Dr. Youn explained that hearing your heartbeat occasionally while lying down is generally normal. “If you’re lying on your side and hear your heart beating, it’s most likely your carotid artery basically sitting against your pillow,” he said. The carotid arteries are vital blood vessels located along the neck, near the ears, which can amplify the sound of blood flow.
However, the doctor cautioned that if this sound is constant, regardless of your position, it might signal a concerning health issue known as pulsatile tinnitus.
