Often prolonged exposure to air conditioning can lead to ear pain, due to a sharp change in temperature from a very hot environment to one with a much lower temperature. This problem is due to the blockage of the Eustachian tube between the nose and ear. In these situations, in fact, the pressure changes in and out of the Eustachian tube and if the air pressure becomes lower in the middle ear than in the auditory canal, the eardrum retracts inwards, causing pain.