Atrial fibrillation without symptoms is still dangerous. Atrial fibrillation is a common arrhythmic disease among the elderly and can cause the following issues: First, it can induce heart failure. Atrial fibrillation is a common cause of acute heart failure, especially in the elderly, who may suffer from acute heart failure due to an episode of atrial fibrillation, particularly those with structural heart disease, making them more prone to developing heart failure. Second, it can lead to thromboembolic complications. Atrial fibrillation is a common cause of thromboembolic complications. These complications are unrelated to whether the atrial fibrillation is symptomatic or not. When atrial fibrillation persists, it significantly increases the chances of forming atrial thrombi. If a thrombus dislodges, it can lead to the occurrence of thromboembolic events, such as a stroke.