Patients with atrial fibrillation can use steroids, but in principle, it is best not to use them. This is because the use of steroids can cause excitement of the sympathetic nerves, leading to an increased heart rate, which in turn can trigger an episode of atrial fibrillation and cause uncomfortable heart symptoms, such as palpitations, chest tightness, shortness of breath, and difficulty breathing. Of course, atrial fibrillation is not a contraindication for the use of steroids. If the condition requires it, such as during an asthma attack or certain immunological diseases, steroids can be used. When using steroids, it is important to strengthen observation and inform the patient to seek timely medical attention at a hospital if symptoms of an atrial fibrillation episode, such as palpitations or chest tightness, occur.