The risk factor of atrial fibrillation is very high. Now people have a bad tendency in diet, which is high in fat, sugar, protein and salt, which can easily lead to hypertension, diabetes, coronary heart disease and atrial fibrillation. The risk factor of atrial fibrillation is very high. At present, people have a very bad tendency in diet, which is high in fat, sugar, protein and salt, which can easily lead to hypertension, diabetes, coronary heart disease and atrial fibrillation. In addition, drinking alcohol may lead to heart failure, liver cirrhosis, brain injury and atrial fibrillation. Atrial fibrillation is the most common persistent arrhythmia. Atrial fibrillation refers to the loss of normal contraction and relaxation activities of myocardium, which is replaced by rapid and uncoordinated weak peristalsis, resulting in the loss of normal and effective contraction of atrium. The patient's atrial contraction is too fast and irregular, which leads to blood not being completely pumped out of the atrium and staying in the atrium, leading to thrombosis. Blood clots fall off, and these tiny blood clots flow all over the body with the blood. However, the blood vessels in the brain are densely distributed and slender, and thrombosis is easy to block the blood vessels in the brain, forming cerebral vascular embolism, which in turn leads to ischemic stroke. It is conceivable that the harm of atrial fibrillation is so great that it affects people's daily life. The simplest and easiest sign to identify atrial fibrillation is irregular pulse. Symptoms may include palpitation, chest pain or discomfort, shortness of breath, dizziness and fainting. There are also many patients with atrial fibrillation who have no symptoms or whose symptoms are obvious and specific. Atrial fibrillation is usually diagnosed after stroke. The biggest harm of atrial fibrillation is cerebral embolism, which leads to long-term death equivalent to coronary heart disease. Many people think that atrial fibrillation does not affect life span, but patients with atrial fibrillation will feel uncomfortable in the early stage, usually adapt after a few years, but it will have an impact on patients' long-term life. Experts said: From the earliest learning process of medicine, we know that atrial fibrillation will only affect about 20% of heart function. However, current knowledge and research show that this understanding is wrong. If it affects the heart function, it will affect the long-term life.