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.

中文翻译：

---

急性高山病

它是最常见的高海拔疾病类型，在旅行到 3500 米（11 667 英尺）以上的人中超过四分之一，在 6000 米（20 000 英尺）以上旅行的人中超过二分之一。症状包括头痛、疲劳、食欲不振、恶心或呕吐、头晕和睡眠障碍。症状通常在上升后 6 到 12 小时出现，范围从轻微到严重。如果没有进一步上升，症状通常会在 1 到 2 天后改善，但有时会持续更长时间。在不到 1% 的病例中，症状会发展为高原脑水肿，这是一种危及生命的疾病，表现为步态摇摆不定、意识模糊和意识下降。