The sound of heartbeat in the left ear belongs to the performance of tinnitus, which may be caused by physiological tinnitus, non-vascular tinnitus, vascular tinnitus such as jugular vein bulboma or tympanic ventricular body tumor and so on. 1. Physiological tinnitus: Normal people can feel the sound of blood vessel pulsation when they are active or lying on their side, which belongs to physiological tinnitus, i.e., body sound, and the sound can be disappeared after the change of body position. 2. Non-vascular tinnitus: it is related to myoclonus of head and neck, such as palatal myoclonus, stapedius muscle or tympanic membrane tensor muscle myoclonus, the rhythm of this kind of tinnitus is not in line with heartbeat rhythm, but is related to myoclonic rhythm in myoclonic seizure. 3. Jugular vein bulboma: due to the arterial blood flow through the sinusoidal cavity of the tumor, vortex can be formed as well as its jet effect, the blood flow rate is uneven, forming murmur, and the patient can hear pulsatile tinnitus when stimulating the auditory nerve and cochlear nerve near the tumor. 4. Tumor of the tympanic cavity: the tumor is located in the tympanic cavity and belongs to vascular tumor, which can also produce pulsatile tinnitus and hearing loss in line with the pulse rhythm. If you hear tinnitus from time to time, it is recommended that you go to the hospital specialist in time to clarify the cause of tinnitus, and then treat the cause and symptoms.