Possible Eustachian: when you have nasal congestion, that swelling also involves the opening from the nose to the middle ear called the Eustachian Tube. When your ET is swollen, air in the middle ear gets absorbed, creating a vacuum. The you yawn or the tube opens, there is a crackling from the sudden change in air pressure. You also may be describing jaw joint swelling.
Answered 3/9/2017
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