Atrial fibrillation itself is not scary, the scary thing is that atrial fibrillation causes blood clots to fall off and cause blood vessel blockage, which can lead to sudden death in serious cases. 1. Atrial fibrillation is not terrible: the atrium itself pumps out blood accounting for 25% of the blood pumped out by the heart. Atrial fibrillation leads to the loss of the atrial pumping function, but the impact on the body is not very great, and the heart reserve is strong enough to compensate for it. 2. Embolism caused by blood vessel blockage: poor blood flow in the trembling atria, blood stagnation, the formation of blood clots over time, i.e., blood clots, blood clots with the blood circulation to reach all parts of the body, clogging the arteries caused by arterial ischemia of the organs supplied by the arteries, which can lead to necrosis and varying degrees of dysfunction. For example, blockage of arteries in the brain can lead to stroke, and blockage of arteries in the limbs can lead to necrosis of the limbs, and in severe cases, amputation of the limbs is required or even life-threatening. This is why atrial fibrillation is not scary, what is scary is that atrial fibrillation leads to dislodgment of blood clots. If you are diagnosed with atrial fibrillation, you should actively follow the instructions of your doctor for anticoagulation therapy.