The normal range of heartbeat is 60~100 beats/min, where less than 60 beats/min is bradycardia and more than 100 beats/min is tachycardia. 1. A normal heartbeat enables the heart to contract and diastole regularly, which is necessary for life activities. 2. Bradycardia often causes blood to accumulate in the periphery and in the heart, causing dyspnea, fatigue, and gastrointestinal indigestion. This condition requires prompt treatment with digitalis or a pacemaker. 3. Tachycardia will cause the shortening of the heart’s systolic and diastolic time, making the blood stagnation in the periphery, causing dyspnea, cyanosis, and gastrointestinal stagnation, etc., and will also make the heart become hypertrophied and cause heart attack. The disease needs to be treated with drugs that lower the heart rate, such as propranolol. The above drugs need to be taken under the guidance of a specialized doctor. If the above situation occurs, please consult a doctor in time for reasonable and standardized diagnosis and treatment.