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Patulous eustachion tube.
from:http://medicine.yale.edu/surgery/ent/hearing/adult/diseases/patulous.aspx
A patulous Eustachian tube (PET) is another type of ETD which, though clinically less common, nevertheless results in symptoms which can be quite bothersome to the afflicted patient. This condition entails a Eustachian tube that is abnormally open, in some cases all or nearly all of the time, in other cases during periods of heavy respiration. General symptoms of PET include autophonia (hearing one’s own voice as abnormally loud), hyperacusis (hearing sounds in general as abnormally loud), and, less commonly, distortion to speech and to sounds in general. These symptoms may initially suggest a problem in the inner part of the ear and thus PET is often not recognized by the examiner.
Conditions which tend to be associated with PET include pregnancy, radiation therapy, hormone therapy, fatigue, stress, and weight loss. Additionally, anecdotal evidence suggests that some patients only experience symptoms or have an increase in symptoms during humid weather and especially during increased respiration in humid conditions (i.e. aerobic exercise in high humidity). ************