Upper Mustang Altitude: How to Avoid Altitude Sickness on a Motorbike

Upper Mustang is a high-altitude ride. Lo Manthang sits at about 3,800 m, the passes on the way are around 4,000 m, and the border at Kora La is about 4,660 m. On a motorbike or in a jeep you can gain that height far faster than a trekker would — which is exactly why altitude sickness catches out so many visitors to Mustang. In the year to mid-July 2026, 16 people died of altitude sickness in Mustang district, most of them after travelling quickly from the lowlands.

This guide sets out the altitudes along the route, explains acute mountain sickness (AMS) and its dangerous forms in plain language using guidance from the US Centers for Disease Control and Prevention (CDC) and the Wilderness Medical Society, shows how to plan a safe sleeping profile on a motorbike trip, and covers what altitude does to your bike.

Upper Mustang altitudes along the route

Altitudes vary between maps and sources, sometimes by more than 100 m. Use them as a guide, not as precise values.

For comparison, Everest Base Camp is at about 5,364 m — so Lo Manthang is roughly 1,500 m lower. But what matters for altitude sickness is not the height alone; it is how fast you get there and where you sleep.

What is altitude sickness?

As you go higher, air pressure falls and each breath carries less oxygen. At 3,800 m there is roughly 35–40% less oxygen per breath than at sea level. Your body adapts — breathing faster, making more red blood cells — but this acclimatisation takes days. Altitude illness happens when you go up faster than your body can adjust. It can affect anyone, regardless of age or fitness, and becomes common above about 2,500 m.

Acute mountain sickness (AMS)

The common form. According to the CDC, its main symptom is headache, with one or more of: loss of appetite or nausea, fatigue or weakness, and dizziness. Symptoms usually start 2–12 hours after arriving at a new altitude and, if you stop going up, usually settle within 12–48 hours. It feels like a hangover.

High-altitude cerebral oedema (HACE)

A rare but life-threatening progression of AMS in which the brain swells. Warning signs are confusion, unusual drowsiness and loss of coordination (stumbling, unable to walk in a straight line). It can progress to coma within hours.

High-altitude pulmonary oedema (HAPE)

Fluid in the lungs. It can occur without AMS symptoms first. Warning signs are breathlessness out of proportion to effort, progressing to breathlessness at rest, a cough (sometimes wet or frothy), chest tightness and extreme fatigue.

Checking yourself: the Lake Louise score

Mountain doctors use the 2018 Lake Louise AMS score as a simple self-check. Rate each of four symptoms from 0 (none) to 3 (severe):

A total of 3 or more, including at least 1 point for headache, after a recent gain in altitude indicates AMS: 3–5 is mild, 6–9 moderate and 10–12 severe. Score yourself each morning and evening above 3,000 m, and tell your guide honestly.

Why riders are at higher risk

• Speed of ascent. A bike or jeep can take you from Pokhara at 820 m to Muktinath at 3,700 m in a single long day. The CDC specifically advises against travelling from low altitude to sleep above 2,750 m in one day.
• Less warning. Riding feels much less strenuous than trekking, so riders often dismiss a headache as wind, sun or tiredness.
• Concentration. Even mild AMS slows reaction times and judgement — on a gravel road above a drop, that matters.
• Cold, wind and dehydration. Hours in the Kali Gandaki wind dry you out and chill you; dehydration produces symptoms similar to AMS and makes it harder to tell what is wrong.
• Pressure to keep up. On a group ride or a fixed itinerary, it is tempting to hide symptoms to avoid slowing everyone down. Don’t.

How to acclimatise on a motorbike trip

The CDC and Wilderness Medical Society give consistent guidance, which translates neatly to a motorbike itinerary:

1. Do not go from low altitude to sleep above about 2,750 m in one day. Ride Pokhara–Tatopani on day one, not Pokhara–Jomsom.
2. Above 3,000 m, increase your sleeping altitude by no more than about 500 m a day. Riding higher during the day is fine — it is where you sleep that counts.
3. Add an extra night for every 1,000 m you gain above 3,000 m, without going higher.
4. Climb high, sleep low. Cross the passes during the day and sleep lower at Ghami or Tsarang.
5. Never go higher with symptoms of AMS. Rest at the same altitude until they resolve, or go down.
6. Go down if symptoms worsen or if you suspect HACE or HAPE.

*The Kagbeni–Ghami day is a slightly larger jump than ideal and is why we build in a rest day at Lo Manthang. Some itineraries sleep at Chele or Samar on the way to smooth the profile. Our Upper Mustang motorbike tour follows this approach.

Medication, drink and other tips

• Acetazolamide (Diamox) speeds acclimatisation and is recommended by the CDC for people at moderate or high risk of AMS. It is prescription-only in many countries and has side effects (tingling fingers, frequent urination, fizzy drinks tasting flat). Discuss it with your doctor before you travel.
• Ibuprofen can help with headache and may reduce AMS risk, but less reliably than acetazolamide.
• Painkillers can mask symptoms. If you need them every day, tell your guide.
• Alcohol and sleeping pills: avoid alcohol for the first 48 hours at a new altitude, and avoid sleeping tablets and opioids, which depress breathing at night.
• Hydration: drink enough to keep your urine pale, but do not force large amounts — over-hydration does not prevent AMS and can be dangerous.
• Eat well: carbohydrate-rich meals such as dal bhat help.
• Keep warm: cold increases the strain on your body and can worsen HAPE risk.

Medical help and evacuation in Mustang

The provincial hospital in Jomsom is the only hospital in Mustang district; it treats altitude sickness and runs a seasonal high-altitude post with oxygen near Muktinath temple. Patients from Lo Manthang are taken to Jomsom by ambulance, and serious cases are flown to Pokhara or Kathmandu. Helicopter rescues from Upper Mustang are possible in good weather, but they are expensive and depend on your insurance.

Before you go, make sure your travel insurance explicitly covers motorcycling at your engine size, your maximum altitude (some policies have limits) and helicopter evacuation. Read riding a motorbike in Nepal as a foreigner for more on insurance.

Altitude and your motorbike

Bikes suffer at altitude too. Honda’s own owner’s manuals give a rule of thumb that an engine loses about 3.5% of its power for every 300 m of altitude. That means a bike has lost roughly a third of its sea-level power at Lo Manthang and around 40% at Kora La.

• Fuel-injected bikes (Royal Enfield Himalayan 411 and 450, Honda CRF250L) adjust the fuel mixture automatically and keep running cleanly, but they still lose power.
• Carburettor bikes run rich at altitude, foul plugs and lose even more power unless re-jetted.
• The liquid-cooled Himalayan 450, at about 40 hp at sea level, copes far better on the climbs than the 24 hp Himalayan 411 — see our Himalayan 450 vs 411 comparison.
• Cold mornings make starting harder; let the engine warm up, and keep the battery charged.
• Brakes and clutch work harder on long descents; use engine braking.

Who should be cautious

Anyone can get altitude sickness, but people who have had AMS, HACE or HAPE before, those with heart or lung disease, sickle-cell disease or significant anaemia, pregnant travellers and older visitors with other health conditions should take particular advice. Many of the recent deaths in Mustang were older pilgrims who travelled straight up to Muktinath. If in doubt, choose a lower route — the Nepal Highlights tour stays below about 2,400 m — or build extra nights into a Mustang trip.

Sun, wind and cold at altitude

Upper Mustang’s thin air, strong sun and cold wind add to the strain of altitude. Wear sunglasses and sunscreen, cover up against the wind and take frequent short breaks on long climbs.