Being at a high altitude can cause difficulty breathing, but if you are traveling above 8,000 feet, you likely already know this is possible and might not be surprised when it happens.
Difficulty breathing at high altitudes is one of the symptoms of altitude sickness, along with sleep problems, fatigue, and loss of appetite. Some people are more prone to difficulty breathing at high altitudes, like those with a lung or heart condition, are pregnant, or have a history of altitude sickness.

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