The heartbeat is known medically as the heart rate and refers to the number of times the heart beats per minute. In adults in a quiet state, the heart rate is usually between 60 and 100 beats per minute. In normal adults in the resting state, the heart rate is between 60-100 beats per minute. Generally heart rate within the normal range, normal people have no obvious feeling, but if the heart rate is abnormal in combination with other diseases, then there can be uncomfortable symptoms. If the heart rate is more than 100/minute tachycardia, patients mostly have panic, shortness of breath, chest tightness and fatigue and other discomforts, which may be caused by organic heart disease, hyperthyroidism, anemia and other diseases. A heart rate of less than 60 beats per minute is called bradycardia, which can be seen in athletes, the elderly and when sleeping, as well as some diseases, such as arrhythmia, myocardial infarction, hypothyroidism and so on, can also lead to bradycardia, which can be accompanied by paroxysmal dizziness, blackout episodes, and even sudden death. Patients with abnormal heart rate should undergo further relevant examinations, such as electrocardiogram and cardiac ultrasound, in order to identify the cause of the disease and intervene at an early stage, so as to avoid delaying the condition.