Altitude sickness is a real risk on the Manaslu Circuit, mainly from Samagaon (3,530m) up to Larkya La (5,106m). Most trekkers feel mild symptoms such as headache or poor sleep, and they usually ease with rest. The one rule that matters most: if symptoms get worse, you go down.
This guide explains the warning signs and how our itinerary manages the climb. It also covers what happens if someone gets sick in a remote valley. It is general information, not medical advice, so talk to your doctor before you trek.
What’s Inside This Guide
- Where the risk is on the route
- The warning signs
- How our itinerary manages the climb
- How to stay well
- If someone gets sick
- Frequently Asked Questions
- Related Planning Guides
Where the Altitude Risk Is on the Manaslu Circuit
| Section | Overnight altitude | Risk |
|---|---|---|
| Machha Khola to Namrung (Days 1–4) | 930m to 2,630m | Low |
| Lho and Samagaon (Days 5–7) | 3,180m to 3,530m | Moderate; mild symptoms common |
| Samdo (Day 8) | 3,860m | Moderate to high |
| Dharamsala and Larkya La (Days 9–10) | 4,460m, then the pass at 5,106m | High |
| Bimthang onward (Days 10–12) | 3,590m and lower | Falling fast as you descend |
The single biggest step is Day 9, when you sleep 600m higher than the night before, at 4,460m. Then the next morning, you climb to 5,106m.
The Warning Signs of Altitude Sickness
Acute mountain sickness (AMS)
This is the common, milder form. Typical signs are a headache, plus one or more of nausea, tiredness, dizziness or poor sleep. In the mild form, it often settles after a rest day at the same height.
HACE: swelling of the brain
HACE is rare but dangerous. The warning signs are confusion, unusual behaviour, and loss of balance, such as being unable to walk in a straight line. Anyone with these signs must go down at once.
HAPE: fluid on the lungs
HAPE is also rare and serious. Watch for breathlessness at rest, a cough that won’t settle, and a fall in energy that goes beyond normal tiredness. Like HACE, it needs immediate descent.
How Our Itinerary Manages the Climb
The Wilderness Medical Society advises that above 3,000m, you should raise your sleeping height by no more than about 500m a day. It also recommends a rest day every three to four days.
| Night | Sleeping altitude | Gain from the night before |
|---|---|---|
| Lho (Day 5) | 3,180m | +550m |
| Samagaon (Day 6) | 3,530m | +350m |
| Samagaon rest day (Day 7) | 3,530m | None |
| Samdo (Day 8) | 3,860m | +330m |
| Dharamsala (Day 9) | 4,460m | +600m |
To be straight with you, two nights go over that 500m guide: Lho at +550m and Dharamsala at +600m. That is common on this route, because there are few places to sleep in between. We manage it with the rest day at Samagaon, short walking days at Samdo, and close watching by your guide. If you want a wider margin, we can add an extra night at Samdo.
How to Stay Well at Altitude
- Walk slowly. Keep a pace where you can talk easily, especially on the climbs.
- Drink plenty of water. Dry air dehydrates you fast, and dehydration feels a lot like altitude sickness.
- Use the rest day well. Take the gentle climb at Samagaon, then come back down to sleep.
- Tell your guide about every symptom. Even a mild headache is worth mentioning, so they can track how it changes.
- Avoid alcohol up high. It disturbs sleep and can hide early warning signs.
- Talk to your doctor about medication. Some trekkers take acetazolamide (Diamox) to help with acclimatisation. Only a doctor can tell you whether it suits you and how to take it.
If Someone Gets Sick on the Manaslu Circuit
Mild symptoms usually mean resting at the same height until they ease. If symptoms get worse, or any sign of HACE or HAPE appears, the answer is to go down straight away. The Wilderness Medical Society calls descent the single best treatment.
Your guide makes that call, and nobody climbs higher with worsening symptoms. In the upper valley, walking down takes days, so a helicopter is often the fastest way out in a serious case. That is why your travel insurance must cover helicopter evacuation and trekking above 5,000m.
Frequently Asked Questions
Yes, a mild headache at Samagaon is common, since it is the first night above 3,500m. Rest, drink water, and tell your guide. If it eases overnight, you are usually fine to continue.
Only if your symptoms are mild and stable or improving, and your guide agrees. Anyone whose symptoms are getting worse at Dharamsala does not cross. They wait, or they go back down.
No. Fitness helps you cope with long days, but it doesn’t protect you from altitude sickness. Very fit people can get sick if they climb too fast, which is why pace matters more than strength.
Your guide takes you down to a lower village, or arranges a helicopter in a serious case. Extra costs from turning back, such as a helicopter, are not part of the package, so make sure your insurance covers them.
Related Planning Guides
- How Hard Is the Manaslu Circuit? — the hardest days, including the pass
- The 13-Day Manaslu Itinerary — where each night falls
- Manaslu Circuit Distance and Elevation — the full height profile
- Beginners on the Manaslu Circuit — is it right for your first high trek?
- Acclimatisation in Nepal Trekking — how acclimatisation works on any trek
- What the Manaslu Circuit Costs — including the insurance you need
Trek Manaslu Safely With Us
Our 13-day Manaslu Circuit package costs $1,099 to $1,699 per person. It includes the Samagaon rest day and a licensed guide who watches every trekker for altitude symptoms. See the full Manaslu Circuit Trek package → Want an extra night at Samdo? Message us on WhatsApp.
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