Health & Preparedness
Altitude Sickness, Symptoms & Prevention
The mountains of Bhutan inspire awe — but they also demand respect. Understanding altitude and its effects on your body is an essential part of preparing for an extraordinary journey.
What Is Altitude Sickness?
Altitude sickness — also known as Acute Mountain Sickness (AMS) — occurs when the body does not have enough time to adapt to the lower air pressure and reduced oxygen levels found at higher elevations. It can affect anyone, regardless of age, fitness, or previous high-altitude experience. There is no way to predict who will be affected; a marathon runner may struggle while a casual walker adapts effortlessly. The key is awareness, preparation, and listening to your body.
AMS typically begins to affect travelers above 2,500 meters (8,200 ft). Since Paro International Airport sits at 2,250 meters, most visitors to Bhutan are already near the threshold upon arrival — though the vast majority experience no symptoms at all during standard cultural tours.
Recognizing the Symptoms
The symptoms of AMS typically appear 6 to 24 hours after reaching a higher elevation. They range from mild to severe:
Mild AMS — headache, mild nausea, fatigue, dizziness, difficulty sleeping, loss of appetite, and slight breathlessness during exertion. These symptoms are common and usually resolve within 24–48 hours as your body acclimatizes.
Moderate AMS — persistent severe headache (not relieved by medication), increasing nausea or vomiting, extreme fatigue, shortness of breath even at rest, and decreased coordination. If these symptoms appear, do not ascend further. Rest, hydrate, and consider descending.
Severe AMS (Medical Emergency) — confusion, inability to walk in a straight line, persistent vomiting, and fluid in the lungs (HAPE) or brain (HACE). These conditions are rare but life-threatening. Immediate descent and medical attention are essential.
Prevention — The Golden Rules
1. Ascend gradually. The most effective prevention is simple: climb high, sleep low. Allow your body time to adjust by limiting altitude gain to 300–500 meters per day above 3,000 meters. Our trekking itineraries are specifically designed with acclimatization days built into the schedule.
2. Stay hydrated. Drink at least 3–4 liters of water per day at altitude. Dehydration mimics and worsens AMS symptoms. Avoid alcohol during the first 48 hours at a new elevation.
3. Eat well. High-carbohydrate meals give your body the fuel it needs to generate energy in low-oxygen conditions. Eat regularly, even if your appetite is reduced.
4. Rest on arrival. Resist the temptation to rush into activities on your first day. Allow at least one full day for acclimatization before strenuous hikes or high-altitude passes.
5. Consider medication. Acetazolamide (Diamox) is commonly prescribed as a preventive measure for altitude sickness. Consult your doctor before travel to discuss whether it is appropriate for you. Begin taking it 24 hours before ascent as directed.
6. Listen to your body. If you feel unwell, tell your guide immediately. There is no shame in slowing down, resting, or descending. In the mountains, wisdom is knowing your limits.
How Pelyab Tours Keeps You Safe
Every Pelyab Tours guide is trained in altitude sickness recognition and first-aid response. Our trekking itineraries include built-in acclimatization days, and we carry first-aid kits with emergency oxygen on all high-altitude treks. We monitor each traveler daily and adjust the pace and itinerary as needed. Your safety and comfort are never compromised — because the most beautiful mountain in the world means nothing if you are not well enough to see it.
The mountains will wait for you.
There is no summit worth reaching at the cost of your well-being.