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This is frank tachycardia and can be due to a number of reasons. Have you always had a fast heart rate? Have you had any previous cardiac history? Have you been feeling tired on exercising/walking or have had any dizziness? It is very difficult to say really why this could be caused without a full history.

However, an increased heart rate could be due to an overactivation of one of the bodies' nervous systems that is called the sympathetic nervous system (the "fight" reaction). It could also mean that your heart is not pumping much blood out with each contraction, so the heart rate increases to maintain the total amount of blood being pumped per minute.

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