Efficacy of Balloon Dilation of the Eustachian Tube in Eustachian Tube Dilatory Dysfunction

Inclusion Criteria (Chronic ETDD): * \>3 months of symptoms of ETDD (otalgia, ear pressure, muffled hearing, tinnitus, cracking or popping, feeling clogged) persistent at enrollment * Persistence of symptoms despite \>4 weeks INCS or \>7d course of systemic steroid within 6 months from enrollment * Documented Type B or C tympanogram at or within 6 months from enrollment * ETDQ7 ≥ 2.1 at enrollment Inclusion criteria (baro-challenge ETDD): * \>12 months of baro-challenge induced symptoms occurring at least every 4 months within the past year * Symptoms include otalgia, ear pressure, muffled hearing, tinnitus, cracking or popping, feeling clogged, vertigo, or facial nerve palsy, which resolve within 3 days of pressure equalization. * Failure of at least one of: topical/oral decongestant, pneumatization device, and/or pressure relief ear plugs. Exclusion Criteria: * Signs/symptoms of patulous eustachian tube dysfunction (autophony, tympanic membrane movement with breathing) * Adjunctive surgical procedure needed (ex. septoplasty, tympanostomy tube) * Presence of a tympanic membrane (TM) perforation or tympanostomy tube * Fluctuating SNHL, AOM, grade IV TM retraction, or tympanosclerosis of \>50% of the TM * Uncontrolled sino-nasal disease, reflux, TMJ disorder, immunodeficiency, or allergies * Known ICA dehiscence of the bony ET of the symptomatic ear * Recent head and neck surgery within the past 3 months or planned procedure during study * History of radiation to the head and neck * History of craniofacial abnormality * Prior ET intervention * Psychiatric condition or cognitive impairment which precludes capacity to consent.