When diagnosing myocarditis, the doctor first takes a comprehensive medical history by thoroughly evaluating the patient's symptoms and medical background. During this process, a physical examination is performed, and the heart is listened to with a stethoscope. Additionally, various laboratory and imaging tests are requested to support the diagnosis. These tests typically include blood tests, transthoracic echocardiogram, electrocardiogram (ECG), chest X-ray, and Holter monitoring.