The sudden increase in heart rate can be due to physiological or pathological reasons. Physiological causes are common during strenuous exercise, nervousness, and emotional excitement, resulting in increased sympathetic excitability, which leads to increased heart contraction and faster heart rate. Pathological causes of sudden increase in heart rate are common in tachyarrhythmias, such as paroxysmal supraventricular tachycardia, rapid atrial fibrillation and atrial flutter. If the heart rate increases and strengthens continuously without relief, it is important to go to the hospital as soon as possible to improve the electrocardiogram and other tests in order to clarify the cause of the increased heart rate and strengthening so that timely treatment can be given.