Symptoms of atrial fibrillation vary depending on the type of atrial fibrillation, the ventricular rate, and the underlying heart structure and function of the patient. Symptoms of atrial fibrillation vary from person to person and are mainly related to the type of atrial fibrillation and the rapidity of the ventricular rate and underlying heart structure. Acute episodes of paroxysmal atrial fibrillation with fast ventricular rate may have symptoms such as panic, chest tightness, shortness of breath, etc., because the stable blood supply from the heart to other organs is affected, and in severe cases, dizziness, black haze or even fainting may occur; patients with underlying cardiac disease may have symptoms that induce or aggravate cardiac insufficiency, such as edema of the two lower limbs, and inability to fall asleep at night in the flat position. When the ventricular rate of paroxysmal atrial fibrillation is normal, some patients may also have no obvious symptoms. Persistent or permanent atrial fibrillation may be mild, and for patients without underlying heart disease, sometimes it only manifests itself as a long-term decrease in exercise tolerance and fatigue, poor appetite, etc., with no obvious palpitations, chest tightness and other heart-related symptoms, which are easily overlooked by patients. Patients with underlying heart disease may aggravate the deterioration of cardiac function. Chronic atrial fibrillation is more likely to form thrombus in the left atrium than acute atrial fibrillation, and acute thromboembolism can be caused by dislodgment of thrombus, among which cerebral thrombus is the most serious and common. Auscultation during an episode of atrial fibrillation reveals that the heart rate varies, the heart sounds are not equal in strength, the rhythm is absolutely irregular, and the palpable pulse rate is less than the heart rate. Acute paroxysmal atrial fibrillation ventricular rate faster may have palpitations, chest tightness, shortness of breath and other symptoms, chronic atrial fibrillation and other ventricular rate stabilization of patients may not have obvious symptoms. Atrial fibrillation can aggravate the existing underlying heart disease, induce or aggravate cardiac insufficiency, and need to pay attention.