A heart rate above 90 beats/minute for a long time, but not exceeding 100 beats/minute, is generally harmless, if it is above 100 beats/minute, it will lead to insufficient blood supply, etc.
The normal range of heart rate is 60 to 100 beats/min. If the heart rate is above 90 beats/min and below 100 beats/min, it is usually harmless, but you may experience palpitations and need to determine whether you have a primary disease.
If the heart rate is above 100 beats/min, it will shorten the diastolic period of the heart and reduce the blood returning to the heart, which will lead to insufficient blood supply and ischemic symptoms such as palpitations, dizziness and weakness, so it is necessary to control the heart rate.
Note: If the heart rate is too fast for a long time, it is recommended to go to the hospital in time.