A heartbeat of 120 beats per minute is usually considered tachycardia, if accompanied by panic, dizziness, breathing difficulties and other symptoms, it is more dangerous and should be taken seriously. If you are in a state of stress, anxiety, fever, or after exercise, you may also reach 120 beats/min, so don’t worry too much. The normal human heart rate in a quiet state is generally 60-100 beats per minute, more than 100 beats per minute is usually tachycardia. In some people, the heart rate reaches 120 beats/min and there are no other uncomfortable symptoms, or it only appears occasionally and can return to normal on its own, so there is no need to worry too much. However, if it is accompanied by symptoms such as panic attacks that are difficult to relieve on their own, then related heart diseases such as sinus tachycardia and ventricular fibrillation should be considered and the patient should visit a cardiologist for relevant tests. In addition, fever, stress, exercise, etc. can also cause an increase in heart rate, so it is recommended to test the heart rate in a quiet state to avoid masking the condition. Heart rate of 120 beats per minute may also be due to hyperthyroidism, anemia and other diseases, and medication is recommended to stabilize the condition under the guidance of a medical professional. Some people can also experience corresponding symptoms after consuming beverages such as coffee and tea, and it is recommended to stop drinking them.