Have questions?
Call +255 783 884 129
Call +255 783 884 129
Altitude Sickness, also known as Acute Mountain Sickness (AMS), is the biggest challenge climbers face when ascending Mount Kilimanjaro. As you gain altitude, the air becomes thinner, and the level of oxygen decreases. The higher you go, the more difficult it becomes for your body to absorb the oxygen it needs to function. This sudden change puts stress on your body, and if not properly managed, it can result in serious health issues or force you to abandon the climb before reaching the summit.
The main cause of altitude sickness is gaining altitude too quickly without giving the body enough time to adjust. When you ascend rapidly, your body cannot adapt to the decreasing oxygen levels, which leads to symptoms like headache, nausea, dizziness, and shortness of breath. On Kilimanjaro, many climbers begin the trek at around 1,800 meters and climb up to nearly 6,000 meters in just a few days. Without proper acclimatization, this can trigger AMS. Other contributing factors include dehydration, overexertion, and ignoring early symptoms of discomfort.
The symptoms of altitude sickness usually begin within 6 to 24 hours after reaching a higher altitude. The most common signs include a persistent headache, nausea or vomiting, dizziness, fatigue, and difficulty sleeping. You may also feel breathless, especially when walking or even while resting. If left untreated or if the climber continues to ascend despite these symptoms, it can develop into more serious forms of altitude illness such as High Altitude Pulmonary Edema (HAPE) or High Altitude Cerebral Edema (HACE), which can be life-threatening.
The most effective way to prevent altitude sickness is by choosing a longer route that gives your body enough time to acclimatize. Routes like Lemosho, Machame (7-day), or the Northern Circuit are highly recommended because they have a gradual ascent profile and “climb high, sleep low” opportunities. This allows the body to slowly adapt to higher altitudes. It’s also important to walk slowly, even if you feel strong. Going “pole pole” (slowly slowly) is a key Kilimanjaro strategy for success.
Staying well-hydrated is another critical step. Drink at least 3–4 liters of water each day during the trek. Dehydration makes it harder for your body to adapt to altitude. Avoid alcohol, smoking, and heavy meals as they can interfere with oxygen absorption and digestion. Eating light, balanced meals is better for energy and digestion at high elevations.
Another prevention method is the use of medication like Acetazolamide (Diamox). Many climbers use Diamox to help their bodies acclimatize faster. It can reduce symptoms like headaches and breathlessness. However, it’s essential to speak to a doctor before your trip to see if it’s suitable for you. Your tour operator should also monitor your symptoms daily and be prepared with oxygen or evacuation plans in case of emergencies.
If you begin to experience symptoms of altitude sickness, it’s important to inform your guide immediately. Do not ignore the signs or try to hide them to avoid embarrassment or delay. Guides on Kilimanjaro are trained to monitor oxygen levels and symptoms using pulse oximeters. Often, the first response to altitude sickness is to rest, hydrate, and descend slightly to a lower elevation. In most cases, even a small descent of 300–500 meters can provide great relief.
Pushing forward when you have moderate or severe symptoms can be dangerous and may result in evacuation or hospitalization. Always listen to your body and to your guide. Reaching the summit is a goal, but your health and safety are the priority.
100% local tour company based in Tanzania. We offer Kilimanjaro climbs, wildlife safaris, Zanzibar trips, and cultural tours. Travel with experts. Support local.
© 2025 Bush Lion Tours. All Rights Reserved. | Website by Bush Lion Team 🇹🇿