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Several medical problems can occur when ascending to high altitude. The problems range from uncomfortable symptoms to life threatening conditions. The occurrence of these problems varies with the following:
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Possibly due to hypoxia (lack of oxygen). Symptoms occur 12-24 hours after ascent, decrease around the third day, and range from mild to moderate/severe.
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Results from swelling of the brain due to fluid leakage. Symptoms generally occur after 5 to 7 days at high altitude. This is a serious illness that could lead to death if unrecognized and untreated. NOTE: The diagnosis of severe AMS versus HACE is difficult. Always assume the worst.
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Results from fluid leakage into the lungs. Oxygen transfer from the lungs to the blood is impaired. HAPE is not caused by heart failure or pneumonia. This is a severe illness that could lead to death if unrecognized and untreated.
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