The normal human heart rate is 60-100 times per minute, so a heart rate of more than 90 times per minute is normal, but it is one of the normal conditions that is fast. There are many factors that can cause this, as follows: 1) When the sympathetic nerve is excited, such as when a person is nervous, anxious or overly excited, irritable, there will be a rapid heart rate. 2) If you drink strong tea or strong coffee, there will be a rapid heart rate. 3) If you take drugs that cause excitement, there will be a rapid heart rate, and after exercise, there will also be a rapid heart rate. 4) Women with endocrine system disorders may also have a certain amount of rapid heart rate. Therefore, a heart rate of 90 beats per minute or more, as long as it does not exceed 100 beats per minute, is not considered pathological.