He clarified that this phenomenon is typically normal, stating, “If, every once in a while, you’re laying on your side and you hear your heart beating, it’s most likely your carotid artery basically sitting against your pillow.”

These arteries, which are major blood vessels of the heart, are located on either side of the neck before passing by the inside of the ears.

However, if you’re frequently hearing a noise, it can be an alarming sign.

Dr. Youn shared with his 8.4 million followers that if you constantly hear this sound, whether you’re lying down or standing, it could indicate a condition called pulsatile tinnitus.

Penn Medicine describes this condition as a variant of tinnitus, where individuals experience the perception of a continuous sound without an external source, such as buzzing or ringing.

Pulsatile tinnitus, on the other hand, presents as a rhythmic sound resembling a heartbeat, and it can be heard in the head, ears, or both.

While the doctor emphasized that this condition is usually “benign,” there are some potential concerns, and he recommended seeing a healthcare professional just to be safe.

This condition may be linked to high blood pressure or a sign that blood is flowing too quickly. It could also point to atherosclerosis, which refers to the hardening of the arteries and the disturbance of smooth blood flow.

However, hearing your heartbeat on your pillow could also be attributed to other factors, such as anemia, pregnancy, or even tumors.