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This is called tachycardia.
See your doctor for tests and a possible diagnosis.
It can be caused by any number of things, but should be checked out. When your heart races, it loses its pumping efficiency which puts you at risk for heart attack and stroke.
The maximum safe heart rate (enduring) is considered 220 - age in years. This is the rate that your heart can pump during exercise or strenuous activity. It may peak above this but shouldn't beat continuously at that rate.
The normal behaviour of the heart's regulatory system is to have it pump based on demand ... so if you have a sudden need to pump blood, such as when exercising, hormones, like adrenaline will make it pump faster. Also, if your blood pressure drops, your heart will pump faster. If you have a fever, your heart rate will go faster to get more whitecells to the site of the infection to help kill off the infection. If one of these system goes haywire, your heart can race or slow.
Since there are so many possibilities, it's impossible to speculate, and why you need to see a doctor. If it happens more frequently, or it happens and doesn't drop quickly, call for paramedics. In the meantime, make an appointment with your doctor.
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