What Causes a Rapid Heart Rate?

RapidEye/iStock / Getty Images Plus/Getty Images

According to WebMD, a rapid heart rate, also referred to as heart palpitations, can be caused by a variety of factors, including anxiety, the use of stimulants or caffeine, stress, and hormonal fluctuations during pregnancy. In certain cases, a rapid heart rate can signify an underlying heart condition, so it is important for individuals experiencing unexplained heart palpitations to consult with a physician to ensure a proper diagnosis.