Kilimanjaro Risks: Altitude Sickness, Summit Success Rate & Common Mistakes

Why experience helps – but is not enough

I have completed many long walks.
Extreme hikes involving heat, nights with little sleep, and distances where the body eventually functions on autopilot. Blisters on my feet, swollen joints, rolling an ankle in the final kilometres. Even a complete collapse after the finish line – overheating, total exhaustion, circulation gone.

All of that comes with events like these.
And yes: experience helps. You know your body better, know when you need to eat, drink or slow down. You know that pain will come – and pass again.

But one thing is crystal clear: Kilimanjaro is fundamentally different.

Not because you “suffer more extremely” there.
But because the nature of the risks shifts massively.

I did a lot of research to give myself an overview of the potential risks, their likelihood and their impact on the mountain. This overview is intended to make it easier for you to get started.

Categories of risk – from everyday issues to life-threatening dangers

1. “Normal” hiking problems

(highly likely – usually manageable)

Many people will know these risks from long hikes, multi-day tours or events such as Mammutmarsch or Megamarsch.

Typical:

• Blisters, chafing
• Overworked knees and ankles
• Muscle tightness
• Mild dehydration
• Sunburn

How this applies to Kilimanjaro:
These problems occur very frequently – in some cases even more often than on extreme hikes. The reasons:

• Many days with major elevation gain back to back
• Carrying daypacks
• Dust, cold, wind → dry skin
• Less recovery due to the altitude and “thinner” air

👉 Risk: high
👉 Severity: low
👉 Control/mitigation: very manageable (shoes, socks, foot care, pace)

2. Orthopaedic/mechanical risks

(medium to high – often underestimated)

Kilimanjaro is not technically a climbing mountain, but it is not a walk in the park either.

Critical situations:

• Scree slopes (especially on the descent)
• Fine, slippery volcanic sand
• Fatigue + loss of concentration
• Darkness on summit night

Typical consequences:

• Rolling an ankle
• Sprained ligaments
• Falls
• Back problems caused by repetitive strain

Comparison with extreme hikes:
On a Mammutmarsch:

• mostly flat
• mainly surfaced paths
• good visibility
• you can stop at any time
• large group
• frequent aid stations

On Kilimanjaro:

• no quick way out
• medical help is delayed
• the descent is often more dangerous than the ascent

👉 Risk: medium
👉 Severity: medium
👉 Control/mitigation: good footwear, trekking poles, deliberately slow pacing

3. Cold, wind and frostbite

(low likelihood – serious consequences)

Many people underestimate the cold at the equator.

Facts:

• Summit night is often between -10 °C and well below -20 °C
• Strong wind
• Exhaustion → reduced heat production
• Altitude → poorer circulation
• No classic ways to warm up, such as huts or fires
• Often noticed too late, making it difficult to get “warm again”

Particularly at risk:

• Fingers
• Toes
• Nose
• Ears

Why this differs from winter hiking:

• No “quickly get somewhere warm”
• No car, no hut
• Fatigue prevents an early response

👉 Risk: low to medium
👉 Severity: high
👉 Control/mitigation: clothing, layering, self-monitoring

4. Acute mountain sickness (AMS)

(common – must be taken seriously)

The central risk on Kilimanjaro.

Common symptoms:

• Headache
• Nausea
• Loss of appetite
• Sleep disturbance
• Exhaustion despite a slow pace

Important:
AMS can affect anyone – regardless of:

• Fitness
• Age
• Experience
• Training

Statistically:

• Mild AMS symptoms: very common
• Successful summit ascent: approx. 60–70 % (depending on the route)

👉 Risk: high
👉 Severity: medium
👉 Control/mitigation: slow pace, hydration, acclimatisation, honesty with yourself

5. Pulmonary and cerebral oedema (HAPE & HACE)

(extremely rare – but life-threatening)

The most serious, but rarest, risks.

HAPE (pulmonary oedema):

• Shortness of breath at rest
• Coughing (sometimes frothy)
• Sudden decline in performance
• “I can’t keep up anymore”

HACE (cerebral oedema):

• Coordination problems
• Confusion
• Changes in behaviour
• Unsteady gait

The crucial point:
👉 The risk increases when warning signs are ignored.
There are almost always early signs.

Comparison with extreme hikes:

• There is no altitude-related organ damage there
• Exhaustion ends at the finish line – not in an emergency

👉 Risk: low
👉 Severity: extremely high
👉 Control/mitigation: descend immediately, take your guides seriously

Every metre is a gift

In the end, Kilimanjaro is not a mountain you “conquer”. It lets you climb it – or it does not. Preparation, respect and self-reflection matter more than ambition or training kilometres. For me, this project is neither a competition nor something to prove. It is a conscious step outside my comfort zone, with my eyes open to the risks and with a clear priority: returning home healthy. Every additional metre is a gift – not something to take for granted, but something earned.