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What Causes "Popping of the Ears" during a Sinus Infection?

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I am getting over a sinus infection. There is now very little mucus and I can breath with ease. I have been taking 1500MG of Amoxicillin per day for 9 days now. For the past 5 days my ears have been "popped". Are "popping" of the ears common with sinus infections? Is this possibly something more serious than "popped" ears? What can I do to "un pop" my ears?

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replied April 3rd, 2006
Ear, Nose & Throat Disorders Answer A651
Sinus inflammation is usually followed by inflammation of the nose cavity and upper part of the pharynx (nasopharynx). The nasopharynx connects both middle ear cavities through the Eustachian tubes. When the nasopharynx is inflamed, the swollen nasopharyngeal mucosa closes the Eustachian tubes’ openings into nasopharynx and stops the communication between the nasopharynx and middle ears. Because there is no communication with the nasopharynx, the air in the middle ears becomes trapped. This trapped air is absorbed after time and air pressure in the middle ears decreases. Decreased air pressure in the middle ear causes secretion of serous liquid from the middle ear's mucosa into the closed cavities of the middle ear. This liquid, present in middle ears, causes the feeling of “popped ears”. When the inflammation/infection in the sinuses and nasopharynx is cleared, the communication between the nasopharynx and middle ears will be re-established and the “popping” will disappear.
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