Chest pain is one of the common reasons for admission to the emergency department and an important symptom that can be a precursor of a fatal condition. A simple muscle pain can be a sign of illnesses until myocardial infarction or even aortic dissection, which is more lethal. In this respect, electrocardiogram ( ECG) which is of critical importance in the evaluation of patients is a guide for us. However, starting treatments such as thrombolytic therapy that is solely considered according to ECG may be a wrong decision. Therefore, detailed investigations should be made for establishing a diagnosis and treatment plans should be made accordingly. In this paper, we present a 19-year-old male patient who was admitted to our emergency department with chest pain, having ST segment elevation of D2, D3 and aVF in ECG along with troponin elevation and was diagnosed with acute pericarditis.