What to Do if You Experience Altitude Sickness on Kilimanjaro

Climbing Mount Kilimanjaro is a once-in-a-lifetime adventure, but it comes with its challenges — one of the most common being altitude sickness, also known as Acute Mountain Sickness (AMS). As you ascend Africa’s tallest mountain, the air gets thinner and your body receives less oxygen. If not managed properly, this can lead to serious health risks and force you to abandon your summit attempt. Understanding what to do if you start experiencing symptoms is essential for a safe and successful climb.

Recognize the Symptoms of Altitude Sickness

Early recognition is the most important factor in managing AMS. Common symptoms include:

• Persistent headaches
• Nausea and vomiting
• Dizziness or lightheadedness
• Fatigue or weakness
• Loss of appetite
• Shortness of breath even while resting
• Sleep disturbances

In severe cases, altitude sickness can develop into High Altitude Cerebral Edema (HACE) or High Altitude Pulmonary Edema (HAPE), both of which are life-threatening conditions that require immediate descent and medical attention.

Stop and Communicate

If you feel unwell, stop climbing immediately and inform your Kilimanjaro guide. Don’t try to push through, as altitude sickness doesn’t simply “go away” by continuing upward. Guides are trained to assess your condition and make decisions regarding whether you can continue or need to descend.

Descend If Necessary

The most effective treatment for altitude sickness is descent. If your symptoms are moderate to severe or not improving with rest, your guide will initiate a descent plan to a lower altitude. In most cases, symptoms improve rapidly after losing elevation.

Hydration and Nutrition

Drink plenty of water — dehydration can worsen altitude sickness. Aim for 3–4 liters per day. Additionally, eat regularly even if you don’t feel hungry. High-energy, carbohydrate-rich foods can help your body adapt more efficiently to the thin air.

Medication Options

If approved by your doctor before the climb, you may take Diamox (Acetazolamide), a medication known to reduce symptoms of altitude sickness and aid in acclimatization. Your guide may also carry oxygen or other emergency medication, but these are reserved for more serious cases.

Rest and Acclimatize

If symptoms are mild, resting at the current altitude for a day or two may allow your body to acclimate. Acclimatization hikes — climbing higher during the day and sleeping at a lower altitude — can be beneficial if you have time built into your itinerary.

Don’t Rush Your Climb

Taking a longer route on Kilimanjaro, such as the Lemosho or Northern Circuit, gives your body more time to adjust and greatly reduces your risk of altitude sickness. If you’ve experienced AMS before, it’s best to avoid shorter, steeper routes.

Conclusion: Listen to Your Body

Altitude sickness should never be ignored. While many hikers experience mild symptoms that resolve with rest, some may face serious consequences if they try to “tough it out.” Always listen to your body, communicate with your guide, and prioritize safety over summiting.