On the internet, I am often consulted about treatment and surgery by patients who have either been diagnosed by their doctors or by themselves with abnormal open eustachian tube. However, since people do not know much about this disease and some patients do not really have abnormal open eustachian tube, I have listed below the symptom characteristics of this disease so that you can compare yourself and make a self-diagnosis first. The eustachian tube is a natural tube located between the middle ear cavity and the nasopharynx, so it is also called the Eustachian tube. It is the only natural passage between the middle ear and the outside world, and it has important functions, such as keeping the air pressure between the middle ear and the outside world in balance. In its normal state, it is closed so that sounds from the mouth and nasopharynx, such as your own speech or breathing, are not transmitted to the middle ear, causing enhanced self-hearing, and only opens for gas flow when swallowing, yawning, etc. In patients with abnormal opening of the eustachian tube, it also opens under normal circumstances, so it can be very disturbing to hear yourself loudly. The two most important symptoms are ear congestion and enhanced self-hearing. Because the eustachian tube is constantly open, patients will experience ear stuffiness, which many doctors will misdiagnose as eustachian tubeitis or eustachian tube stenosis, or even diagnose as secretory otitis media. Patients will often repeatedly aspirate their noses, causing the mucous membrane in the eustachian tube to form a live flap that blocks the eustachian tube thereby relieving symptoms. Due to repeated nasal aspiration, many patients will have a C- or B-curve during the acoustic conduction test, making them more likely to be misdiagnosed as having eustachian tube stenosis. Self-auditory enhancement is when you hear yourself breathing and speaking loudly, as if the sound is not passing through the outside world, but is conducted directly through your own nasopharynx into your ear. If you have ear congestion and self-hearing enhancement, you can further verify it by the following methods: make a quick and forceful nasal aspiration, and if it is relieved, then it is very likely to be an abnormal opening of the eustachian tube. Also, in case of abnormal open eustachian tube, when lying on your back or when sitting with your head lowered between your knees, both ear congestion and self-hearing enhancement can be significantly reduced or even disappear. If these conditions are met, further diagnosis by a doctor is required.