As the hyperbaric chamber is pressurized, your eardrum is pushed slightly inward. This is normal, but it can be painful if you do not equalize the pressure in your middle ear. Prior to your treatment, your hyperbaric technologist will teach you ways like those below to relieve this sensation of pressure.
The Valsalva maneuver:
You may have to repeat these methods several times during the pressurization phase of treatment. If you have difficulty with your ears, please tell your tender or chamber operator immediately. Pressure sensation in the ear is to be expected, what is not to be expected is pain in the ear. Do not wait until the sensation of pressure starts to hurt.