<unk>  can be caused by a number of factors. Some common causes include the flu, allergies, a cold, and sinus infections. In patients with chronic ear disease such as cholesteatoma and chronic discharge, studies showed that they suffer obstructive pathology at the ear side of the Eustachian tube. Given that proximity of that part of the Eustachian tube to the tympanic cavity, the site of frequent infections during childhood, it is logical to conclude that this segment of the tube experiences fibrosis and stenosis from recurrent infections. This is a possible explanation for the increased frequency of chronic ear disease in disadvantaged populations who lack access to medical care including antibiotics and tympanostomy tubes.
Eustachian tube dysfunction
Patulous Eustachian tube
Velopharyngeal insufficiency
Laryngotracheal stenosis
Laryngomalacia
Nasal septum deviation
Adventitial cystic disease
Laryngo-onycho-cutaneous syndrome