What does a type C tympanogram suggest about pressure in the ear?

A type C tympanogram is indicative of negative pressure in the middle ear, which often suggests Eustachian tube dysfunction. This type of tympanogram is characterized by a significant downward shift in the peak admittance level, showing that the pressure in the middle ear is lower than atmospheric pressure. The negative pressure can result from various factors, including allergies, colds, or sinus infections, all of which can lead to improper function of the Eustachian tube that normally helps to equalize ear pressure.

This negative pressure condition may result in symptoms such as a feeling of fullness in the ear or temporary hearing loss, and if untreated, it can sometimes lead to complications like otitis media. Understanding this relationship between tympanograms and middle ear pressure is crucial for hearing aid dispensers and audiologists when assessing ear health and planning appropriate interventions.