Travel Tips
Nepal Altitude Acclimatization Guide
Altitude sickness is a real risk in Nepal. Understanding acclimatization and recognising symptoms early can make the difference between a great trek and a medical emergency.
Overview
Altitude sickness (Acute Mountain Sickness or AMS) can affect anyone regardless of fitness level. It occurs when you ascend too quickly and your body does not have time to adjust to lower oxygen levels. Symptoms typically appear above 2,500 meters and range from headache and nausea to life-threatening conditions.
The golden rule of high-altitude travel: ascend slowly, and descend immediately if symptoms worsen.
Key Tips
Follow the "climb high, sleep low" principle. On major treks, rest days every 1,000 meters of elevation gain are standard protocol. The standard Everest Base Camp itinerary includes acclimatization days at Namche Bazaar and Dingboche for good reason — do not skip them.
Drink 3 to 4 litres of water per day at altitude. Avoid alcohol and sleeping pills in the first days at altitude, as both suppress breathing. Diamox (acetazolamide) prescribed by a doctor can help with acclimatization — discuss this before your trek.
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Symptoms of AMS: headache, nausea, fatigue, dizziness, loss of appetite. If these progress to confusion, inability to walk straight, or fluid in the lungs (High Altitude Pulmonary Edema), descend immediately and seek medical help.
FAQ
At what altitude does AMS typically start?
Most people begin to notice effects above 2,500 meters. Kathmandu at 1,400 meters is usually fine. Serious AMS risk begins above 3,500 to 4,000 meters on trekking routes.
Does fitness level affect altitude sickness risk?
No — altitude sickness can affect anyone, including very fit athletes. There is no reliable way to predict who will get it. Ascending slowly is the only proven prevention method.
What is HACE and HAPE?
HACE (High Altitude Cerebral Edema) causes brain swelling and confusion. HAPE (High Altitude Pulmonary Edema) causes fluid in the lungs. Both are life-threatening emergencies requiring immediate descent and evacuation.
