The causes of tachycardia in the elderly include the following: 1. The tachycardia can be relieved naturally after the blood pressure is stabilized and the myocardial ischemia is corrected; 3. Tachycardia can also be caused by exertion, insomnia, overfed diet, drinking alcohol and strong tea, etc., with obvious symptoms. Actively find the cause of tachycardia, targeted treatment can reduce tachycardia episodes.