It can cause the heart to beat very quickly or erratically.
Supraventricular tachycardia – A rapid heart rate originating above the ventricles (lower heart chambers). These are classified by location, and type of heartbeat. Palpitations can also result from a range of heart arrhythmias. The body’s response to medications such as thyroid pills, cold medicines, and asthma drugs. 
Hormone changes associated with menstruation, pregnancy, or menopause.
Caffeine, alcohol, tobacco, or diet pills. Palpitations can occur for a variety of reasons unrelated to heart disease. “Patients frequently will feel their skipped beats more at night, when they’re lying in bed and nothing is distracting them from it.” Diagnosing palpitations Then I get a sense of whether we’re dealing with isolated skipped beats or a more sustained arrhythmia,” says Marine. “I ask them to tap out what their heartbeat feels like. And you could feel this sensation in your chest or your neck. You might feel like your heart is thumping, racing, or fluttering. Palpitations are characterized as a general or heightened awareness of your own heartbeat – whether it’s too fast, too slow, or otherwise irregular. Joseph Marine, M.D., vice-director of the Division of Cardiology at Johns Hopkins, starts his evaluation by asking his patients what they hear. They may feel alarming, but do not always reflect a serious heart condition. Palpitations are symptoms of everything from short or long-term stress to a variety of arrhythmias (irregular heartbeats).
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