The single biggest risk on high-altitude treks isn't the terrain — it's ignoring your body.
Altitude sickness — also called Acute Mountain Sickness (AMS) — affects roughly 50% of trekkers who ascend above 3,500m too quickly. It doesn't discriminate: fitness level, age, and prior experience are poor predictors. The fittest person in your group can be the first to get sick.
Symptoms to Watch For
AMS typically begins 6–12 hours after arriving at a new altitude. Mild symptoms include:
- Headache (the most common early sign)
- Nausea and loss of appetite
- Dizziness and fatigue
- Difficulty sleeping
Severe symptoms that require immediate descent:
- Confusion or disorientation
- Loss of coordination (ataxia)
- Persistent vomiting
- Gurgling sound in the chest (fluid in the lungs)
The Golden Rules of Acclimatization
- Climb high, sleep low: Make acclimatization hikes above your sleeping altitude, then return to camp.
- Ascend gradually: Above 3,000m, don't increase your sleeping altitude by more than 300–500m per day.
- Stay hydrated: Drink 3–4 liters per day. Dehydration mimics and worsens AMS symptoms.
- Listen to your body: If you feel unwell, don't ascend. If symptoms worsen, descend immediately.
Diamox: Should You Take It?
Acetazolamide (Diamox) is a prescription medication that speeds acclimatization. Many trekkers use it prophylactically (125mg twice daily starting 24 hours before ascent). It's not a magic bullet — you still need proper acclimatization — but it can help. Consult your doctor before your trek.
Our guides carry pulse oximeters and perform twice-daily health checks above 3,500m. Your safety is always our priority.