The most common cause is heart failure. The amount of blood from the heart to the aorta decreases, causing insufficient blood and oxygen supply to all organs of the body, which reflexively causes panic and rapid heartbeat. 2. The most common endocrine system disease is hyperthyroidism, which causes the body to secrete too much thyroid hormone and excite the sympathetic nerve to cause panic and rapid heartbeat. 4, psychological factors, mostly seen in patients who stay up late, anxiety, tension, lack of sleep, pay attention to more physical exercise and good rest habits can help relieve.