Do Tattoos Cause Cancer? What the Research Shows

Do tattoos cause cancer? The question went viral in 2024 after a Swedish study reported that people with tattoos appeared to develop lymphoma more often than people without them. And it’s still making the rounds.

So, I did a deep dive on it and then I read up on what’s been published since, and the short version is the science is a lot less settled than it was made out to be.

What each study found

Each bar shows the range of answers a study could not rule out. If the bar touches the blue mark, the study could not tell whether tattoos made any difference.

Less lymphomaNo differenceMore lymphoma

Swedish study, 2024

Could not tell

This is the number the headlines used. It leans toward more lymphoma, but not far enough to be sure there is any difference at all.

Swedish study, people tattooed within two years

Found a difference

The one clear result in the study. Two years is very short for a cancer that takes decades to develop, so it is hard to read as tattoos causing it.

All seven studies together, 2026

Could not tell

The biggest look at the question so far, covering 140,841 people. It landed almost exactly on no difference.

The same seven, with one taken out

Found a difference

Remove one study and a difference appears. The researchers say this does not overturn their main result. It shows how much the answer depends on which studies get counted.

Nielsen et al., eClinicalMedicine 2024. Tudella et al., Clinical and Translational Oncology 2026.

The study that started it

In May 2024, researchers at Lund University published a population-based case-control study in eClinicalMedicine. They compared people diagnosed with malignant lymphoma against matched controls and asked whether tattoo exposure differed between the groups.

Their reasoning was grounded in known chemistry. Tattoo ink contains compounds the International Agency for Research on Cancer classifies as carcinogenic, including primary aromatic amines, polycyclic aromatic hydrocarbons, and metals such as arsenic, chromium, cobalt, lead, and nickel. Ink also doesn’t stay where it’s put. The immune system carries particles away from the injection site and deposits them in the lymph nodes, which is where lymphoma begins.

The authors reported an association and were careful about what it meant, writing that more epidemiological research was urgently needed to establish causality.

What the numbers actually said

The number everyone quoted was 1.21. In plain terms, tattooed people in the study developed lymphoma about 21 percent more often than the people they were compared against.

Every study like this comes with a range attached, because a few thousand people are never the whole population. The Swedish study’s range ran from 0.99 to 1.48. That low end, 0.99, means very slightly fewer cases among tattooed people. So the study’s own math left open everything from no difference at all to a substantial increase. When a range does that, the result is inconclusive, and the authors said as much.

Inconclusive is not the same as safe. This study couldn’t answer the question it set out to answer, and that’s all it tells us.

One result did come out clearly, and most of the coverage skipped it. Among people who got their first tattoo less than two years before the study period, the figure was 1.81, with a range from 1.03 to 3.20. That range stays above 1.0 the whole way, so this one is a genuine finding.

It also points away from ink as the cause. Lymphoma usually takes years to develop, often decades. Two years is not long enough for a tattoo to cause a cancer that then gets diagnosed. Researchers looking at this have raised the likelier explanations, including people getting tattooed around the same period of life when symptoms send them to a doctor. For people tattooed eleven or more years earlier, the figure was 1.19, with a range from 0.94 to 1.50, which is back to inconclusive.

Nicolas Kluger, a dermatologist who studies tattoo medicine, published a formal response saying the study doesn’t support the link it was reported to have found. The paper itself was more careful than the coverage of it.

What happened when the studies were pooled

By 2025 there were several case-control studies to compare. A systematic review and exploratory meta-analysis in eClinicalMedicine brought together the Swedish data with work from Utah and from British Columbia. The Canadian study dates to 2020, so this was a pooling of what existed, not a set of attempts to reproduce the Swedish result.

The pooled analysis found no significant association between tattooing and lymphoma. Its authors were cautious about that too, noting limits in data quality and calling for further high-quality research.

One study that disagrees sat outside the pooled math. A Danish study of twins published in 2025 reported increased hazard of lymphoma and skin cancers among tattooed individuals. The researchers followed a large group of twins and compared tattooed people directly against their own untattooed twin. The review excluded it because that design didn’t fit the comparison.

Where the evidence stands now

The largest synthesis so far arrived in June 2026, in Clinical and Translational Oncology, covering seven observational studies and 140,841 participants.

Its primary results found nothing. Overall lymphoma came out at an odds ratio of 1.02, with an interval from 0.78 to 1.32. Skin cancer came out at 0.92, from 0.83 to 1.04. Every lymphoma subtype the authors examined was non-significant.

Then the same paper does something worth sitting with. In a leave-one-out sensitivity analysis, dropping the Utah study produced a statistically significant association for blood cancers overall, at 1.20 with an interval from 1.05 to 1.39. The authors treat that as exploratory and say it does not displace the primary null result, which reads as the right call. It also shows how fragile these numbers are, since one study in or out changes the answer.

That paper also rates four of its seven included studies at high risk of bias, with none at low risk, and grades the certainty of the evidence as low to moderate. Confounding is the recurring culprit.

Where that leaves removal

This matters for anyone considering removal because of the cancer question specifically, and the two are worth keeping apart.

Three professional bodies addressed removal directly in a joint statement published in 2023: the European Academy of Dermatology and Venereology tattoo and body art task force, the European Society for Lasers and Energy-Based Devices, and the Société Française des Lasers en Dermatologie. Their conclusion was that there’s no definite proof that tattoo removal procedures cause cancer. A 2025 review in Archives of Toxicology reached the same position. We cover that question at greater length in our article on removal and cancer risk.

There’s a genuine open question underneath it, and researchers have raised it. Laser treatment works by breaking pigment apart, and breaking apart certain pigment molecules produces compounds that weren’t there before, including some flagged as carcinogenic or possibly carcinogenic. Nobody has observed that outcome in patients. It’s a mechanism worth studying.

The evidence is also uneven. Most of the toxicology work has looked at ruby and Nd:YAG lasers. Carbon dioxide lasers, which some providers use for cosmetic tattoos, remain largely unstudied.

Readers who arrive here while weighing removal itself may find our guide to making that decision more useful than this one.

Why this is difficult to study

Tattooing doesn’t happen at random across a population, and that is the obstacle.

People with tattoos are more likely to smoke and to drink, and tend to have lower income and less formal education than people without them. Those factors carry their own cancer risks and affect how readily someone reaches medical care. Any study comparing the two groups is partly measuring those differences unless it adjusts for them carefully, and the 2026 review found that adjustment was frequently insufficient across the literature.

Timing is the other problem. Lymphoma develops over decades, while widespread tattooing among younger adults is comparatively recent. If tattoo ink did contribute, a study run today might be looking too early to see it. Ink moves through the body slowly enough that clearance takes months even under laser treatment, and the timescale for anything else is longer still.

What comes next

Larger prospective studies are now running, following people forward in time from the point of exposure. That design handles the confounding problem better than case-control work can, and it should give a clearer answer than anything currently available.

Until then, the accurate summary is that no study has established that tattoos cause cancer. The 2024 finding that generated the alarm didn’t reach significance, and the largest pooled analysis to date found nothing in its primary results. Its authors are candid that the underlying studies are weak and that a single analytic choice was enough to make a signal appear.

If that changes, I’ll update this article.

A note on this guide

Tattoo Takeoff is an independent, research-based resource. It is not a clinic and does not perform removal, and nothing here is medical advice. If you are worried about your own cancer risk, a doctor who can examine you is the right person to ask.