Lots of causes: Tachycardia (fast heart beat) or palpitations (being able to feel your heart beating) can be caused by stress, anemia, infection, fever, dehydration, medication, low blood sugar, hyperthyroidism and many many other causes. Some causes are problems with the heart, others cause your normal to beat too fast. Time to call your doctor and get checked out!
Answered 6/6/2014
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