human
My doctor says I have an irregular heartbeat. What is a cardiac arrhythmia?
assistant
An arrhythmia is a disturbance in the normal electrical activity of the heart. It can be caused by many factors, including genetic predisposition, electrolyte imbalances, medications, and stress. Arrhythmias are usually harmless, but they may cause symptoms such as palpitations, dizziness, or chest pain.