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This article keeps the decision near the top, separates planning guidance from changing conditions and points you back to the complete internal library.
Browse the full Manaslu Circuit library →Headache with nausea, dizziness, unusual fatigue or poor sleep after gaining altitude may indicate AMS. Worsening symptoms mean no further ascent. Breathlessness at rest, confusion, loss of coordination or inability to walk straight are emergencies requiring immediate descent and professional rescue coordination.
AMS warning signs
- Headache after recent ascent combined with nausea, dizziness, fatigue or disturbed sleep.
- Symptoms that worsen during rest or after moving higher.
- A trekker falling unusually far behind or losing appetite and coordination.
HAPE and HACE emergencies
- Breathlessness at rest, wet cough, blue lips or rapidly declining exercise ability may indicate HAPE.
- Confusion, severe lethargy, irrational behaviour or loss of balance may indicate HACE.
- Both require urgent descent, oxygen where available and medical/rescue coordination.
Evacuation reality
Helicopters depend on weather, visibility, landing conditions, daylight, aircraft availability and insurer authorisation. They are not a guaranteed substitute for descent. The guide should identify the safest immediate descent while support contacts arrange evacuation.
Prevention and communication
- Ascend gradually and retain Samagaun and Samdo acclimatisation time.
- Report symptoms early; never hide them to protect the itinerary.
- Carry insurance wording and assistance numbers offline.
- Agree on daily health checks and emergency responsibilities before departure.
Useful answers
Frequently asked questions
Does water prevent AMS?
Hydration supports normal function but does not prevent altitude illness on its own.
Should I take acetazolamide?
Discuss suitability, dose and contraindications with a qualified clinician before travel.
Can a helicopter always reach Samdo?
No. Weather, terrain, light, landing space and aircraft availability can prevent or delay flight.
Sources and fact-checking
Rules, prices, access, weather and local procedures can change. Reconfirm current conditions before travel.
Keep planning internally
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