skin cancer types, the age-adjusted incidence rate grew steadily from 1990 to 2021, with an annual change of almost 2% [6].
That is after accounting for an ageing population.
Particularly concerning is rising melanoma incidence among younger people. In the U.S., the melanoma incidence rate for young men in 2009 was four times what it was in 1970. In young women, the 2009 rate was eight times as high [7].
The authors of the global incidence study identify the most important driver as the most obvious one: more skin cancer is caused by more UV exposure [6]. Outdoor recreation has increased, urban populations in northern latitudes travel to sunny destinations more frequently, and UV-seeking behaviour — whether through tanning beds or deliberate sun exposure — has become more normalised in certain cultures.
This brings the analysis back to sunscreen. Greater use should be helping — and it is, for the people who use it correctly. But three dangerous myths are dramatically increasing UV exposure across the population, negating those gains.
Understanding these myths also points toward a critical issue: not just how sunscreen is used, but which sunscreen is chosen. Some chemical sunscreen ingredients are absorbed through the skin and detected in the bloodstream — a topic covered further below.
Myth 1: Tanning Beds Can Be Safe
The first myth is that tanning beds offer a safe way to tan.
This belief is partly explained by context: tanning salons often operate in environments that feel vaguely clinical, and the indoor tanning industry frequently uses marketing language that implies a careful, scientific approach to UV exposure.
Tanning industry marketing often emphasises supposed benefits, such as mood improvement or vitamin D production — and given growing public interest in vitamin D, this can be a persuasive angle.
Many people also use tanning beds to build a "pre-vacation" base tan — the assumption being that prior exposure provides a protective layer before beach holidays [8].
The evidence does not support this. Tanning beds are not safe.
A substantial body of data links tanning beds with elevated skin cancer risk. A recent meta-analysis covering 36 studies and over 14,000 melanoma cases found that melanoma risk is 27% higher for anyone who has ever used a tanning bed [8].
A dose-response relationship is also clear: one meta-analysis calculated a 1.8% increase in melanoma risk for each additional session of indoor tanning per year [8].
Other skin cancer types show a similar pattern. A 2021 meta-analysis concluded that the risk of squamous cell carcinoma was 58% higher for people exposed to tanning beds [8].
The primary reason tanning beds are so hazardous is the intensity of UV radiation produced. Tanning beds can emit UV radiation in amounts 10 to 15 times higher than direct sunlight [9].
Frequent tanning bed users receive an annual dose of UVA radiation up to 4.7 times higher than what the average person receives from natural sunlight [7].
This body of evidence is why the International Agency for Research on Cancer classifies tanning beds as a Group 1 carcinogen — the same category as cigarettes and asbestos [7].
Myth 2: Getting a Tan Is Safe While Wearing Sunscreen
Tanning beds are not the only source of the problem. Paradoxically, greater awareness and use of sunscreen has reinforced a second myth: that sunscreen provides a safe pathway to tanning.
The logic many people apply: sunscreen blocks the harmful rays, leaving only the beneficial ones to produce a tan.
This is incorrect. The only wavelengths of sunlight that stimulate the tanning process are UVA and UVB radiation. Getting a tan is direct evidence of exposure to significant levels of one or both — and that exposure damages DNA, causing mutations that can lead to skin cancer [10].
A tan is not a sign of healthy sun exposure. It is a sign of UV damage. The skin produces melanin in response to DNA injury caused by UV radiation — the pigmentation is a repair and defence mechanism, not a benign cosmetic outcome. This mechanism exists in the body precisely because UV exposure is harmful enough to require a biological counter-response.
Myth 3: Being in the Sun Is Safe with Sunscreen On
The mechanism behind myth 2 leads directly to a third: that any sun exposure is safe as long as sunscreen is applied.
The reason people can still tan while wearing sunscreen is that sunscreen does not block all UV radiation. The familiar SPF (sun protection factor) rating is primarily a measure of UVB blocking [11].
This is because sunscreen research originally focused on preventing sunburn, and UVB is the primary driver of sunburn. Testing continues to centre on protection against skin redness following sun exposure [12].
What the SPF numbers mean in practice: SPF 15 blocks 93.3% of UVB radiation; SPF 50 blocks 98% [11]. Even SPF 100 does not achieve 100% protection.
The more significant gap is with UVA radiation. The historical focus on UVB means UVA protection is often considerably weaker — even in products labelled "broad spectrum." Research shows that the effectiveness of sunscreens drops markedly across the UVA part of the spectrum [12].
Sunscreen provides meaningful protection, but not complete protection. The belief that it does drives a change in behaviour: people wearing sunscreen tend to spend more time in the sun because they feel protected. This "risk compensation" effect is well documented in health behaviour research and is compounded by the fact that most people do not apply sunscreen in sufficient quantities or with sufficient frequency — studies suggest the average person applies roughly one-quarter of the amount used in SPF testing, which substantially reduces real-world protection and results in higher levels of UV exposure than they realise [3].
Additional protective strategies are therefore important. Avoiding direct sunlight during midday hours, when UV radiation is at its highest intensity, provides significant additional protection. Covering up with UV-blocking clothing, wide-brimmed hats, and UV-filtering sunglasses delivers considerably stronger protection than sunscreen alone.
On the question of sunscreen ingredients: certain chemical UV filters — including oxybenzone, octinoxate, and octocrylene — are absorbed through the skin and detected in blood plasma. Research into the long-term implications is ongoing. Mineral sunscreens using zinc oxide or titanium dioxide work by physically deflecting UV radiation rather than absorbing it, and are not absorbed systemically in the same way. For people who prefer to minimise ingredient absorption, mineral options represent a well-evidenced alternative.
Does Sunscreen Actually Help?
Given the complexity of the picture above, does sunscreen still offer meaningful protection?
The evidence says yes. Sunscreens block a substantial proportion of harmful UV radiation when applied correctly, and this translates into real reductions in risk.
One of the most important long-term studies in this area was conducted in Australia. Beginning in 1992, approximately 1,600 people were assigned to either a daily sunscreen group or a group that used sunscreen at their discretion. After four years the study was paused, but participants were followed up ten years later. The risk of developing melanoma in the daily sunscreen group was half that of the discretionary-use group [13].
The overall data on sunscreen and skin cancer prevention is complex. Several recent meta-analyses have found no statistically significant effectiveness of sunscreen for preventing skin cancers [14]. Research in this area is inherently difficult: population studies are the primary available method; people who wear sunscreen often engage in more sun-seeking behaviour; and skin cancers develop slowly over decades, creating long lags between exposure and diagnosis.
Two lines of evidence, however, point clearly to effectiveness. First, it is well established that sunscreen blocks a high percentage of UV radiation, and UV radiation drives skin cancer in a dose-dependent manner. Blocking the driver logically reduces the risk.
Second, photoaging — skin ageing caused by UV damage — manifests more quickly than cancer, making it easier to detect the protective effect of sunscreen. A landmark 2013 randomised trial of 903 adults found that participants assigned to daily sunscreen use showed no detectable new skin ageing over 4.5 years, compared with the control group [15].
A systematic analysis of the literature summarises it this way: "Evidence from observational studies, a large randomized controlled trial, and smaller, nonrandomized experimental studies supports the effectiveness of sunscreens in preventing the signs of photoaging" [14].
Preventing the signs of photoaging means reducing skin exposure to damaging radiation. Reducing that exposure also reduces the biological driver of skin cancer. The two outcomes are linked by the same mechanism.
The practical takeaway: sunscreen works when used correctly and consistently. The problem is not sunscreen — it is behaviour around sunscreen. Believing a tan is safe while wearing sunscreen, spending more time in the sun because of a false sense of complete protection, using tanning beds, and applying sunscreen inadequately all increase UV damage despite — and sometimes because of — greater sunscreen use. Choosing a broad-spectrum sunscreen with genuine UVA coverage, applying an adequate quantity, reapplying after water exposure or sweating, and combining it with shade and protective clothing gives the best available protection against UV-related skin damage.
References
1. https://www.ncbi.nlm.nih.gov/books/NBK587264/
2. https://medicaljournalssweden.se/actadv/article/view/5003
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC10741796/
4. https://www.npr.org/2011/09/24/140736119/as-europe-ages-its-economies-look-vulnerable
6. https://www.nature.com/articles/s41598-025-90485-3
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC11931655/
8. https://pmc.ncbi.nlm.nih.gov/articles/PMC9689757/
9. https://pmc.ncbi.nlm.nih.gov/articles/PMC4929140/
10. https://pmc.ncbi.nlm.nih.gov/articles/PMC2913608/
11. https://pmc.ncbi.nlm.nih.gov/articles/PMC3460660/
12. https://onlinelibrary.wiley.com/doi/10.1111/phpp.12738
13. https://ascopubs.org/doi/full/10.1200/JCO.2010.28.7078
