We define a heart rate over 100 beats per minute as tachycardia, which can be sinus tachycardia, atrial tachycardia, junctional tachycardia, among others. Moreover, tachycardia can be physiological or pathological. For instance, a person experiencing tachycardia during intense physical activity or emotional excitement without any organic disease, and if this tachycardia is sinus tachycardia, then it is considered related to the intense activity or emotional state. On the other hand, conditions like anemia, hyperthyroidism, or heart failure can also lead to tachycardia. Whether tachycardia is physiological or pathological, and whether it is sinus or caused by other pacemakers in the heart, should be determined by a specialist.