Barotrauma.This is damage brought on by an adjustment in ambient pressure. This occurs during climb and descent in a plane as well as whilst scuba diving. Clog of the Eustachian Tube leads to absence of equalisation of the stress in the center ear area with the outdoors. When the pressure changes during the tasks detailed over this leads to a pressure slope across the drum.
http://lukaskzeu898.bravesites.com/entries/general/what-triggers-heart-flutter-is-your-racing-heart-typical-