If the patient feels that the heartbeat is fast all the time, the common cause is external factors, including exercise, emotional excitement, too cold or too hot weather can cause a fast heartbeat, often as a physiological reflex, and the heartbeat can be restored by removing the trigger. A fast heartbeat can also occur if you take related medications, strong coffee, strong tea, or chocolate. Whether the fever is caused by viral infection or bacterial infection, the heartbeat will be fast. At this time, the fast heartbeat is the body’s normal stress response, and treatment of the primary cause should be the main focus. The endocrine aspect including hyperthyroidism will cause a fast heartbeat, timely treatment of hyperthyroidism, the symptoms of fast heartbeat will be relieved. The most important thing is the heart disease itself, many heart diseases will be manifested as a fast heartbeat, such as cardiomyopathy, coronary heart disease, hypertensive heart disease, if the heart itself causes a fast heartbeat, you need to promptly seek medical attention to find the cause, timely treatment.