Altitude Sickness — What Operators Won't Say in Their Listing

Acute Mountain Sickness affects roughly 25% of people who ascend above 3,500 metres too quickly. On a group trip with a fixed itinerary, you cannot slow down for acclimatisation without being left behind — and most operators do not volunteer this information at the booking stage.

The risk is highest on itineraries that fly or drive to high altitude and begin trekking the same day or the next morning. Manali to Rohtang, Leh by flight, or any trip that jumps 1,500+ metres in 24 hours without a rest day is in this category. Look at the itinerary day by day and flag any single-day elevation gain above 600 metres.

AMS symptoms — headache, nausea, fatigue, dizziness — are easy to dismiss as travel tiredness. The danger is that ignoring them and continuing to ascend risks High Altitude Pulmonary Oedema (HAPE) or High Altitude Cerebral Oedema (HACE), both of which are medical emergencies.

Before booking, ask three specific questions: Does the itinerary include a dedicated acclimatisation day? Does the operator carry supplemental oxygen? What is the protocol if a participant cannot continue — is there a support vehicle and who bears the evacuation cost?

Operators with strong safety cultures will answer these without hesitation. Operators who deflect or say "it's usually fine" are telling you something important about how they handle problems on the ground.

Travel insurance with a high-altitude trekking clause and helicopter evacuation cover is not optional on routes above 4,000 metres. Read the policy exclusion clauses before you buy — many standard policies cap altitude at 3,500 metres.