Atrial fibrillation (AF), the full name of AF, is a serious clinical arrhythmia. With the growth of age, the incidence of atrial fibrillation is also gradually rising, many patients with atrial fibrillation do not have obvious clinical symptoms, and believe that atrial fibrillation is not terrible and does not require treatment, in fact, this is a misconception of many asymptomatic atrial fibrillation patients, the following talk about the specific hazards of atrial fibrillation are what? First, when the ventricular rate of atrial fibrillation increases, there will be obvious clinical symptoms, and even directly affect the quality of life. Rapid heart rate and irregular heartbeat rhythm will make patients feel panic, chest tightness, sweating, weakness, and even fainting, which affects daily life and work. Moreover, many patients with atrial fibrillation have prolonged episodes of symptoms, which can lead to psychological problems, such as anxiety, depression, and fear of disease. Second, long-term rapid heart rate can gradually cause heart enlargement and heart failure. Patients with atrial fibrillation continue to fibrillate and lose their normal contractile function, but the atria are enlarged, myocardial fibrosis is aggravated, the heart ejection is reduced and heart failure is triggered. In addition, atrial fibrillation itself can cause tachycardia cardiomyopathy due to long-term rapid heart rate, which can further aggravate heart enlargement and heart failure, and serious patients can show symptoms of heart failure such as shortness of breath, weakness, wheezing and difficulty in breathing after activity. Studies have shown that atrial fibrillation and heart failure are causal and form a vicious circle. Patients with atrial fibrillation combined with heart failure have a very poor long-term prognosis, with a significant increase in rehospitalization, hospital days and in-hospital mortality. Third, the most serious danger for patients with atrial fibrillation is thrombosis and embolism of the body circulation. The mechanism of thrombus formation is that when patients have atrial fibrillation, the left atrium loses its contraction function and is in a state of fibrillation, blood is easily stagnated in the atrium and thrombus is formed. If the thrombus is dislodged, it can travel throughout the body with the blood flow, with cerebral embolism being the most common and most serious. Studies have shown that atrial fibrillation increases the risk of stroke fivefold and is associated with high rates of disability, death and recurrence.