Guide checking a Nepal trek route decision at high altitude
Nepal Travel / What To Do

What to Do If You Get Altitude Sickness in Nepal

If you feel unwell after ascending in Nepal, do not hide symptoms and do not continue upward by default. Stop, tell your guide, reassess, and descend if symptoms worsen or severe warning signs appear.

Altitude response is a route decision: symptoms should change the plan before they become an emergency.

Direct answer

The first step is to stop ascending and tell the guide. Mild symptoms may improve with rest at the same altitude, but worsening symptoms, confusion, poor coordination, breathlessness at rest, chest symptoms, or inability to walk normally should be treated as urgent and may require descent, oxygen, medical care, or evacuation.
  • Do not climb higher with unresolved symptoms.
  • Do not separate from the group to push on alone.
  • Do not rely on handheld oxygen cans as an emergency plan.
  • Use descent and professional medical support when serious symptoms appear.

Mild vs serious warning signs

Mild AMS often feels like a headache with nausea, appetite loss, dizziness, fatigue, or poor sleep after ascent. Serious red flags include confusion, ataxia, severe drowsiness, breathlessness at rest, worsening cough, blue lips, or collapse.

Guide and evacuation decisions

A good guide should prioritize symptoms over itinerary pride. If descent on foot is not safe or fast enough, the operator should activate the emergency plan through local rescue, medical, and insurance channels.

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Frequently asked questions

Can I keep trekking if I have a headache at altitude?

Do not ascend while symptoms are unresolved. A headache after ascent can have many causes, but at altitude it should be treated cautiously until it improves and the guide is satisfied it is safe.

When is descent necessary?

Descent is necessary when symptoms worsen, severe symptoms appear, or the guide/clinician decides the current altitude is unsafe. Serious neurological or breathing signs need urgent action.

Does helicopter rescue replace good acclimatization?

No. Rescue is a backup for emergencies, not a planning shortcut. The goal is to prevent emergencies through pacing, symptom reporting, and conservative decisions.

Sources and official references

We use official and primary sources where possible. Travel rules, access, and operating conditions can change, so confirm requirements before departure.

Nepal tourist search, rescue, treatment, and monitoring procedure

Government tourism procedure reference for tourist rescue, treatment, and monitoring processes.

Last checked May 6, 2026

Civil Aviation Authority of Nepal

Official civil aviation authority reference for Nepal aviation oversight and operational context.

Last checked May 6, 2026

CDC Yellow Book high-altitude travel and altitude illness

CDC Yellow Book 2026 medical reference for acclimatization, altitude illness risk, symptoms, treatment principles, and medication context.

Last checked May 6, 2026

CDC Nepal traveler health

CDC country-specific traveler-health reference for Nepal pre-travel preparation.

Last checked May 6, 2026

Trusted By

Government of NepalNepal Tourism BoardNepal Mountaineering AssociationTrekking Agencies Association of NepalKEEP NepalTrustpilot