Brachycardia is a medical condition characterized by an abnormally slow heart rate, typically defined as fewer than 60 beats per minute in adults. It can result from various factors, including Heart disease, electrolyte imbalances, or the effects of certain medications. While it may be benign in some individuals, especially athletes, it can also lead to symptoms like fatigue, dizziness, or fainting if the heart is unable to pump sufficient blood to meet the body's needs. Treatment depends on the underlying cause and severity of the condition.