Atrial fibrillation, that is, atrial fibrillation, is generally due to organic heart disease, other underlying diseases, part of the cause is unknown, can be caused by emotional excitement, alcohol consumption and other reasons. 1. Organic heart disease: If you suffer from heart disease, such as coronary heart disease, rheumatic heart disease, mitral stenosis, pulmonary heart disease, congenital heart disease, cardiomyopathy, pre-excitation syndrome, etc., you are prone to atrial fibrillation. For example, congenital septal defect in congenital heart disease will lead to myocardial hypertrophy, atrial cavity enlargement and so on, resulting in electrophysiological disorders of the left atrium and atrial fibrillation. 2. Other underlying diseases: common hyperthyroidism, etc., due to the direct effect of thyroid hormones on the myocardium, so that the myocardial contractility increased, the heart rate accelerated. When the body’s thyroid hormone secretion is excessive, it is easy to cause atrial fibrillation. 3. Unknown cause: Some atrial fibrillation is of unknown cause, which can occur in normal people, due to emotional excitement, drinking a lot of alcohol, exercise and other factors. Timely treatment of atrial fibrillation can control the development of the disease, but delayed treatment can cause heart failure and other complications, affecting life and health. It should be treated promptly under the guidance of a doctor to improve the prognosis.