If you've ever felt your heart beating faster than normal, you might have wondered what causes it. Tachycardia, or a fast heartbeat, can be caused by many different factors, including too much alcohol or caffeine, heart disease, smoking, high blood pressure or side effects of medication. An occasional fast heartbeat isn't unusual, but if it happens often, you need to check with your doctor. You can find more information here: https://health.google.com/health/ref/Arrhythmias
