- The middle ear is a small compact space inside the eardrum, with a "pressure release valve" (leading to the sinuses) called the eustachiantube. Whenever the middle ear is subjected to rapid changes in air pressure due to depressurization or increased pressure (like what happens to passengers on airplane takeoff or landing), it seeks to adjust to these changes by expanding and contracting. Normally, the Eustachian tube is the organ responsible for maintaining equilibrium.
- In the case of sinus infection, Viral Rhinitis(common cold), or Allergic Rhinitis, the Eustachian tube becomes inflamed and narrowed, causing a buildup of pressure inside the middle ear. Inflammation in the ear due to atmospheric pressure changes is called, literally,barotitis.
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