"nighttime heart palpitations"

Is Your Heart Beating Erratically? Arrhythmia, from Symptoms to Prevention: A to Z

Have you ever felt your heart suddenly drop with a thud for no clear reason, or pound erratically and then pause? With a tight chest and a feeling of breathlessness, you may have wondered whether something serious was wrong with your heart. Let us take a quiet look at irregular heartbeats, known as arrhythmia.