It is normal for the heart to beat more than 80 times a minute. The normal adult sinus rhythm is between 60 and 100 times a minute, and more than 80 times a minute is within the normal range. If the heart beats less than 60 times per minute, it is considered bradycardia, and more than 140 times per minute, it is considered tachycardia. There is a distinction between physiological and pathological bradycardia. Physiological bradycardia is common among athletes and workers with high physical activity. Pathological bradycardia is common in diseases such as hypothyroidism, cardiac conduction abnormalities, and some drugs that cause bradycardia, such as some anti-arrhythmic drugs and beta-blockers among antihypertensive drugs, which can cause bradycardia. Pathological tachycardia can only be diagnosed clinically with 24h ambulatory ECG monitoring. Physiological tachycardia is usually seen after stress, anxiety, mood swings, and after taking stimulant drinks, alcohol, tea, or coffee, and the physiological arrhythmia can be relieved by removing the triggering factors.