Atrial fibrillation is the generation of irregular impulses in the atria up to 350-600 times per minute, with a highly uncoordinated and chaotic fibrillation of the various parts of the atrial muscle fibers, resulting in the loss of effective contraction. The symptoms of patients with atrial fibrillation depend on the following factors: 1. Ventricular beat rate: easy to occur when the heart beats too fast or too slow. 2. Ventricular beat rhythm: the heart rhythm is absolutely irregular in atrial fibrillation and is more likely to be symptomatic when it is severely irregular. 3.Cardiac function status: the worse the cardiac function status, the more symptoms. 4.Concomitant diseases. 5, the sensitivity and tolerance of the patient’s perceived symptoms: when atrial fibrillation first occurs, there may be obvious symptoms, and as the course of the disease lengthens, some patients may gradually adapt, and the symptoms may be reduced or even disappear, but the harm is not reduced.