Two Cases of Thyroiditis in Adolescents Following COVID-19 Vaccinations.

With the onset of the COVID-19 pandemic and the development of widespread vaccination strategies, there have been case reports in the adult literature suggesting an increase in thyroiditis after COVID-19 vaccination. We herein describe 2 children who presented with thyroiditis after COVID-19 vaccination. Two children who received Pfizer-BioNTech COVID-19 messenger RNA vaccines later developed symptoms of thyroid hyperactivity, had positive thyroid-stimulating immunoglobulin (TSI) levels and received treatment directed toward Graves disease. Our case series is the first to demonstrate Graves disease after COVID-19 vaccination in the pediatric population. Given this possibility, it is important for pediatricians to be watchful for symptoms of thyroiditis post vaccination to prevent treatment delays.