Altitude is the single biggest health factor in Tibet, and the good news is that it is very manageable. Here is how acute mountain sickness works, the symptoms to watch for, and a practical plan to acclimatize well.
Altitude, not crime or food, is the real thing to prepare for in Tibet. Lhasa sits at 3,656 metres, and much of the plateau lies above 4,000 metres, where the air holds far less oxygen than at sea level. Almost every visitor feels some effect in their first day or two. The reassuring part is that mild symptoms are normal, usually pass with a sensible plan, and rarely derail a trip. This guide explains what is happening in your body and exactly what to do about it.
This article is general travel information, not medical advice. Talk to your doctor before your trip, especially if you have heart or lung conditions, are pregnant, or take regular medication.
What Altitude Sickness Actually Is
Above roughly 2,500 to 2,700 metres, the lower air pressure means each breath delivers less oxygen. Your body responds by breathing faster and producing more red blood cells, but that adjustment takes time. Acute mountain sickness (AMS) is the mild, common form of altitude illness that results when you ascend faster than your body can adapt. It has nothing to do with fitness; very fit people get it too.
Because flying into Lhasa takes you from low elevation to 3,656 metres in hours, AMS symptoms commonly appear within the first 12 hours and peak on the first or second day.
Common Symptoms
Most travelers experience some of the following soon after arrival:
- Headache, the hallmark symptom
- Fatigue or weakness
- Dizziness or light-headedness
- Shortness of breath on exertion
- Trouble sleeping
- Loss of appetite or mild nausea
These mild symptoms are expected and usually ease over a day or two as you acclimatize. The standard rule is simple: if you have mild symptoms, do not go higher until they improve.
Warning Signs That Need Action
Rarely, AMS can progress to serious conditions affecting the lungs (HAPE) or brain (HACE). These are medical emergencies. Descend and seek help immediately if you or anyone in your group shows:
- A severe headache that painkillers do not touch
- Repeated vomiting
- Breathlessness at rest
- A persistent wet cough, chest tightness, or gurgling breaths
- Confusion, clumsiness, or an unsteady, drunken-looking walk
- Inability to stay awake
Your guide is trained to watch for these signs, and Lhasa has hospitals and evacuation options, which is one practical reason the itinerary starts there.
How to Prevent It: A Practical Plan
1. Acclimatize on arrival
The most important step costs nothing: take it easy for the first 24 to 48 hours. This is why a good Tibet itinerary keeps the first day in Lhasa gentle, with light walking and no high passes. Our 4-day Lhasa Essential tour is deliberately paced this way, and every itinerary we run builds in acclimatization before going higher.
2. Ascend gradually
The general guideline above 2,700 metres is to increase your sleeping altitude by no more than about 500 metres per day and to build in rest. A well-designed route to Everest Base Camp, for example, steps you up in stages rather than racing to elevation. If you can, consider arriving by train, which climbs slowly and gives your body a head start compared with flying. See our train guide.
3. Consider Diamox (acetazolamide)
Acetazolamide, sold as Diamox, is the medication best supported by clinical evidence for preventing AMS and speeding acclimatization. A commonly cited preventive dose is 125 mg twice daily, but dosing and suitability are decisions for your doctor, who can also check for interactions and allergies (it is sulfa-based). Discuss it before you travel and carry it from home.
4. Hydrate and eat lightly
Drink plenty of water; the air is extremely dry and you lose moisture quickly. Favor light, carbohydrate-rich meals while you adjust, and do not overeat.
5. Avoid alcohol, smoking, and sedatives at first
Alcohol and sleeping pills can suppress breathing and mask symptoms. Skip them for the first couple of days. Smoking does you no favors at altitude either.
6. Don't over-exert early
Move slowly, especially on stairs and slopes. Feeling winded walking up a few steps in Lhasa is normal. Pace yourself and let your body lead.
Supplemental Oxygen and Local Remedies
Oxygen is widely available in Tibet, from hotel canisters to the supply system on the Qinghai-Tibet train, and a few breaths can ease a headache. Use it as a short-term comfort measure, not a substitute for proper acclimatization or, when needed, descent. Some travelers also try local remedies such as Rhodiola; evidence is limited, and they are no replacement for the steps above.
Who Should Take Extra Care
People with significant heart or lung disease, uncontrolled high blood pressure, severe anemia, or who are pregnant should get specific medical clearance before traveling to this altitude. If you have had serious altitude illness before, tell us in advance so we can pace your itinerary appropriately.
The Bottom Line
For the large majority of travelers, altitude in Tibet means a headache and some tiredness on day one that fade with rest, water, and a sensible pace. Respect the altitude, build in acclimatization, watch for the warning signs, and you will be free to enjoy one of the most extraordinary landscapes on earth.
Want an itinerary paced for comfortable acclimatization? Browse our Tibet tours, which all start gently in Lhasa, or contact us to tailor the pacing to your needs.
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Häufige Fragen
Most visitors feel some mild effects, such as a headache, tiredness, or shortness of breath, in the first day or two at Lhasa's 3,656 metres. This is normal and usually fades with rest, hydration, and a gentle pace. Serious altitude illness is uncommon when you acclimatize sensibly.
