An electrocardiogram or ECG is a painless, noninvasive way to help diagnose many common heart problems in people of all ages. 

You may need an ECG if you have any of the following signs and symptoms based on your doctor’s decision:

Chest pain, Dizziness, lightheadedness or confusion, Heart palpitations, Rapid pulse, Shortness of breath, Weakness, fatigue or a decline in ability to exercise