Bradycardia is a medical condition characterized by an abnormally slow heart rate, typically defined as fewer than 60 beats per minute in adults. It can occur due to various factors, including Heart disease, certain medications, or as a result of increased vagal tone in athletes. While it may be asymptomatic in some individuals, bradycardia can lead to symptoms like fatigue, dizziness, or fainting in others. Treatment depends on the underlying cause and severity of the condition.