While the chamber is pressurizing, your ears will feel the change in pressure inside the chamber. Otherwise, it should be unnoticeable. To equalize the pressure and avoid the feeling of fullness in your ears, you will need to clear your ears by chewing(gum of food), swallowing, yawning. During the pressurization of the chamber, your mouth may become dry. Once the chamber is fully pressurized, your salivation will return to normal. Other than this ear pressure there are no unusual or different sensations. After using the oxygen chamber, one of the most intuitive feelings is refreshing, and you will feel full of vitality.