Thorong La health and safety: altitude, cold, knees and storm lessons

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

• Which symptoms mean I should not climb from Phedi? Any headache or poor sleep is a reason to stay at Phedi rather than push on to High Camp.
• How cold does it get on pass day? Temperatures at dawn are far below freezing, and wind picks up as the sun rises.
• How can I cope with the thin air on the pass? Walk slowly in a steady rhythm and breathe deeply.

Which symptoms mean I should not climb from Phedi?

Any headache or poor sleep is a reason to stay at Phedi rather than push on to High Camp. Nausea, dizziness, unsteadiness or breathlessness at rest mean you should not go higher and should descend. Tell your guide early, not at the pass.

How cold does it get on pass day?

Temperatures at dawn are far below freezing, and wind picks up as the sun rises. Lodge rooms can also be below freezing. Wear a base layer, fleece, down jacket and windproof shell, with a warm hat and gloves, and keep spare layers in your daypack.

How can I cope with the thin air on the pass?

Walk slowly in a steady rhythm and breathe deeply. On steeper sections, use rest-steps, pausing briefly with each step to catch your breath. Avoid long stops in the cold, drink regularly and tell your guide if you feel worse.

What should I do about knee pain and blisters on the descent?

Use poles, take short steps and bend your knees. Tape known hot spots before you start, and stop to treat blisters early. Rest in the sun when you can, and drink even if you do not feel thirsty.

What does a good guide do about weather on the pass?

A good guide checks weather and snow, speaks to other guides, sets a turn-around time, keeps the group together and makes the call to wait. Choose an operator that treats these decisions as non-negotiable, and agree on that before the trip starts.

How can I lower weather risk on pass day?

Do not cross after heavy snow, check forecasts but trust local advice too, and do not go late in the morning. Do not push on in bad weather because of a schedule. Carry warm clothing and food even for a day crossing.

How should I handle altitude on the afternoon before the pass?

Rest and eat before walking up to High Camp, drink plenty and go slowly. Avoid alcohol at either site. Pack your bag the night before and set out your clothing, so the morning is calm.