An Electrocardiogram (ECG) is the foundational, non-invasive test for your heart's health. It provides a vital, real-time snapshot of your heart's electrical activity. This test is essential for investigating symptoms like chest pain, palpitations, dizziness, or shortness of breath. The procedure is simple, fast, and completely painless—small, sticky electrodes are placed on your chest, arms, and legs to record your heart's rhythm for a few seconds. It is the gold-standard, immediate tool for detecting arrhythmias (irregular heartbeats), signs of a current or previous heart attack, and heart muscle strain. This is a routine yet critical check, providing your doctor with the essential, first-line data needed to protect your cardiovascular health.