A pulse that stops for a while is often considered to be caused by atrial fibrillation, premature heartbeat or atrioventricular block. 1. Atrial fibrillation: The irregularity of the atrial fibrillation leads to irregular ventricular rate and pulse, and intermittent pause. And because the ventricular beat is too weak to open the aortic valve, or the arterial blood pressure wave is too small to conduct to the peripheral arteries, resulting in the pulse rate is smaller than the ventricular rate, the pulse intermittent pause. 2. Premature cardiac contractions: also known as preterm asystole, including atrial premature contractions and ventricular premature contractions, due to the premature beating of the heart, resulting in an irregular ventricular rate, pulse rate, and the appearance of a pulse that stops for a while. Premature cardiac contractions can also be accompanied by symptoms such as chest tightness and dizziness. 3. Atrioventricular block: In second degree type II atrioventricular block, the signal of heartbeat cannot be transmitted downward, and there is a sudden cardiac arrest, which leads to intermittent pulse stoppage. It is recommended to consult a doctor in time to identify the cause of the disease and take active treatment.