Why trust this guide?
Each guide keeps the answer near the top, separates stable facts from changing operational details, names its author and reviewer, and links to responsible sources.
Meet the team and review standard →Altitude safety depends on the pace, sleeping-altitude profile and honest symptom reporting; fitness alone does not prevent altitude illness.
Safety decision aid
Stop, descend and seek help when symptoms worsen
Online guidance cannot diagnose illness. Tell your guide early and seek professional medical advice whenever symptoms are concerning.
- StopPause the ascent and assess with your guide.
- DescendGo lower if symptoms do not settle or are severe.
- EvacuateUse medical care, rescue coordination and insurance support when needed.
What this means
AMS is a pattern of symptoms after recent ascent; a guide or clinician should consider other causes such as dehydration, infection, exhaustion, migraine or medication effects.
What to do on the trail
- Headache after ascent, especially with nausea or dizziness
- Unusual fatigue, reduced appetite or disturbed sleep
- Poor balance, confusion, breathlessness at rest or a wet cough are red flags for more serious illness
- Never use a normal-looking pulse-oximeter reading to dismiss a worsening clinical picture
Do not ascend with worsening symptoms. Stop, tell the guide, rest at the same altitude or descend according to professional advice.
Build it into the itinerary
Share the plan with every trek member before departure. Agree who makes the decision to stop or descend, where the nearest help is expected and how the operator and insurer will be contacted.
Current weather, transport, local medical access and trail conditions can change. Reconfirm the operational plan in Kathmandu and again with the guide before the high stages.
Important planning links
Build the complete trek plan
Useful answers
Frequently asked questions
Can I continue if I have a mild headache?
Do not decide from headache alone. Stop ascending, report it, check for other symptoms and follow the guide or clinician's assessment. Symptoms that worsen require descent and professional help.
Is AMS the same as dehydration?
No. Dehydration, exhaustion and other illnesses can look similar. A health professional should assess the overall pattern rather than relying on one symptom.
Sources and fact-checking
Changing prices, fees, aviation arrangements, local procedures, weather and lodge availability should be reconfirmed before travel. Altitudes, distances and walking times are approximate planning values.
Supports: high-altitude illness prevention, recognition and descent-oriented safety guidance. Period: current guidance. Accessed: August 7, 2026.
Supports: acclimatization principles and emergency altitude-illness context. Period: current travel-health guidance. Accessed: August 7, 2026.
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