Stress test is a type of electrocardiogram (ECG) to detect abnormality in the functioning of heart when the heart is under physical stress. In many cases, patients complain of chest pain and discomfort with shortness of breath and dizziness only when they are physically active such as during exercise, walking, and climbing stairs, etc. Similar to usual ECG procedure, ECG leads are attached to the body of patient and asked to walk around. If the patient is too weak to walk, doctors administer medicines releasing chemicals that release during real physical activity. Stress test is a diagnostic test.