Symptoms of atrial fibrillation are related to the speed of the ventricular rate. A fast ventricular rate can manifest palpitations, panic, chest tightness, shortness of breath, etc. A slow ventricular rate can have no obvious symptoms. Atrial fibrillation, or atrial fibrillation, is a common cardiac arrhythmia, which refers to the rapid disordered fibrillation wave instead of the orderly atrial electrical activity, causing atrial electrical activity disorder, the clinical symptoms are affected by the speed of the ventricular rate. When the ventricular rate is slow, patients may have no clinical symptoms. When the ventricular rate is too fast, it is characterized by heart beating, panic, restlessness, fatigue, palpitations, chest tightness, shortness of breath and other discomforts, and in severe cases, it can cause fainting. When the ventricular rate is greater than 150 beats per minute, symptoms such as angina and heart failure may also occur. When atrial fibrillation occurs, it is recommended to seek timely medical treatment and standardize the treatment under the guidance of professional doctors.