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Mastoiditis is a serious bacterial infection that affects the mastoid bone behind the ear. It's usually more common in children, although adults can also sometimes be affected. The mastoid bone has a honeycomb-like structure that contains air spaces called mastoid cells.
Key points. The mastoid bone is located in the inner ear and may not be visible due to the infection.1. The mastoid bone is located in your inner ear and may not be visible due to an infection. The most common cause of mastoiditis is a middle ear infection that has been left untreated. 1. The most common cause of mastoiditis, or infection of the mastoid bone, is a middle ear infection that has been left untreated.