Anything that damages heart tissue or puts a strain on the heart increases one's risk of tachycardia. Common medical conditions associated with tachycardia include overactive thyroid (hyperthyroidism) or underactive thyroid (hypothyroidism), underlying heart disease, diabetes, high or low blood pressure, sleep apnea, and anemia. Fatigue, heavy use of caffeine or alcohol, psychological stress, anxiety, smoking, and use of recreational drugs also put people at higher risk for tachycardia. Some medications can cause an abnormally fast heart beat, as well. Also, a family history of tachycardia puts you at higher risk of developing the condition yourself.
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