0 Morty Asked: May 21, 2019In: Biology Why does our hearing lessen or change when yawning? 0 Why does our hearing lessen or change when yawning? In: Biology Share Facebook 3 Answers Voted tyler1128 Added an answer on May 21, 2019 at 3:21 pm You have a tube called the Eustachian tube connecting your inner ear to your nasal cavity. It is usually closed, but things like yawning can cause it to open, which lets pressure equalize, but makes an audible change in how you perceive sound. 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp kassychj7 Added an answer on May 22, 2019 at 6:03 am The reason why we don’t hear any external sound while yawning is that, when the Eustachian tube is opened, the source of the sound is now actually two – The ear canal and the Eustachian tube. The sound through the Eustachian tube fills the middle ear, which thereby also reduces the ability to amplify the sound from the ear canal. This is the reason, why we hear our internal sounds more, when we yawn or stretch. This opening of the tube is just temporary while yawning, stretching, and a few people develop the ability to open it voluntarily 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Rhynchelma Added an answer on May 21, 2019 at 5:12 pm [One or two have asked before.](https://www.reddit.com/r/explainlikeimfive/search/?q=hearing%20yawning&restrict_sr=1&sort=new) 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Attachment Select file Browse Featured image Select file Browse What is the capital of UK? ( London ) Save my name, email, and website in this browser for the next time I comment.