Atrial flutter (AFL) is a detrimental cardiac arrhythmia caused by multiple pathologic conditions.Certain unsuspecting cases,however, may be an inciting factor.Among them is blunt cardiac injury (BCI), characterized by nonpenetrating mediastinal trauma, leading to arrhythmias due to myocardial tissue injury.AFL is a rare sequela of BCI that has seldom been reported.We present a case of a healthy 50-year-old lady who was incidentally diagnosed with AFL in the setting of BCI.