From 4-10 June 2018, the World Heart Rhythm Week takes place all over the world. Naturally, we felt like arrhythmia is a crucial topic to cover. There are of course countless different types of arrhythmias with specific (or even with no) clinical signs; however, we decided to focus on the general symptoms. Remember, if any of these are present, arrhythmias should be one of the differential diagnostical choices.