How to Prevent Acute Mountain Sickness (AMS) on High Passes
By Dr. Meera Iyer (Wilderness Medical Advisor)
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August 14, 2026
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7 min read
## Understanding Altitude Sickness
As you climb above 8,000 ft (2,500 m), atmospheric pressure decreases, meaning every breath draws fewer oxygen molecules into your bloodstream. Your body adapts by breathing faster, producing more red blood cells, and adjusting blood pH.
### The Golden Rules of Altitude Safety
1. **Climb High, Sleep Low**: Push your elevation during daytime walks and descend slightly to camp.
2. **Hydration**: Drink 4 to 5 liters of water daily. Clear urine is your best indicator of good hydration.
3. **Pacing**: Walk at a conversational rhythm. Do not rush out of camp.
4. **Never Ignore Symptoms**: A mild headache, nausea, or loss of appetite must be reported immediately to your trek leader.
At Peak Adventures, every camp has pulse oximeters and oxygen cylinders ready for instant response.
As you climb above 8,000 ft (2,500 m), atmospheric pressure decreases, meaning every breath draws fewer oxygen molecules into your bloodstream. Your body adapts by breathing faster, producing more red blood cells, and adjusting blood pH.
### The Golden Rules of Altitude Safety
1. **Climb High, Sleep Low**: Push your elevation during daytime walks and descend slightly to camp.
2. **Hydration**: Drink 4 to 5 liters of water daily. Clear urine is your best indicator of good hydration.
3. **Pacing**: Walk at a conversational rhythm. Do not rush out of camp.
4. **Never Ignore Symptoms**: A mild headache, nausea, or loss of appetite must be reported immediately to your trek leader.
At Peak Adventures, every camp has pulse oximeters and oxygen cylinders ready for instant response.
D
Dr. Meera Iyer (Wilderness Medical Advisor)
Mountain Content Specialist & High-Altitude Trek Leader at Mountain Guide.