The heart should be beating at 60-100 beats per minute, below 60 beats per minute is bradycardia and above 100 beats per minute is tachycardia. Common cases of bradycardia include athletes or workers who are engaged in long-term physical labor, some elderly people who usually do not have much activity or patients with hypertension, who may also experience bradycardia after long-term use of beta-blockers, including betalactam and conotoxin, and generally have no special symptoms and do not need to be treated. If the heart is below 60 beats per minute and symptoms of chest tightness, panic and shortness of breath occur, the esophageal pacing needs to be checked to see if there are abnormalities in conduction, and bradycardia can also occur in some patients with hypothyroidism. Tachycardia is a condition in which the heart beats more than 100 times per minute, often after strenuous activity, stress, anxiety, or mood swings. If pathological tachycardia occurs, a 24-hour ambulatory ECG monitoring is needed to clarify the diagnosis.