Research from Sweden’s Lund University found that the risk of developing malignant lymphoma was 21 per cent higher among people with tattoos.
The study investigated the link between tattoos and cancer in the lymphatic system by examining data from national registries in Sweden.
“We have identified people diagnosed with lymphoma via population registers,” says Christel Nielsen, the researcher at Lund University who led the study.
“These individuals were then matched with a control group of the same sex and age, but without lymphoma. The study participants answered a questionnaire about lifestyle factors to determine whether they were tattooed or not.
“After taking into account other relevant factors, such as smoking and age, we found that the risk of developing lymphoma was 21 per cent higher among those who were tattooed.
“It is important to remember that lymphoma is a rare disease and that our results apply at the group level. The results now need to be verified and investigated further in other studies and such research is ongoing.”
The study included 11,905 people in total. Of these, 2,938 people had lymphoma when they were between 20 and 60 years old. Among them, 1,398 people answered the questionnaire, while the number of participants in the control group was 4,193.
In the group with lymphoma, 21 per cent were tattooed (289 individuals), while 18 per cent were tattooed in the control group without a lymphoma diagnosis (735 individuals).
A hypothesis that Nielsen’s research group had before the study was that the size of the tattoo would affect the lymphoma risk. They thought that a full body tattoo might be associated with a greater risk of cancer compared to a small butterfly on the shoulder, for example. Unexpectedly, the area of tattooed body surface turned out not to matter.
“We do not yet know why this was the case. One can only speculate that a tattoo, regardless of size, triggers a low-grade inflammation in the body, which in turn can trigger cancer. The picture is thus more complex than we initially thought,” Nielsen says.
Most people get their first tattoo at a young age, which means that you are exposed to tattoo ink for a large part of your life. Even so, research has only scratched the surface of the long-term health effects of tattoos.
“We already know that when the tattoo ink is injected into the skin, the body interprets this as something foreign that should not be there and the immune system is activated. A large part of the ink is transported away from the skin, to the lymph nodes where it is deposited,” says Nielsen.
The research group will now proceed with studies of whether there is any association between tattoos and other types of cancer. They also want to do further research on other inflammatory diseases to see if there is a link to tattoos.
“People will likely want to continue to express their identity through tattoos, and therefore it is very important that we as a society can make sure that it is safe,” says Nielsen.
“For the individual, it is good to know that tattoos can affect your health, and that you should turn to your health care provider if you experience symptoms that you believe could be related to your tattoo.”