How to Prevent Altitude Sickness on Mount Rinjani

Standing at a towering 3,726 meters (12,224 feet) above sea level, Mount Rinjani is Indonesia's second-highest active volcano. While the views from the top are arguably the best in Southeast Asia, the altitude is no joke. Acute Mountain Sickness (AMS), commonly known as altitude sickness, is a real risk for any trekker.

At Rinjani Trekking Pro, your safety is our ultimate priority. We have successfully guided thousands of hikers to the summit safely. Here is our expert guide on understanding, preventing, and managing altitude sickness on Rinjani.

What is Altitude Sickness (AMS)?

AMS occurs when your body cannot acclimatize quickly enough to the lower oxygen levels and decreased air pressure at high altitudes. On Rinjani, symptoms typically start appearing once you cross the 2,500-meter mark (around the Crater Rim).

Common symptoms include:

• Mild to severe headaches (throbbing sensation)
• Nausea, vomiting, or loss of appetite
• Dizziness and fatigue
• Shortness of breath, even when resting
• Difficulty sleeping at the campsite

5 Golden Rules to Prevent AMS on Rinjani

1. "Pole-Pole" (Go Slowly)

The Swahili phrase "Pole-Pole" (slowly) from Kilimanjaro applies perfectly here. Do not rush. Trekking is not a race. Walking at a slow, steady, and rhythmic pace allows your lungs to adapt to the thinning air. Our guides will actively manage your pace to ensure you don't overexert yourself.

2. Hydration is Key

Dehydration masks itself as altitude sickness. You lose a lot of water through sweat and heavy breathing in dry mountain air. You must drink at least 3 to 4 liters of water a day. Our porters carry ample safe drinking water, so keep sipping continuously throughout the hike.

3. Climb High, Sleep Low

This is a core principle of mountaineering. The 3D2N and 4D3N packages naturally incorporate this. You will hike up to the Crater Rim (2,639m), rest, and then optionally descend to the Lake (2,000m) on the second day. This natural fluctuation drastically helps your body acclimatize.

4. Eat Carbs, Avoid Alcohol

Your body needs an immense amount of energy to operate at high altitudes. Eat a carbohydrate-rich diet (our camp chefs prepare amazing pasta, rice, and potato dishes!). Strictly avoid alcohol and smoking during the trek, as they suppress breathing and worsen dehydration.

5. Consider Medication (Consult Your Doctor)

Some trekkers bring Diamox (Acetazolamide) to speed up acclimatization. If you know you are prone to AMS, consult your physician back home before flying to Indonesia to get a prescription.