Premature beats, i.e., preterm contraction, the dangers of frequent premature beats in the heart include triggered tachycardia, fainting, low blood pressure, heart failure, thrombosis, etc., related to whether there is organic heart disease and the degree of frequency. If the premature beats are occasional and without clinical symptoms, there is generally no harm, and regular observation is sufficient. Premature beats can be categorized into atrial, junctional and ventricular premature beats, of which the first two usually do not require treatment. 1. Atrial premature beats can trigger supraventricular tachycardia, which requires treatment. 2. Patients with severe organic heart disease who have ventricular premature beats with a high frequency can have angina, syncope, hypotension, and, in severe cases, heart failure due to insufficient return blood volume and insufficient cardiac ejection. It is necessary to treat according to the specific clinical conditions. 3. Premature beats belong to arrhythmia, is a kind of ectopic rhythm, is the heart potential pacing point active early beat, heart rate is faster, if premature beats cause hemodynamic changes can have thrombosis. If you suffer from frequent preterm contractions, you should seek medical attention and follow the doctor’s instructions.