A single episode of atrial fibrillation does not clarify the presence of cardiovascular disease, and some patients have idiopathic atrial fibrillation of unknown etiology. Atrial fibrillation is a relatively common arrhythmia in clinical practice. Some patients may manifest paroxysmal atrial fibrillation alone, but the patient does not have the risk factors that lead to atrial fibrillation, which is clinically defined as idiopathic atrial fibrillation, and it is not clear that the patient has cardiovascular disease. The occurrence of atrial fibrillation in some patients may be related to cardiovascular diseases, such as mitral stenosis, hypertension, etc. will lead to changes in the structure of the heart, changes in the structure of the heart will trigger the occurrence of atrial fibrillation, and this part of the patient when the occurrence of atrial fibrillation, there is already a clear cardiovascular disease. Cerebrovascular disease rarely leads to atrial fibrillation, but patients with atrial fibrillation can lead to the occurrence of cerebral embolism. Patients who develop atrial fibrillation should visit a hospital in a timely manner to assess the risk of the condition under the guidance of a physician and to develop the next step in the treatment program.