The fact that you can hear your own heartbeat may be caused by strenuous exercise, mental stress, and organic heart disease. 1. Strenuous exercise: after strenuous exercise, the heart pumps blood faster, causing the heart muscle contraction function to increase, thus leading to hear the heartbeat. After resting for a while, the heartbeat will not be heard again when it returns to normal. 2. Mental tension: due to excessive mental tension and anxiety, patients may cause symptoms of rapid heartbeat, resulting in patients can hear their heartbeat. 3. Organic heart disease: patients suffering from aortic valve, mitral valve closure insufficiency and other heart valve diseases, causing changes in the normal heart sound. This leads to the phenomenon of hearing the heartbeat, accompanied by chest tightness, chest pain and other symptoms of chest discomfort. When you can hear your own heartbeat, if you suspect that it is caused by a disease, you should go to the hospital in a timely manner, to clarify the cause of the disease and then treat it.