fast heart rate causes
What causes a rapid heart rate? Quick Answer. 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.
Heart rhythm problems. Palpitations are sometimes caused by a problem with the heart rhythm, such as: atrial fibrillation â a heart rhythm problem that can cause a fast, irregular heart rate. atrial flutter â a rhythm disturbance that can be fast and either regular or irregular.