The causes of sudden heartbeat acceleration include physiological factors such as fatigue, pathological factors such as coronary heart disease, and drug effects. 1. Physiological factors: nervousness, excitement, fear, anxiety, anger, stress, excitement and other mental factors can lead to sudden heartbeat acceleration; tiredness, late at night, heat, hormone secretion and other factors can affect the physiological condition, leading to heartbeat acceleration; drinking a lot of strong coffee, smoking, alcoholism and so on can also cause physiological heartbeat acceleration. 2. Pathological factors: coronary heart disease, hypertension, heart failure, hyperthyroidism, ischemic cardiomyopathy and other diseases can cause rapid heartbeat. 3. Drugs: adrenaline, atropine, aminophylline and other drugs can also cause a sudden increase in heart rate. There may be other reasons for the sudden increase in heart rate, so you can go to the hospital for examination to clarify.