Most sinus arrhythmias are a physiological phenomenon and do not necessarily indicate heart disease. Sinus rhythm originates from the sinus node and has an irregular rhythm with a difference of more than 120 milliseconds between adjacent cardiac cycles and often coexists with sinus bradycardia. If sinus arrhythmia is present without clinical manifestations, no special treatment is needed, and a good lifestyle is maintained. If it is accompanied by other uncomfortable symptoms such as chest tightness, panic, dizziness, etc., it may be related to heart diseases such as congenital heart disease, myocardial ischemia or hyperthyroidism, anemia, etc. It is a symptom caused by certain disease factors that can affect the heart to different degrees and can be mostly relieved after treatment of the primary disease. In daily life, it is important to maintain a good sleep, do not stay up late for a long time, and also pay attention to a low-salt, low-fat diet, strengthen exercise, and keep a relaxed mood.