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The eustachian tubes connect the inner ear to the nasal passage so that the atmospheric pressure is equalised across the eardrum when the weather changes or you walk uphill. The problem is that a simple tube would allow your ears to fill with snot and cocaine as you walk downhill, so whilst the equalisation is very rapid during ascent or depressurisation, the tube closes down to a small aperture on the way down, and if you have any infection, it may close completely against an increasing ambient pressure. This produces a pressure differential across the eardrum which can be painful or even damaging. Human aviators can pinch their noses and blow, or sing (Stuka pilots were encouraged to shout in a dive, but it scares the bejabers out of the passengers if I scream Auf Wiedersehen Tommy!, Tallyho!, Geronimo!, or Tora! when approaching Liverpool). It's a bit more difficult for thumbless sheep but a good Baa might clear the problem. If not, there is a surgical solution:http://figshare.com/articles/_Insertion_of_a_coronary_stent_into_the_Eustachian_tube_of_heathland_sheep_/1250727
A more subtle form of earache is due to the very high sound levels on a plane - loud enough to scare a sheep used to munching in a quiet pasture. I wear sound-absorbing earplugs on plane flights, and that gives my ears a rest from the noise. It also slows down the rate at which air pressure returns as the plane descends, and may assist with the more acute air-pressure problems described by alancalverd.These days, some people buy noise-cancelling earphones, but these won't help ewe with the air pressure. If ewe wish to do an experiment, put a noise-absorbing earplug in just one ear, and take it out when you leave the plane. I did this once (because I could only find one earplug), and sounds then seemed quite asymmetric for a while. (Don't do this if you are responsible for flying the aeroplane!)