The situation
Lobuche, 4,940 m, day seven. Base Camp was a single day away. The group was fit, the weather was settled, and everybody had walked well for a week. On paper it was a straightforward finish.
One trekker had a headache that had not shifted since Dingboche. Not dramatic — no vomiting, no confusion, still eating, still joking at dinner. But two paracetamol were not touching it, and the overnight oximeter reading had drifted down three days running rather than recovering the way it should.
What the numbers were doing
A single oxygen saturation reading tells you very little at altitude. Everybody's drops. What matters is the trend, and whether it recovers overnight — because acclimatisation is a process that happens while you sleep.
Theirs was not recovering. Combined with a headache that had outlasted two nights and a lost appetite, that is a pattern rather than a bad day. The textbook line is simple: do not ascend with symptoms of altitude sickness. Not "go slower". Do not ascend.
Nobody felt ill enough to want to stop. That is exactly why the decision has to sit with someone whose judgement is not clouded by having flown across the world for this. Wanting it badly is not a symptom you can measure — but it is the one that gets people into trouble.
What we did
The trekker went down to Pheriche with a guide — about 600 metres of descent, two and a half hours. The headache broke that evening. It always does; descent is the only treatment that fixes the cause rather than the symptoms.
The rest of the group carried on to Gorak Shep and Base Camp the next morning, then came down and met them. Nobody was abandoned, nobody was left in a lodge alone, and nobody paid extra for it. That contingency is built into how we staff a trip.
Why we write this down
It is not an easy story to publish. "We did not reach Base Camp" is a strange thing to put on a trekking website.
But the alternative is worse. Every season, people are pushed higher because a schedule is fixed, or because a group does not want to be the reason someone turns round, or because an operator quietly prices the risk into the itinerary. The Himalayan Rescue Association posts at Pheriche and Manang exist because of it.
So: the schedule is not fixed. If your body says no, the trip changes, and it costs you nothing. If you would rather book with someone who promises you will summit regardless — we are genuinely the wrong company.
They came back the following autumn, by the way. Walked to Base Camp in clear weather and slept fine at Gorak Shep.
