BackgroundThere has been a growing concern about a possible causal relationship between silicone breast implants (SBIs) and health symptoms, often referred to as Breast Implant Illness. This study assessed the association between SBIs for cosmetic augmentation and health symptoms. MethodsRetrospective cohort study using data linkage with the Dutch Breast Implant Registry and Nivel Primary Care Database. A total of 688 women with cosmetic SBIs were age-matched with 1301 women without SBIs. The occurrence of thirteen health symptoms presented in general practice was assessed one year before implantation until three years after implantation. Comparisons were made regarding the number of symptoms and general practice consultations, both before and after implantation, and between the two groups. ResultsWomen with SBIs were more likely to experience three or more distinct health symptoms and a combination of multiple symptoms with multiple consultations during follow-up than women without SBIs (adjusted OR 1.44, 95% CI 1.06 to 1.96; adjusted OR 1.44, 95% CI 1.04 to 2.00, respectively). Women with SBIs also had a more than twice greater likelihood of these outcomes in the second year after implantation compared to one year before implantation (OR 2.13, 95% CI 1.27 to 3.57; OR 2.13, 95% CI 1.22 to 3.72, respectively). ConclusionsWomen with cosmetic SBIs had increased odds of health symptoms after implantation compared to before and to women without SBIs. These results suggest an association between health symptoms and cosmetic SBIs that needs further research to explore whether there is causality or residual confounding.