Sudden acceleration of heartbeat and dyspnea are mainly considered clinically in the following cases: 1. Cardiac causes. The most common is the sudden occurrence of tachyarrhythmia, such as atrial fibrillation, paroxysmal supraventricular tachycardia, ventricular tachycardia, etc., which can easily lead to sudden acceleration of the heartbeat. If the effective ejection of blood from the heart is affected by the acceleration of the heartbeat, resulting in insufficient blood and oxygen supply to the body’s tissues and organs, symptoms of dyspnea will occur. 2, the cause of the lungs. The most common is acute pulmonary embolism, such as patients due to bed rest or lower extremity activity reduction and other triggering factors, causing deep vein thrombosis of the lower extremities, this thrombus once dislodged causing acute pulmonary embolism, the patient will quickly hypoxemia, reflexively cause rapid heartbeat and dyspnea. 3, psychological factors. The most common are patients who stay up late, anxiety, lack of sleep and mental stress. Regular work and rest and necessary psychological guidance can help to improve.