Atrial fibrillation after gastric surgery may be caused by postoperative stress or coronary heart disease. After gastric surgery, the body is in a state of stress, the sympathetic nerves will be excited after the surgery, just like the atrial fibrillation that occurs after excitement, exercise or drinking a lot of alcohol, often due to the state of stress, the sympathetic nerves are excited by the temporary contraction of the atria, the rhythm disorders will appear atrial fibrillation, this kind of atrial fibrillation will get better after the mood is calmed down. Atrial fibrillation after gastric surgery can also be caused by coronary artery disease and other heart diseases. Preoperative patients may suffer from heart problems, such patients may experience myocardial ischemia, causing arrhythmia, which may lead to atrial fibrillation, and take anti-arrhythmic drugs as prescribed by the doctor, such as amiodarone to carry out the treatment. Patients with atrial fibrillation after gastric surgery should take medication according to the doctor’s instructions in a timely manner, pay attention to monitoring, and usually must pay attention to rest, avoiding fatigue, emotional stress, and try to develop good habits, which is conducive to the control of the disease.