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Definition of Tachycardia The heart normally beats at a rate of about 60 to 100 beats per minute at rest. A rate faster than 100 beats a minute in an adult is called  tachycardia . Most people experience transient rapid heartbeats, called sinus tachycardia, as a normal response to excitement,anxiety,stress , or exercise. If tachycardia occurs at rest or without a logical cause, however, it is considered abnormal. Description of Tachycardia The two main types of  tachycardia     are abnormal supraventricular tachycardias (which originate in the upper chambers of the heart, the atria) and ventricular tachycardias (which originate in the lower chambers of the heart, the ventricles). Causes and Risk Factors of Tachycardia Sinus tachycardias are most likely to occur in those who are easily excitable, suffer anxiety, or drink a lot of caffeine-containing beverages. They may also been seen in people with thyroid disease, with fevers, or with certain drugs (especial...