Barotitis media is an inflammation of the ear caused by changes in atmospheric pressure. It is also called aerotitis. This is a problem of inflammation or bleeding in the middle ear caused by a difference between the air pressure in the middle ear and that of the atmosphere - as occurs in sudden changes of altitude, in diving, and in hyperbaric chambers. During a sudden increase in ambient pressure, gas must move from the nasopharynx into the middle ear to maintain equal pressure on both sides of the tympanic membrane (ear drum). If the eustachian tube (connecting the middle ear to the back of the nose) is not functioning properly, as in upper respiratory tract infections or allergy, the pressure in the middle ear is lower than the ambient pressure. The relative negative pressure in the middle ear results in retraction of the tympanic membrane and a transudate of blood from the vessels in the lamina propria of the mucous membrane forms in the middle ear. Very severe press...