Chest pain is usually a benign presentation in children who present to emergency departments (ED) or primary care centers. Unlike adults, where chest pain is commonly due to cardiac causes, in children the cause is more likely secondary to non-cardiac causes. Here we present a case of a child known to have hyper-eosinophilic syndrome (HES) who presented with sudden onset of chest pain and had a rapidly progressive and fatal outcome in the ED. We discuss the ED approach to the child with chest pain and review acute myocardial infarction (AMI) in children.