Just in time for the travel season, here is a guide to travel and altitude sickness that can help you prepare for any destination. The term “altitude sickness” describes a group of disorders affecting the lungs, brain, and central nervous system after travelers arrive at an elevation over 8,000 feet (2,500 meters). The most common altitude-related disorder is acute mountain sickness, or AMS. The hallmark diagnostic feature of AMS is headache. AMS occurs in persons who have recently arrived at altitude greater than 8,000 feet suffering dull, throbbing...