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Acute Mountain Sickness.

It is the most common type of high-altitude illness and occurs in more than one-fourth of people traveling to above 3500 m (11 667 ft) and more than one-half of people traveling to above 6000 m (20 000 ft). Symptoms include headache, fatigue, poor appetite, nausea or vomiting, light-headedness, and sleep disturbances. Symptoms usually occur 6 to 12 hours after ascent and can range from mild to severe. Symptoms usually improve after 1 to 2 days if there is no further ascent, but they can sometimes last longer. In less than 1% of cases, symptoms can progress to high-altitude cerebral edema, a life-threatening condition marked by symptoms of wobbly gait, confusion, and decreased consciousness.