Premature beats and atrial fibrillation are two different types of arrhythmia. Most patients with premature beats have no obvious symptoms, and common symptoms include palpitations (rapid heartbeat, often accompanied by panic), chest tightness, weightlessness, and cardiac arrest; most patients with atrial fibrillation feel panic, dyspnea, chest pain, fatigue, dizziness, and other symptoms. 1. Premature beats: the pathogenesis of premature beats is not very clear. It can occur in normal people, but it is more likely to occur in patients with cardiac neurosis and organic heart disease. Almost all patients with heart disease and 90% of the healthy population can have premature beats. Typical symptoms are chest discomfort, panic attacks, weak or “stopped” heartbeat, chest tightness, and a feeling of weightlessness similar to that of a fast elevator. Some patients may suffer from decreased blood flow and insufficient perfusion to important organs due to premature beats, which may lead to fatigue, shortness of breath, sweating, dizziness and other manifestations. 2. Atrial fibrillation: It is common in organic heart disease, such as coronary heart disease, rheumatic heart valve disease, cardiomyopathy, etc. It is also seen in hypertension, hyperthyroidism and other underlying diseases. In addition, there are some atrial fibrillation of unknown cause, which can occur during emotional excitement, surgery, exercise or heavy alcohol consumption. The incidence of atrial fibrillation is low in healthy people and increases dramatically with age. Most patients feel panic, dyspnea, chest pain, fatigue and dizziness. Some patients also have polyuria manifestations and decreased exercise tolerance. With symptoms of premature beats and atrial fibrillation, it is recommended that the cause be promptly investigated under the guidance of a doctor, and if it is a pathological change, standardized treatment can be prescribed by a doctor.