Heart beat 120-125 times / minute, dizziness and shortness of breath are dangerous?

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Hello doctor! I am 19 years old this year, the normal heart beat ranges from 100-110 times / minute. Recently, even though I haven't exercised vigorously, my heart rate sometimes rises to 120-125 times / minute, dizziness and shortness of breath. Doctor let me ask, if the heart beats 120-125 times / minute, dizziness and shortness of breath, is it dangerous? I would like to thank the doctor.
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Answered by Master, Doctor Pham Van Hung - Department of Medical Examination & Internal Medicine, Vinmec Danang International General Hospital.
Hello,
With the question “Is the heart beating 120-125 times/minute, dizziness and shortness of breath dangerous? , the doctor would like to answer as follows:
In adults, the normal heart rate is in the range of 60-100 times/min, tachycardia when the heart rate is over 100 times/min. The causes of tachycardia can be emotional, stress, stimulants (coffee, tobacco), high fever, over-exercise, etc. However, tachycardia is also a sign of diseases. : hyperthyroidism, arrhythmia, heart valve disease, cardiomyopathy...
Therefore, you should go to the Hospital to be examined by a Cardiologist and perform some necessary tests to make a definitive diagnosis. and specific treatment methods.
If you still have questions about the heart beating 120-125 times/minute, you can go to the hospital of Vinmec Health System for further examination and advice. Thank you for trusting and sending questions to Vinmec. Wish you a lot of health.
Best regards!.