Heart disease symptoms caused by abnormal heartbeats (heart arrhythmias)

A heart arrhythmia is an abnormal heartbeat. Your heart may beat too quickly, too slowly or irregularly. Heart arrhythmia symptoms can include: Fluttering in your chest Racing heartbeat (tachycardia) Slow heartbeat (bradycardia) Chest pain or discomfort Shortness of breath Lightheadedness Dizziness Fainting (syncope) or near fainting