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Lhotse (8,516 m): altitude, hazards, oxygen and insurance

2 min readUpdated 2 Nov 2026By the Base Camp Hikes trek team

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

  • How do teams acclimatise before the summit push? They spend April on rotations, climbing through the icefall to Camp 2 and Camp 3 and then returning to rest lower.
  • What are the main dangers on the Lhotse Face? The face is a long, steep slope of hard ice at around 40 to 50 degrees.
  • What medical support is there at base camp? Support typically includes a doctor at base camp, along with Sherpa guides, camp staff and supplemental oxygen.

Do climbers use supplemental oxygen on Lhotse?

Most do. Above 8,000 m the body cannot acclimatise fully, so most climbers use bottled oxygen, along with careful rotations, rest and nutrition. Oxygen does not remove the risk, so your team should explain the system and how to use the mask.

How do teams acclimatise before the summit push?

They spend April on rotations, climbing through the icefall to Camp 2 and Camp 3 and then returning to rest lower. This builds tolerance step by step, and the team then waits for a weather window in mid May before a single summit push.

What are the main dangers on the Lhotse Face?

The face is a long, steep slope of hard ice at around 40 to 50 degrees. Rockfall from above, avalanches, cold, wind and whiteout conditions are the main risks. Climbers move on fixed ropes with jumars and crampons, so rope handling must be second nature.

What medical support is there at base camp?

Support typically includes a doctor at base camp, along with Sherpa guides, camp staff and supplemental oxygen. The level of support depends on the operator, so ask exactly who is on the team, what medical kit they carry and how evacuation is arranged.

What kind of insurance do I need?

You need insurance that covers high altitude mountaineering, including helicopter evacuation, and robust cover is expected of climbers. Check that the policy covers 8,000 m expeditions and the trek in, and carry proof of cover. Operators will often ask for it in advance.

When should a climber turn back?

Turn back if weather deteriorates, you show signs of altitude illness, or your pace puts you at risk on summit day. The round trip from Camp 4 takes 12 to 16 hours, most of it above 8,000 m. Climbers must be comfortable making hard decisions, including turning around.

Why do crowds matter for safety?

In good weather windows many teams move at once, and bottlenecks cause delays. Waiting in the cold at altitude burns oxygen and energy. Good teams plan timing, carry enough oxygen and make decisions early about when to start and when to turn back.

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