The normal human heart rate is 60 to 100 beats per minute, when the heart rate exceeds 100 beats per minute it is called tachycardia. Transient tachycardia may be related to mental stress and strenuous exercise. When tachycardia occurs over a long period of time, it may be a precursor to hyperthyroidism, cardiac arrhythmia, hypertension and other cardiovascular diseases, anemia, and psychiatric and psychological disorders. 1. Hyperthyroidism: When the body has hyperthyroidism, it is easy to secrete too much thyroid hormone, leading to exuberant metabolism and rapid heartbeat, which may be combined with easy hunger and shaky hands. 2. Arrhythmia: The common cause of tachycardia in adult population may be related to arrhythmia, especially supraventricular tachycardia, which is often associated with a feeling of panic, and requires radiofrequency ablation for treatment. 3. Hypertension: When acute and chronic hypertension occurs in the human body, the elasticity of blood vessels decreases and the blood pressure rises, which can easily lead to an increase in the ejection work of the heart and cause tachycardia. 4. Anemia: anemia patients blood transport oxygen hemoglobin than in the healthy population is reduced, resulting in a decrease in oxygen circulation, in order to increase the supply of oxygen, the heart to speed up the blood transfusion, resulting in an increase in heart rate. 5. Other causes such as long-term mental stress effects. When there is a transient increase in heartbeat, it may be related to fatigue, hunger, infection, etc., which generally does not have much effect on the body, and requires sufficient rest and avoidance of the causative factors; when there is a prolonged manifestation of tachycardia, it is necessary to be vigilant, and go to a specialized clinic in time for treatment as prescribed by the doctor.