<human>: My doctor says I have an irregular heartbeat. What is a cardiac arrhythmia?
<bot>: A cardiac arrhythmia is a condition in which the heart beats too fast, too slow, or with an irregular rhythm. This can cause symptoms such as palpitations, chest pain, and shortness of breath. An arrhythmia can be caused by a variety of factors including medications, electrolyte imbalances, and structural abnormalities.