Altitude sickness, also known as acute mountain sickness (AMS), is a common concern for trekkers and climbers in Nepal due to the high elevations in the Himalayas. It occurs when ascending to high altitudes too quickly, where oxygen levels are lower.
Common Trekking Areas with High Altitudes in Nepal
- Everest Base Camp (5,364m / 17,598ft)
- Annapurna Circuit (up to 5,416m / 17,769ft at Thorong La Pass)
- Manaslu Circuit (up to 5,160m / 16,929ft at Larke Pass)
- Langtang Valley (up to 5,000m / 16,404ft at Tserko Ri)
- Gokyo Lakes (up to 5,357m / 17,575ft at Gokyo Ri)
- Mera Peak (6,476m / 21,247ft)
Symptoms of Altitude Sickness
Mild AMS symptoms usually appear above 2,500m (8,200ft) and can worsen with increasing altitude.
Mild Symptoms (AMS)
- Headache
- Nausea & dizziness
- Shortness of breath
- Fatigue & weakness
- Loss of appetite
- Trouble sleeping
Severe Symptoms (HAPE & HACE)
If AMS is ignored, it can lead to life-threatening conditions:
- High Altitude Pulmonary Edema (HAPE)
- Severe shortness of breath, even at rest
- Persistent cough with frothy or bloody sputum
- Extreme fatigue
- Blue lips or fingernails
- High Altitude Cerebral Edema (HACE)
- Confusion or loss of coordination
- Severe headache and vomiting
- Hallucinations or irrational behavior
- Loss of consciousness
Prevention of Altitude Sickness
- Gradual Ascent
- Avoid climbing more than 300-500m (1,000-1,600ft) per day above 3,000m.
- Take rest days every 1,000m of ascent.
- Stay Hydrated
- Drink 3-4 liters of water per day.
- Avoid alcohol and caffeine, which can dehydrate you.
- Acclimatization
- Spend extra nights at intermediate altitudes.
- Follow the “climb high, sleep low” rule.
- Medication
- Diamox (Acetazolamide) can help with acclimatization (consult a doctor before use).
- Listen to Your Body
- Do not ignore symptoms.
- If symptoms worsen, descend immediately!
Treatment of Altitude Sickness
- Mild AMS: Rest, hydrate, and avoid further ascent until symptoms subside.
- Moderate AMS: Descend 300-500m and take oxygen if available.
- Severe AMS (HAPE/HACE): Immediate descent, oxygen therapy, and medical treatment.
Emergency Services in Nepal
- Helicopter Evacuation (Available in Everest, Annapurna & Langtang regions)
- Hospitals in Kathmandu & Pokhara (CIWEC, Norvic, Mediciti, and PAS Nepal are recommended)
