T70: Effects of air pressure and water pressure

T70.1: Sinus barotrauma

There is a certain pressure in every environment. The pressure in the air is atmospheric pressure and decreases with increasing altitude. The pressure in water is water pressure and increases with depth.

For example, the ambient pressure changes when changing altitude or while diving. There are various air-filled cavities in the body that constantly adjust to the ambient pressure.

If the ambient pressure suddenly changes, then sometimes the pressure in the body’s air-filled cavities may not adjust as quickly. The nasal sinuses, for example, are air-filled cavities in the body.

The nasal sinuses are located in the head and are connected to the nose. The nasal sinuses are lined on the inside with a moist mucous membrane that moistens and warms the air.

If the nasal sinuses are damaged by a change in pressure, the mucous membrane in the sinuses may become inflamed. There may then be a feeling of pressure in your head, for example. It may also be harder than usual to breathe through your nose.