Annapurna Circuit health and safety: altitude, Thorong La and weather

The short version: three of the most asked questions, answered in a line each. The rest of the page goes into detail.

• How much sleeping altitude can I gain per night? Above 3,000 m, try to limit the gain in sleeping altitude to roughly 300 to 500 m per night, and add a rest day for about every 1,000 m.
• What is a climb high, sleep low hike near Manang? It means walking to a higher viewpoint during the day and returning to sleep at Manang, about 3,540 m.
• Which symptoms mean I should not go higher? A headache that does not ease with rest and water, nausea or vomiting, unusual breathlessness at rest, poor coordination or confusion all mean you should stop climbing.

How much sleeping altitude can I gain per night?

Above 3,000 m, try to limit the gain in sleeping altitude to roughly 300 to 500 m per night, and add a rest day for about every 1,000 m. This is general guidance, not medical advice. It is slower than many groups walk, which is why so many people get into trouble.

What is a climb high, sleep low hike near Manang?

It means walking to a higher viewpoint during the day and returning to sleep at Manang, about 3,540 m. Good choices include the Gangapurna lake viewpoint or higher routes toward Ice Lake or Praken Gompa. Go only if you feel well, and keep the pace gentle.

Which symptoms mean I should not go higher?

A headache that does not ease with rest and water, nausea or vomiting, unusual breathlessness at rest, poor coordination or confusion all mean you should stop climbing. Tell your guide at once. If symptoms worsen, descend to a lower village instead of waiting to see whether you improve overnight.

What should my travel insurance cover for Thorong La?

Check that your policy covers trekking to at least 5,500 m, which comfortably includes Thorong La at about 5,416 m, and that it includes helicopter evacuation. Read the small print on guided versus independent trekking, and carry the policy number and emergency contact where your guide can find them.

Is it safe to cross Thorong La on my own?

It is risky. The trail is well used, but the dangers are altitude, weather and being alone if you fall ill. Never cross in poor visibility or after fresh snow. A guide or at least a partner can spot symptoms early, so most people are safer with company on pass day.

What weather risks should I expect at the pass?

Heavy snow and strong wind can close Thorong La in winter, and snow may linger in March. Mornings are usually calmer, so start early and treat pass day as a go or no-go decision. Be ready to wait at your lodge for a better day, because rushing is the bigger risk.

How much should I drink and what about water safety?

Drink steadily through the day and eat even when your appetite is low, since dehydration worsens altitude symptoms. Use boiled or treated water rather than buying plastic bottles where you can. Carry purification tablets or a filter, and avoid untreated stream water, especially below the villages.