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Browse the full Annapurna Base Camp library →Acclimatization is the body's gradual adjustment to lower oxygen pressure. A well-paced ABC itinerary uses rest or acclimatization days, modest sleeping-altitude gains and flexible decisions when symptoms appear.
What this means
A common planning principle is to avoid gaining sleeping altitude too quickly above 3,000 m and to add recovery time as elevation rises. Exact limits should be adapted to the person, route and professional advice.
What to do on the trail
- Spend acclimatization days in Ghorepani and Himalaya on a standard itinerary
- Use gentle daytime walks only when the person feels well
- Hydrate normally, eat what is tolerable and avoid alcohol during early acclimatization
- Build a spare day for Nayapul weather and a health-related change of plan
Fitness does not guarantee acclimatization. Never ascend to prove a point, and never hide symptoms to protect a schedule.
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.
Useful answers
Frequently asked questions
Why do trekkers walk high and sleep low?
A short, easy excursion to a higher point followed by sleep at the same lower lodge can provide exposure without adding the full sleeping-altitude gain in one day.
Does training prevent altitude sickness?
Training improves endurance but does not reliably prevent altitude illness. Rate of ascent, sleeping altitude and individual susceptibility remain important.
Sources and fact-checking
Rules, prices, access, weather and local procedures can change. Reconfirm current conditions before travel.
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