Understanding Altitude Sickness on Kilimanjaro
Altitude sickness — also called Acute Mountain Sickness (AMS) — is the single biggest challenge on Kilimanjaro and the most common reason climbers turn back before the summit. It is caused by reduced oxygen availability at altitude and can affect anyone regardless of fitness level. Understanding AMS, recognising its symptoms, and knowing how to prevent it are the most important things you can do to ensure a successful summit.
Symptoms of AMS
Mild AMS symptoms include headache, fatigue, dizziness, nausea, and loss of appetite — these are normal at altitude and are not necessarily a sign to descend. Severe AMS includes persistent vomiting, extreme fatigue, loss of coordination, shortness of breath at rest, and persistent severe headache. High Altitude Pulmonary Edema (HAPE) and High Altitude Cerebral Edema (HACE) are rare but life-threatening — immediate descent is required.
Prevention: The Most Effective Strategies
Choose a longer route: The single most effective prevention is spending more nights on the mountain. A 7-day Machame or 8-day Lemosho itinerary gives your body significantly more acclimatisation time than the 5-day Marangu. Never rush Kilimanjaro.
Go slowly: "Pole pole" — the Swahili philosophy of going slowly — is not just advice, it is the scientific basis for successful acclimatisation. Your guide will enforce this on your behalf.
Hydrate constantly: Drink at least 3–4 litres of water per day. Dehydration accelerates AMS symptoms.
Diamox (Acetazolamide): This prescription medication accelerates acclimatisation and is widely used by Kilimanjaro climbers. Consult your doctor before your trip. Standard dose is 125–250mg twice daily, starting 24 hours before ascent.
Avoid alcohol: Alcohol suppresses respiration and worsens AMS. Avoid it entirely for 24 hours before and during the climb.
What Our Guides Do
All Super Game Tanzania guides are certified in Wilderness First Aid and conduct twice-daily oxygen saturation and heart rate checks using pulse oximeters. Our guides will always recommend descent if they believe a trekker's health is at risk — safety is non-negotiable on our treks.