An ECG records the electrical activity of your heart and is a valuable tool for assessing heart rhythm, rate, and overall function. This simple, painless test is useful for investigating symptoms such as chest pain, palpitations, dizziness, or shortness of breath. It can also help diagnose conditions like arrhythmias, heart disease, or the effects of high blood pressure. Results are explained clearly by your GP, with referrals if further cardiac evaluation is needed.