Acclimatization: Conquering Altitude Sickness

Understanding Altitude Sickness

Altitude sickness affects 20-50% of trekkers above 8000ft. Understanding prevention prevents suffering.

Altitude Sickness Types

Acute Mountain Sickness (AMS)

Most Common Form

Symptoms (appear 12-24 hours after ascent):

• Headache (universal)
• Nausea or loss of appetite
• Fatigue & lethargy
• Sleep disturbances
• Mild shortness of breath

Risk Factors:

• Rapid ascent (>3000ft per day)
• Inadequate acclimatization
• Overexertion first days
• Individual susceptibility
• Poor hydration

High Altitude Cerebral Edema (HACE)

Severe, Rare - Medical Emergency

Symptoms:

• Severe headache unrelieved by medication
• Confusion & irrational behavior
• Loss of coordination
• Altered consciousness
• Requires immediate descent

High Altitude Pulmonary Edema (HAPE)

Severe, Rare - Medical Emergency

Symptoms:

• Severe shortness of breath at rest
• Chest tightness & pain
• Pink/frothy sputum
• Requires immediate descent & evacuation

Prevention Strategies

Acclimatization Schedule

Best Approach: Ascend 1000-1500ft per day above 8000ft

Our Trek Structure:

• Dzongri Trek: Gradual 2-day ascent to 10000ft, 1 rest day
• Goechala Trek: 3-day approach, rest at 10000ft, then summit push
• Sandakphu Trek: 2 days approach, rest at 11000ft

Hydration Protocol

• Drink 3-4L water daily
• Drink before thirst appears
• Avoid caffeine (dehydrating)
• Minimize alcohol completely
• Herbal tea (ginger, turmeric)

Nutrition Strategy

• Eat more carbohydrates (60% of diet)
• Frequent small meals (6-8 daily)
• High-calorie snacks between meals
• Iron-rich foods for oxygen carrying
• Avoid heavy, greasy foods initially

Sleep & Rest

• Acclimatization happens while sleeping
• Early bed time (altitude sleepiness)
• Sleep often disturbed (normal)
• Rest days are critical
• "Climb high, sleep low" principle

Activity Management

• Take slow acclimatization hikes
• Day hikes above camp, return to sleep
• Easy pace first 2-3 days
• Gradual exertion increases
• Listen to body signals

Medications for Altitude Sickness

Acetazolamide (Diamox)

• Prescription medication
• Dosage: 250mg twice daily
• Start: 1-2 days before high altitude
• Effect: Speeds acclimatization 25-30%
• Side effects: Tingling fingers/toes, altered taste
• Not a cure: Still need proper acclimatization

Ibuprofen

• For altitude headache relief
• Standard doses: 400-600mg
• Not preventative, symptomatic relief
• Combine with rest

Ginger & Herbal Supplements

• Ginger tea aids nausea
• Turmeric for inflammation
• Herbal support, not primary
• Consultation with doctor first

Daily Acclimatization Routine

Morning Routine (Altitude Camp)

• Hydrate immediately upon waking
• Light breakfast (carbohydrates)
• Check in with self: symptoms?
• Take Diamox if prescribed

Daytime

• Acclimatization hike (30-45 min)
• Return to camp for lunch
• Rest/journal/photography
• Hydrate consistently
• Light afternoon walk if feeling good

Evening

• Dinner (substantial but not heavy)
• Hydrate before bed
• Sleep preparations
• Monitor sleep quality

Recognizing Symptoms

When to Report Symptoms

• Any new symptoms at altitude
• Persistent headache (>2 hours)
• Nausea affecting eating
• Undue fatigue
• Sleep disturbances

Tell guide immediately. Early intervention prevents progression.

Symptom Severity Assessment

Mild (Normal for Altitude):

• Slight headache
• Minor nausea
• Mild shortness of breath
• Manageable with rest/medication

Moderate (Attention Required):

• Persistent headache despite medication
• Nausea affecting eating
• Significant shortness of breath
• Confusion or disorientation
• Action: Rest day, hydrate, monitor closely

Severe (Descend Immediately):

• Extreme headache
• Confusion
• Difficulty walking
• Altered consciousness
• Action: Descend minimum 1000ft immediately

Descent Guidelines

When to Descend

• Any symptoms of HACE or HAPE
• Moderate AMS not improving in 24 hours
• Severe symptoms at any time
• Personal physical limits reached

Descent Impact

• Symptoms improve within hours of descent
• Physical recovery takes 24-48 hours
• Mental recovery important
• Option to re-attempt trek after recovery

Individual Variation

Factors Affecting Susceptibility:

• Age: Younger more susceptible (contrary to myth)
• Fitness: Fitness level doesn't prevent AMS
• Gender: Women slightly more affected
• Prior experience: Some acclimatization benefit
• Genetics: Some people very resistant

Prediction is Difficult:

• First time at altitude can't predict future
• Previous success doesn't guarantee future success
• Listen to body, not ego

Post-Trek Recovery

• First day post-trek: Rest & hydration
• Sleep returns to normal quickly
• Headache resolves within 24 hours
• Energy recovers in 2-3 days
• Lingering effects are normal

Mental Aspects of Altitude

Psychological Effects

• Mood fluctuations common
• Depression possible at extreme altitude
• Motivation affected
• Emotional regulation changes

Mindset Strategies

• Prepare mentally before trek
• Expect some discomfort
• Focus on present moment
• Group support crucial
• Guides trained in encouragement

Last updated: April 2026