Atrial fibrillation is the most common arrythmia worldwide, increasing in prevalence with age. There are few reports about the relationship between atrial fibrillation and subacute thyroiditis. We describe the case of a 54-year-old man who had unexpected atrial fibrillation. He also had thyrotoxicosis caused by subacute thyroiditis. After admission, conversion to sinus rhythm was soon achieved without specific therapy. The present case suggested subacute thyroiditis may contribute to the

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... nce of atrial fibrillation as a trigger, but the specific mechanism has not been settled.