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CORR Insights®: Influenza Vaccination Is Not Associated with Increased Number of Visits for Shoulder Pain.

When a vaccination is introduced into the shoulder, practitioners aim to administer the antigenic material into the deltoid muscle. Some localized pain is normal, and the shoulder may even hurt for a day or two. However, there is a subset of patients who have shoulder pain that lasts more than 7 days, sometimes accompanied by stiffness and rotator cuff dysfunction. There is even a name for this atypical post-vaccination shoulder pain: shoulder injury resulting from vaccination administration (SIRVA) [1]. However, SIRVA has only been reported in case reports and case series [1, 2], or studies of claims made against vaccination injury compensation funds [4]. No one has asked the question of whether shoulder pain that arises after vaccination is truly caused by the vaccination, or simply arises temporally afterwards. In this article, however, Gonzalez et al. [3] show that the number of visits from shoulder pain was unchanged before and after flu immunization. This suggests that shoulder pain after vaccination might actually be causally unrelated to the immunization. Viruses and vaccinations are at the forefront of public health. From coronavirus disease 2019 to the reintroduction of measles, viruses and controversies about the safety and efficacy of vaccinations are important public health issues. We know that controlling viruses and introducing herd immunity is important. What we need are studies showing safety and efficacy. This eloquent article by Gonzalez et al. [3] provides insight into the cost side of the equation. This study compares the frequency of shoulder pain visits before and after the administration of influenza vaccinations to the shoulder. The authors showed that in more than 12,000 patients given a flu shot, there was no difference in shoulder-related clinic visits before and after the shots. This is a wonderful starting point, which allays concerns about the costs and side effects of forced vaccine administration.