Whether or not sinus premature beats are harmful and how harmful they are is determined by the presence or absence of organic heart disease and the frequency of premature beats. Occasional premature sinus beats are not serious if they are not combined with other organic heart disease, but they are serious if they are frequent and combined with other heart disease. Normally, the heart beats according to certain electrical signals and rhythms. One signal of cardiac excitation is given before the next one continues. If an electrical signal suddenly appears early, before the previous signal has been reached, inducing the heart to beat, it becomes a premature beat. Depending on where the abnormal electrical signal occurs, it can be categorized as sinus, atrial, or ventricular premature beats, in which the abnormal electrical signal that occurs in the sinus node is called a sinus premature beat. If the number of sinus premature beats is small, and not combined with myocardial infarction, coronary heart disease, cardiomyopathy and other organic heart lesions, mostly due to fatigue, emotional excitement, staying up late, drinking alcohol, etc., at this time on the human body is basically no harm, pay attention to avoid triggering factors, and more rest can be. If the number of sinus premature beats is more and more frequent, or sinus premature beats combined with organic cardiac lesions, it is more harmful, and need to actively target the primary disease for treatment. Suffering from sinus premature beats should go to the hospital in time, so as to avoid delaying the condition.