Besides the middle ears, there are more gas filled cavities in the head: the main airways (nose, oral cavity, rhino-pharynx), and the paranasal sinuses. As long as their connections with the rhino-pharynx are intact and unclosed, e.g. by swollen mucosa due to an upper respiratory tract infection, pressures will equalize automatically in the sinuses without any problem.

Figure 1.3-2. Location of sinuses (Graphic by J. Mair4)
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