Fast Heart Rate
A normal heart rate for a healthy adult is between 60 and 100 beats per minute. Heart rates of more than 100 beats per minute (tachycardia) can be caused by:
Babies and children younger than 2 years old have higher heart rates because their body metabolism is faster. Heart rates decrease as children grow, and usually by the teen years the heart rate is in the same range as an adult's.
A new fast heart rate may be caused by a more serious health problem. Heart disease or other medical conditions may sometimes cause a fast heart rate. A fast heart rate may cause palpitations, dizziness, lightheadedness, or fainting. Atrial fibrillation is the most common type of fast heartbeat. It causes the heart's upper chambers to beat irregularly, reducing blood flow to the heart muscle and to the rest of the body. Atrial fibrillation increases your chance of having a stroke or a blood clot in the lungs (pulmonary embolism).
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