This is some of the most common reason related to the normal physiological response.
For example, it's not surprising that this happens when a person exercise.
Other reasons could include stress, anger and the fight-or-flight response.
However, the stress and anger common in daily life may not be important factors.
Rather, an increase in the duration and severity of stress and anger can also lead to an increase in heart rhythm. The flight-or-fight response, or survival mode, is the body's response to immediate danger, and causing the heart to race as well.
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