In case of problems of hearing it is natural that the external auditory canal and the middle ear are examined for infections or obstructions.

It is not useful to perform a measurement of hearing when there is an ear plug in the ear canal, because the measurement would then give a false image.

Sometimes it is necessary to carry out additional examinations such as a CT or NMR (MRI). This can be important to detect inflammation and congenital or acquired malformations of the middle ear.