An arrhythmia is an abnormal rate and/or rhythm of the heartbeat. There are various types but all are due to some problem with the electrical conducting system of the heart. Some arrhythmias are more serious than others. Some come and go (are intermittent); others are permanent unless treated.
This is a companion discussion topic for the original article at https://patient.info/heart-health/palpitations-leaflet/abnormal-heart-rhythms-arrhythmias