Kilimanjaro Altitude Sickness: A Complete Prevention Guide

**What Is Altitude Sickness?** Altitude sickness occurs when you ascend to elevation faster than your body can adapt. As altitude increases, air pressure drops, meaning less oxygen is available with each breath. Your body compensates by breathing faster and deeper, but this takes time. **Oxygen Levels at Kilimanjaro Altitudes:** - Sea level: 100% oxygen availability - Moshi/Arusha (900m): ~90% - Forest zone (2,800m): ~75% - Barafu Camp (4,673m): ~55% - Uhuru Peak (5,895m): ~50% By summit day, you're breathing air with roughly half the oxygen of sea level. **Three Forms of Altitude Illness:** 1. **Acute Mountain Sickness (AMS):** Mild form affecting 40%+ of trekkers above 3,000m 2. **High Altitude Pulmonary Edema (HAPE):** Fluid in lungs—life threatening 3. **High Altitude Cerebral Edema (HACE):** Brain swelling—life threatening Both HAPE and HACE are rare on Kilimanjaro with proper acclimatization, but AMS is common.

**Mild AMS Symptoms (Common and Manageable):** - Headache (most common symptom) - Nausea or loss of appetite - Dizziness or lightheadedness - Fatigue and weakness - Difficulty sleeping - Shortness of breath on exertion **Moderate AMS (Action Required):** - Severe headache unrelieved by medication - Nausea with vomiting - Weakness affecting walking - Decreased coordination - Persistent shortness of breath at rest **Severe AMS / HAPE / HACE (Immediate Descent Required):** - Shortness of breath at rest (HAPE indicator) - Persistent cough, possibly producing frothy sputum - Confusion, altered mental state (HACE indicator) - Inability to walk in straight line - Loss of consciousness **Our Daily Monitoring:** Our guides check every climber every morning using: - Pulse oximeter (measures blood oxygen saturation) - Lake Louise symptom questionnaire - Observation of walking and coordination - Discussion of sleep quality and symptoms Normal oxygen saturation on the mountain ranges from 85-95% depending on altitude. Below 80% requires close monitoring. Below 70% typically requires descent.

**1. Choose the Right Route and Duration** The single most important factor in preventing altitude sickness is taking enough time to acclimatize: - **5-6 day routes:** 65-70% summit success rate - **7 day routes:** 80-85% summit success rate - **8 day routes (Lemosho):** 90-95% summit success rate Our 8-day Lemosho route includes: - Gradual daily elevation gains (average 400-500m) - Two acclimatization days with "climb high, sleep low" - No rush to gain altitude - Extra night at 4,673m before summit attempt **2. "Climb High, Sleep Low"** This golden rule of altitude acclimatization means ascending to a higher altitude during the day, then descending to sleep lower. On Day 4 of our Lemosho route, we climb to Lava Tower (4,630m) for lunch, then descend to Barranco Camp (3,950m) to sleep. This accelerates acclimatization significantly. **3. Proper Hydration** - Drink 3-4 liters of water daily starting from day one - Urine should be pale yellow—dark urine signals dehydration - Avoid excessive coffee and alcohol (we prohibit alcohol on the mountain) - Monitor your water intake consciously **4. Slow, Steady Pace** - "Pole pole" (slowly, slowly) is the Swahili mantra - Your breathing should remain conversational - Let guides set the pace—never rush past them - Rest breaks are built into our schedule **5. Adequate Nutrition** - Eat even when appetite decreases (common at altitude) - Carbohydrates are easier to digest and provide quick energy - Our cooks prepare high-carb, familiar foods - Small, frequent meals work better than large ones **6. Consider Preventative Medication** Diamox (acetazolamide) is commonly used to prevent and treat AMS: - Speeds acclimatization by 20-30% - Take 125-250mg twice daily, starting day before ascent - Side effects: tingling fingers/toes, increased urination, taste changes - Consult your doctor 2-3 months before the climb - Alternative: natural supplements like Gingko Biloba (less proven) **7. Pre-Acclimatization** If possible: - Arrive in Tanzania 2-3 days before the climb - Spend a night at higher elevation before starting - Some climbers hike Mt. Meru (4,566m) first as acclimatization

**Mild AMS Treatment (Most Common):** - Rest and monitor symptoms - Continue hydration (3-4L daily) - Consider Diamox if not already taking - Ibuprofen or paracetamol for headaches - Usually resolves as body acclimatizes **Moderate AMS Treatment:** - Stop ascending immediately - Rest at current altitude for 24 hours - If symptoms don't improve: descend 500-1,000m - Diamox if not already using - Monitor closely for worsening **Severe AMS / HAPE / HACE Treatment:** - **Immediate descent** is the only cure - Descend 1,000m or more as quickly as safely possible - Supplemental oxygen if available - Hyperbaric chamber (Gamow bag) as temporary measure - Evacuation if necessary **Our Response Protocol:** 1. Daily health checks identify problems early 2. Mild symptoms: monitored closely, pace adjusted 3. Moderate symptoms: rest day added or altitude reduced 4. Severe symptoms: immediate descent with guide assistance 5. Medical evacuation available via helicopter (insurance required) **Never Continue Ascending with Moderate or Severe AMS** Going higher with symptoms can lead to HAPE or HACE, which are life-threatening. Our guides are trained to make the tough call to turn climbers back—this decision protects lives.

**Acclimatization Profile Comparison:** **5-Day Marangu Route (Coca-Cola Route):** - Rapid ascent: summit day reaches 5,895m from 4,700m base - No "climb high, sleep low" opportunities - Sleep at same altitude 2 nights - 65-70% success rate - Most likely route for altitude sickness **6-Day Machame Route:** - Better than 5-day but still rushed - One brief "climb high, sleep low" opportunity - Summit day still presents big jump - 70-75% success rate **7-Day Lemosho:** - Good acclimatization profile - Two days above 4,000m before summit - 80-85% success rate **8-Day Lemosho (Our Route):** - **Three days above 4,000m before summit** - **Two "climb high, sleep low" days** - **Maximum time for body to produce red blood cells** - **95% summit success rate** - **Lowest AMS incidence** **Daily Elevation Gains on Our Route:** - Day 1: 2,100m → 2,780m (+680m) - Day 2: 2,780m → 3,505m (+725m) - Day 3: 3,505m → 3,840m (+335m) - gradual day - Day 4: 3,840m → 4,630m → 3,950m (climb high, sleep low) - Day 5: 3,950m → 3,995m (+45m) - rest day essentially - Day 6: 3,995m → 4,673m (+678m) - Day 7: Summit day (sleep at 4,673m before attempting 5,895m) This measured approach lets your body adapt gradually, producing the extra red blood cells needed to transport oxygen at high altitude.

**Expect Some Discomfort** Everyone feels the altitude to some degree. Expect: - Slight headaches in the first few days - Nights with poor sleep - Moments of breathlessness - Reduced appetite These mild symptoms are normal and usually pass as you acclimatize. **Stay Positive** - Mental attitude significantly affects performance at altitude - Trust your preparation and our acclimatization schedule - Focus on the spectacular scenery, not discomfort - Remember: thousands summit successfully every year **Communicate Honestly** - Never hide symptoms from guides—they're trained to help - Altitude sickness is not weakness; it's physiology - Early reporting prevents serious problems - Our guides make decisions based on safety, not ego **Summit Night Reality** Summit night is when altitude hits hardest: - You'll start at midnight when body is most vulnerable - Extreme altitude at summit (50% oxygen) - Physical exertion after 6 days of hiking - Cold temperatures increase stress But every step at altitude makes the next one easier. The descent begins after sunrise, and your body will feel dramatically better below 4,500m.