Many things: Anxiety, stress, caffeine, alcohol withdrawal, use of stimulant drugs, certain medical conditions (e.g. Thyroid disease, dehydration) can cause palpitations, which is the sensation of rapid heart beat. Please see a doctor if you haven't already done so. More information about palpitations: http://www.Webmd.Com/heart-disease/guide/what-causes-heart-palpitations.
Answered 5/13/2016
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