Rhythmic heartbeat is a disorder of the heart rhythm, which is an arrhythmic disease and may be caused by premature beats, paroxysmal supraventricular tachycardia, myocarditis, and atrial fibrillation. 1. Premature beats: they can also occur in normal people. Most of the mild premature beats do not have any special sensation, occasionally there is a feeling of weightlessness, and most of the people do not need to be treated. Severe patients may experience palpitations (rapid heartbeat, often accompanied by panic), chest tightness, and a feeling of the heart stopping. 2. Paroxysmal supraventricular tachycardia: manifested by a strong sense of heartbeat, polyuria, dyspnea as well as angina, heart failure and even sudden death. 3. Myocarditis: atrioventricular conduction block, in mild cases, there are no conscious symptoms, while in severe cases, there will be shortness of breath, chest pain, dyspnea, and symptoms of chaotic heartbeat. 4. Atrial fibrillation: patients consciously feel that the heart beats irregularly, fast and chaotic, belonging to the common types of clinical arrhythmia. When the patient has a chaotic heartbeat, he should go to the regular hospital in time, do electrocardiogram, cardiac ultrasound, etc., to clarify the cause of the disease, and take therapeutic measures according to the doctor’s instructions.