Infectious diseases have long been considered one of the triggers for autoimmune and autoinflammatory diseases. Since the appearance of the new coronavirus in December 2019 in the city of Wuhan, China, there have been many reports suggesting that infection with coronavirus 2 (SARS-CoV-2) precedes the appearance of several autoimmune and autoinflammatory diseases. We describe a case report of a patient who was infected with the SARS-CoV-2 virus and later developed a picture of Hashimoto's thyroiditis.