A normal human heartbeat (heart rate) in a quiet state is 60-100 beats per minute, a heart rate >100 beats per minute is called a rapid heart rate and a heart rate <60 beats per minute is called a slow heart rate. The change of heart rate should be related to the following aspects: 1. The number of heartbeats of normal people is related to exercise, mood swings and work and life status; 2. The heart rate of pregnant women is slightly faster than that of ordinary women; 4. The occurrence of heart disease or arrhythmia can cause the heart rate to increase or decrease, and patients should go to the hospital for electrocardiogram, cardiac ultrasound and other related examinations in time to make a clear diagnosis and give timely treatment to prevent life-threatening conditions.