The symptoms of atrial fibrillation are mainly as follows: a. Paroxysmal atrial fibrillation: sudden onset, palpitations, shortness of breath, precordial discomfort and anxiety. The duration of each episode varies, with short episodes lasting only a few seconds, frequent episodes, and long episodes lasting from several days to several weeks. Persistent atrial fibrillation: mainly related to the ventricular rate, manifested as: palpitations, shortness of breath, especially when the ventricular rate increases significantly after activity, persistent atrial fibrillation is easy to occur in heart failure. In atrial fibrillation, because the atria have no contraction, hemodynamic disturbance, easy to occur attached thrombus, leading to embolism of body and pulmonary circulation, with cerebral embolism and limb artery embolism as the most common. Third, if there is no other heart disease, atrial fibrillation when the ventricular rate is basically normal, the patient can have no symptoms, if there is other heart disease, it will aggravate the symptoms of heart disease, especially will aggravate heart failure. Fourth, the symptoms of atrial fibrillation are also affected by the sensitivity and tolerance of the patient’s perceived symptoms. Some patients can have obvious symptoms when atrial fibrillation first occurs, and some patients can gradually adapt as the course of the disease lengthens, and the symptoms may be reduced or even disappear.