Thyrotoxicosis is a common endocrine disorder that can present with a variety of systemic symptoms and affect cardiac circulation. Thyrotoxicosis patients are susceptible to acute myocardial infarction (AMI), and especially if they have Grave's disease. Painless thyroiditis, also termed "silent thyroid-itis," manifests as transient thyrotoxicosis, displays symptoms similar to those of Grave's disease, but rarely causes AMI. Here, we report the case of a 26-year-old Chinese man with a normal coronary angiogram who experienced AMI secondary to painless thyroiditis. During the past 5 years, several reports have described AMI induced by Grave's disease or a thyroidectomy; however, few reports have described AMI related to thyroiditis, and only 2 cases were similar to the case described here.
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