Endocrine diseases associated with COVID-19 vaccination: case report.

SARS-CoV-2 vaccination is not free of adverse effects. We present two cases of endocrine involvement associated with COVID-19 vaccination. A 46-year-old woman who, after receiving the first COVID-19 vaccination dose, presented persistent fever and signs of thyrotoxicosis after being diagnosed with subacute thyroiditis associated with COVID-19 vaccination; the condition remitted with the use of corticoids. A 71-year-old male, who after COVID-19 vaccination, presented hyperinsulinemic hypoglycemia, testing positive for anti-insulin antibodies; he was diagnosed with autoimmune hypoglycemia associated with COVID-19 vaccination and received treatment with prednisone, controlling the episodes of hypoglycemia. In conclusion, endocrine diseases associated with COVID-19 vaccination are extremely rare and their timely detection allows adequate treatment.