means to express identity or celebrate milestones in life. Yet we know very little about the long-term health effects. Hazardous chemicals in tattoo ink have received attentionduring the last ten years. In parallel, research has shown that the ink that is injected into the skin does not stay there.
To connect the dots, my colleagues and I at Lund University, Sweden, conducted a large study to answer whether having tattoos might increase the risk of malignant lymphoma, a rare form ofis tattooed, Sweden is one of the most tattooed countries in the world. The country also has a long tradition of keeping population registers, for instance, the National Cancer Register includes everyone with a cancer diagnosis.
The participants answered a questionnaire about several lifestyle factors, and those who were tattooed were asked about tattoo size, their age at first tattoo, and tattoo colours. The study included 5,591 people . It is important to keep in mind that lymphoma is a very rare disease and that the risk increase relates to a very low baseline risk. According to the National Board of Health and Welfare, 22 in 100,000 people in the age group 20 to 60 years were diagnosed with lymphoma in Sweden in 2022.The size of the tattoos did not seem to matter. What did matter was time – how long participants had had their tattoos. The risk seemed to be higher for new tattoos and for older tattoos .
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