Sinus premature heartbeat, which should be called sinus pre-systole, is a type of cardiac arrhythmia. Sinus precession is the early appearance of a heartbeat rhythm emanating from the sinus node in the midst of a normal heartbeat rhythm. The rhythm is a normal sinus rhythm, which means that the heartbeat starts at the sinus node, but the rhythm is irregular due to premature agitation of the atria or ventricles. An electrocardiogram can clarify the diagnosis of an episode of sinus pre-systole. Sinus pre-systole can occur in normal people or in patients with heart disease, and needs to be analyzed and judged on a case-by-case basis. Premature contractions may occur in normal people after overwork, prolonged smoking, alcoholism, coffee drinking, strenuous exercise, stress and anxiety. There is no need for treatment at this time, and the heart rhythm can return to normal after removing the triggers. Ventricular or atrial premature beats may also occur if you suffer from organic diseases, such as coronary heart disease, myocarditis, cardiomyopathy, rheumatic heart disease and so on. Frequent premature beats need active drug treatment, such as amiodarone, verapamil and so on. Severe premature beats are prone to malignant arrhythmias and require radiofrequency ablation. If there is any discomfort, you should seek medical advice and follow the doctor’s instructions.