Hi, the normal mechanism is that when we breathe in air through the nostrils, small amount of it goes in to the eustachian tube and aerates the middle ear, this is very important for hearing because if the tube gets blocked then the problem of fluid filling happens which later gets infected to cause AOM .
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Sometimes the elasticity of the eustachian tube gets weakened, sudden loss of weight or loss of musculature.
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unless it troubles you, there's nothing to worry