Your Altitude Sickness Strategy
Plan to ascend gradually: spend at least two to three days above 2,500 meters before going higher, stay well hydrated, avoid alcohol, and consider prophylactic medication after a doctor’s approval. If you develop symptoms, rest and descend if they worsen. This approach works for most travelers and turns a potentially risky trip into an enjoyable one.
What Altitude Sickness Is and Common Symptoms
Altitude sickness, or Acute Mountain Sickness (AMS), results from the body’s struggle to adapt to lower oxygen levels. Symptoms typically start 6 to 12 hours after arrival and include headache, nausea, fatigue, dizziness, and loss of appetite. Mild AMS is common and usually resolves with rest and hydration.
More severe forms are rare but serious: High-Altitude Cerebral Edema (HACE) causes confusion, loss of coordination, and altered consciousness. High-Altitude Pulmonary Edema (HAPE) brings extreme breathlessness, coughing up pink froth, and blue lips or fingernails. Both require immediate descent and medical attention. Know these red flags before you go.
Pre-Trip Preparation
Consult your doctor 4 to 6 weeks before departure. Discuss your itinerary, any pre-existing conditions (heart or lung issues increase risk), and the suitability of prophylactic medication.
Medication: Acetazolamide (brand name Diamox) is the standard preventive drug. It requires a prescription. You can obtain it from your home doctor or, in China, from a hospital or clinic (the drug is called 乙酰唑胺 in Chinese). Bring your own supply with a doctor’s note. Also pack ibuprofen or acetaminophen for headache, and anti-nausea tablets like dimenhydrinate. Do not rely on traditional remedies—no evidence supports their effectiveness.
Travel insurance: Standard plans often exclude high-altitude evacuation. Read your policy carefully and buy additional cover if you plan to go above 3,000 meters. Confirm the insurer will arrange helicopter rescue or clinic transport in remote areas.
Check altitudes: Look up official figures from local tourism boards or government sources for your specific destinations. Altitudes can vary by several hundred meters depending on the exact trail or accommodation. The table below gives approximate values.
On-Trip Acclimatization Plan
Gradual ascent: The golden rule is “climb high, sleep low.” Increase your sleeping altitude by no more than 300–500 meters per day once you are above 3,000 meters. If you drive from a low city to a high plateau, break the journey with an intermediate stop.
Rest days: For every 1,000 meters gained above 3,000 meters, schedule a full day of light activity at that altitude before going higher. Use rest days for short walks, not strenuous hikes.
Hydration and diet: Drink 3 to 4 liters of water per day until your urine is pale. Carry electrolyte packets. Eat high-carb, low-fat meals and avoid salty foods to reduce fluid retention.
Avoid: Alcohol, sleeping pills, and heavy exercise on arrival. Alcohol worsens dehydration and suppresses breathing. Sleeping pills can blunt the natural increase in breathing rate that helps you acclimatize.
Medications Available in China
| Medication | Type | How to Access |
|---|---|---|
| Acetazolamide (Diamox, 乙酰唑胺) | Prescription | Bring from home with a note, or obtain at a Chinese hospital/clinic |
| Dexamethasone (地塞米松) | Prescription | For severe AMS only; required from a doctor |
| Ibuprofen / Acetaminophen | Over the counter | Available at any pharmacy (药店); ask for 布洛芬 or 对乙酰氨基酚 |
| Dimenhydrinate (晕海宁) | Over the counter | For nausea; widely available |
Do not self-prescribe dexamethasone. It is a potent steroid used only in emergencies under medical supervision.
Recognizing Severe Symptoms and Emergency Steps
Red flags that require immediate descent:
- Confusion or irrational behavior
- Inability to walk in a straight line (ataxia)
- Blue lips or fingernails
- Coughing up pink, frothy sputum
- Extreme shortness of breath even at rest
Action: Descend to the highest point you last felt well, ideally below 2,500 meters. If immediate descent is impossible, use a portable hyperbaric chamber (Gamow bag) if available, and administer oxygen. Alert your hotel, tour guide, or fellow travelers. In remote areas, a satellite phone or personal locator beacon can be lifesaving.
Local resources: At popular destinations such as Shangri-La, Daocheng, and Litang, there are small clinics and county hospitals. Ask your guesthouse staff for directions. Note emergency numbers: 120 for ambulance, but response times may be long in rural areas.
Example Altitudes of Popular Destinations
| Destination | Approximate Altitude | Notes |
|---|---|---|
| Qinghai Lake | 3,200 m | Verify current official data |
| Tiger Leaping Gorge (trek) | 1,800–2,600 m | Lower sections safe; highest point ~2,600 m |
| Shangri-La (Zhongdian) | 3,300 m | Common acclimatization stop |
| Litang, Sichuan | 4,000 m | One of the highest towns; rest carefully |
| Daocheng Yading | 3,700–4,700 m | Highest trekking point; multiple days needed |
Always confirm altitudes with local tourism offices or official sources before travel.
Quick Checklist for Travelers
- Consult doctor 4–6 weeks before departure
- Obtain prescription for acetazolamide if needed
- Pack ibuprofen, acetaminophen, and anti-nausea medication
- Buy travel insurance covering high-altitude evacuation
- Plan a gradual itinerary with rest days above 3,000 m
- Bring a large water bottle and electrolyte powder
- Note the location of the nearest clinic or hospital
- Carry a printed emergency contact card in Chinese
Frequently Asked Questions
Can I use acetazolamide if I am allergic to sulfa drugs? Acetazolamide is a sulfonamide. If you have a sulfa allergy, consult your doctor before taking it. Alternatives may be available, but no prophylactic medication is risk-free. Your doctor will assess the balance of benefit and risk.
How long does it typically take to acclimatize at 4,000 meters? Most people need 2 to 4 days at 4,000 meters to feel reasonably comfortable. Full acclimatization takes longer, but you can continue to higher altitudes after that window. Listen to your body and plan extra rest if symptoms persist.
Is it safe to fly directly to Lhasa from sea level? Flying to Lhasa (3,650 m) from sea level is common, but it increases the risk of altitude sickness because there is no gradual ascent. The same principle applies to any high-altitude airport. If your trip includes a direct flight to a high plateau, plan for at least two days of very light activity after arrival and consider starting acetazolamide the day before. For destinations like Lhasa, these precautions are especially important.