Sudden rapid heartbeat is considered to be palpitations, which may be caused by various reasons, such as physiological phenomena, arrhythmia, increased nerve sensitivity and other reasons. 1. Physiological phenomenon, such as emotional excitement, consumption of caffeine-containing beverages, strenuous exercise, alcohol consumption and so on. 2. Arrhythmia, any factor that causes a change in heart rate or rhythm can induce palpitations. Such as pre-systole, paroxysmal supraventricular tachycardia, sick sinus node syndrome. Arrhythmia is mostly seen in organic heart disease, such as hypertensive heart disease, mitral valve and (or) aortic valve insufficiency, etc. In addition, bad habits, endocrine diseases, digitalis drug poisoning can also be induced. 2. Increased neurosensitivity, mostly seen in peri-menopausal women due to the decline in estrogen levels, the symptoms mostly appear at night, accompanied by hot flashes, sweating and other manifestations. Usually correct bad habits, avoid emotional excitement, do not drink strong tea and coffee, the persistence of symptoms need to go to the hospital for a comprehensive examination, such as electrocardiogram, thyroid function, etc., in order to clarify the cause of the disease.