Bradicardia is a medical condition characterized by a slower than normal heart rate, typically defined as fewer than 60 beats per minute in adults. This can occur naturally in some individuals, especially athletes, but it may also indicate an underlying health issue. Symptoms can include fatigue, dizziness, and fainting. In some cases, bradicardia can be caused by problems with the heart's electrical system, certain medications, or other medical conditions. Treatment may involve addressing the underlying cause or, in more severe cases, the use of a pacemaker to help regulate the heart's rhythm.