The normal heart rate for a person in a quiet state is 60-100 beats per minute. The normal range of heart rate for a person at rest is 60-100 beats per minute. Individual variations can occur due to age, gender, or other physiological factors. The younger the person, the faster the heart rate, older people have a slower heart rate than younger people, and women have a faster heart rate than men of the same age, all of which are normal physiological phenomena. If the patient’s heart rate is less than 60 beats per minute, this is called bradycardia and may be associated with electrolyte disorders, renal insufficiency, and sick sinus node syndrome. Heart rates of less than 60 beats per minute can also be seen in the elderly and in athletes. If the patient’s heart rate is greater than 100 beats per minute, it is called tachycardia, which may occur in the presence of anemia, hyperthyroidism, agitation, stress, and exertion. It is important to note that the heart rate varies with sleep, emotional changes, and the amount of exercise, and the heart rate is not constant. When in deep sleep, the heart rate may drop below 60 beats per minute, and when exercising strenuously, the heart rate can reach about 140 beats per minute. If you suffer from repeated palpitations and chest tightness, it is recommended that you seek medical attention as soon as possible to avoid delaying your condition.