Premature beats generally refer to early heart beats, clinically known as preterm contractions. The causes of premature beats may be related to functional premature beats, cardiac lesions, medications and so on. 1. Functional premature beats: premature beats can occur in normal people, such as emotional excitement, fatigue, heavy smoking and drinking, etc. Premature beats may also occur, and most of the premature beats have no obvious symptoms. 2. Heart disease: Patients who suffer from coronary heart disease, valvular disease, cardiomyopathy and other heart diseases may cause premature heart beats, which may be accompanied by symptoms such as chest tightness and dizziness. 3. Drugs: If the patient applies drugs such as digitalis and tricyclic antidepressants, premature beats may also occur. If the symptoms of premature beats occur frequently and last for a long time, it is recommended to consult a doctor in time. Other conditions can also lead to premature beats, it is recommended that patients with symptoms of premature beats seek medical attention in a timely manner, to clarify the cause of the disease under the guidance of the doctor for appropriate treatment.