Free safety tool

Altitude sickness self-check

Rate five symptoms using the Lake Louise score to gauge whether you might have acute mountain sickness — and see exactly what to do next. Educational only, never a substitute for descending or getting help.

This is an educational self-check based on the Lake Louise AMS score — not a medical diagnosis. When in doubt, stop ascending and descend. If anyone shows severe symptoms, treat it as an emergency.

Headache

Gastrointestinal symptoms

Fatigue / weakness

Dizziness / lightheadedness

Emergency warning signs — tick any that apply

Can't walk heel-to-toe in a straight line (loss of coordination)Breathless or coughing even while restingConfusion, drowsiness or behaving strangelyBlue/grey lips or fingernails, or coughing pink/frothy spit

TrekGuard runs this exact self-check offline at altitude, reminds you to re-check as you climb, and pairs it with your live altitude and SOS tools — so you catch AMS early when it matters.

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