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Symptoms of Acute Mountain Sickness — What Should You Watch For?

May 8, 2026

Quick Answer

Symptoms of Acute Mountain Sickness include headaches, nausea, fatigue, and dizziness, which can worsen with altitude increase. Monitor for these symptoms and descend if they persist or intensify. Recognize early signs to prevent severe illness.

Recognizing Symptoms

Acute Mountain Sickness (AMS) is a potentially life-threatening condition affecting travelers to high elevations. Headaches are the most common symptom, often accompanied by nausea, fatigue, and dizziness. Other signs may include loss of appetite, insomnia, and shortness of breath. If symptoms appear at an altitude below 8,000 feet, reconsider travel to higher elevations.

Assessing Severity

Monitor symptoms closely, and seek medical attention if they worsen or persist. The Lake Louise Score is a useful tool for assessing AMS severity: assign 0-3 points for headache, nausea, fatigue, and dizziness. A score of 3 or higher indicates severe AMS, requiring immediate descent. Descent to a lower altitude is the primary treatment for AMS.

Precautions and Prevention

Preventing AMS requires careful planning and preparation. Ascend gradually, allowing at least 1-2 days for acclimatization at each 1,000-foot increase. Drink plenty of water and electrolyte-rich beverages to prevent dehydration. Avoid strenuous activity and high-altitude travel during periods of poor weather. Consider using a pulse oximeter to monitor oxygen saturation levels, and be aware of your body’s response to altitude changes.

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