http://www.youtube.com/watch?v=apqfBjTLZEU
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Many people experience barotrauma at some time. Barotrauma commonly occurs with altitude changes, such as flying, scuba diving, or driving in the mountains. If you have a congested nose from allergies, colds, or an upper respiratory infection, you are more likely to develop barotrauma. After examination of the ear, Hearing tests and CT Scan of the sinuses are done before starting treatment, medical or surgical.
This video explains it.