Breathing sound in the left ear may be related to the abnormal opening of the Eustachian tube and perforation of the tympanic membrane in the left ear. 1. Abnormal opening of the Eustachian tube: When the Eustachian tube is abnormally open, the Eustachian tube pharyngeal opening in the nasopharynx is open, and the nasal cavity is connected to the middle ear drum chamber cavity, so when the air enters into the drum chamber from the Eustachian tube during the exhalation, it will hit the tympanic membrane, and with breathing, it will feel the ear ringing like breathing. 2 perforated eardrum: a disease in which the tympanic membrane is broken due to inflammation, trauma, etc., and the outer ear is connected to the middle ear cavity. When the patient breathes, the airflow inside the tympanic chamber can be exhaled through the perforated part, and the outside air can be sucked into the tympanic chamber as well as nasopharyngeal structure through the perforation, and the breath sound of the patient himself can be smelled at this time. If you find that you can hear breathing sounds in your ears, we recommend that you seek medical attention to clarify the cause of the disease.