Sinus arrhythmia is mostly caused by physiological factors and in most cases cannot be called heart disease. Sinus arrhythmia refers to the normal rhythm of the heart, that is, sinus rhythm, but the beating is irregular, the biggest possibility is poor rest, mental stress, or drinking alcohol, strong tea and other stimulating beverages, or strenuous exercise and so on, if there is no combination of other obvious symptoms, usually do not need special treatment. Sinus arrhythmia may also occur in a few patients with cardiovascular diseases, such as coronary artery disease or heart failure, because insufficient blood supply or cardiac insufficiency may also trigger the heart to undergo rhythmic abnormalities and sinus arrhythmia may occur. In addition, non-cardiac diseases such as electrolyte disorders or thyroid dysfunction may also cause sinus arrhythmia. Patients who experience sinus arrhythmia only occasionally do not need to worry or special treatment, but if the symptoms are more serious or persistent, it is still recommended to go to the cardiology department of a regular hospital for consultation.