Altitude Sickness: A Practical Guide for Himalayan Trips

What it feels like

Mild symptoms include headache, nausea, dizziness and trouble sleeping. They usually appear within hours of arriving at a higher altitude. If symptoms are severe or worsen, descend and seek medical help.

How to lower the risk

Ascend gradually and allow a rest day at the first high stop. Drink plenty of water, avoid heavy alcohol and take it easy on arrival.

• Talk to your doctor before the trip, especially if you have heart, lung or blood-pressure conditions.
• Do not push on if you feel unwell; the mountains will still be there.
• Choose itineraries with proper acclimatisation days built in.

Know your plan

Know where the nearest medical facility is, carry a basic first-aid kit and share your route with your tour operator.