Arrhythmia is a medical condition that affects the heart's rhythm, causing it to beat too fast, too slow or irregularly. There are several terms used to describe this condition including dysrhythmia, irregular heartbeat, heart rhythm disorders, cardiac arrhythmias and abnormal heart rhythms. These terms are all synonymous and are used interchangeably to describe the same condition. Arrhythmia can be caused by a variety of factors, including heart disease, medications, genetics and lifestyle factors such as stress or excessive consumption of caffeine and alcohol. If you experience symptoms such as palpitations, shortness of breath or chest pain, it is important to seek medical attention as soon as possible to prevent any potential complications.