With<unk> , variations in upper airway pressure associated with respiration are transmitted to the middle ear through the Eustachian tube. This causes an unpleasant fullness feeling in the middle ear and alters the auditory perception. Complaints seem to include muffled hearing and autophony. In addition,<unk>  generally feels dry with no clogged feeling or sinus pressure. Patients hear their own voice or its echo from inside. They describe it as being amplified and unpleasant. Lying head down may help since it increases venous blood pressure and congestion of the mucosa.
Patulous Eustachian tube
Eustachian tube dysfunction
Persistent thyroglossal duct
Salivary gland hypoplasia
Velopharyngeal insufficiency
Salivary gland atresia
Tracheal agenesis
Velopharyngeal inadequacy