What condition is characterized by a rapid heartbeat exceeding 100 beats per minute?

Tachycardia is defined as an elevated heart rate that exceeds 100 beats per minute in adults. This condition can occur under various circumstances, including physical exertion, stress, fever, or as a response to certain medications or medical conditions affecting the heart. Tachycardia can result from a variety of mechanisms and may indicate underlying health issues, such as heart disease or hyperthyroidism.

Understanding this condition is important, as it can have significant implications for a person's health. For example, while some cases of tachycardia are benign and may not require treatment, others can be a sign of more serious problems that warrant medical evaluation and intervention.