I also have a relative who is a doctor/med school professor who does a lot of traveling, and has had to assist the crew three times with in-flight emergencies. One was a heart attack, one was deteriorating condition of an unknown cause (the flight was diverted to evacuate this man) and the third was a guy who had intense bladder pains mid-flight which turned out to be the result of downing a huge quantity of beer before the flight and being unable to urinate.
1. http://news.google.com/newspapers?id=ZBxOAAAAIBAJ&sjid=p...