Altitude sickness is the biggest reason climbers don't summit — not fitness, not weather. What it is, how to recognize it, how to prevent it, and when to turn back.
The body's initial response to altitude. Almost everyone experiences some form above 3,000m. Think of it as altitude jet-lag.
Brain swelling from prolonged altitude exposure. Starts as worsening AMS but becomes neurological. Life-threatening if ignored.
Fluid in the lungs. Can develop rapidly, often without prior warning signs. Also life-threatening.
7-8 days minimum. Lemosho and Northern Circuit give your body time to adjust. Rushed 5-6 day routes show dramatically lower success and higher AMS rates.
When route allows, day-hike to a higher point, then descend to a lower altitude to sleep. Best acclimatization pattern. Our guides build this in where possible.
4-5 liters of water daily minimum. Dehydration mimics and worsens AMS. Your urine should be clear. Electrolyte tablets help.
'Slowly slowly' in Swahili. Walk so slowly you feel embarrassed. Racing the first few days costs you on summit day.
Acetazolamide speeds acclimatization. Not a replacement for good protocol but reduces AMS severity. Discuss with your travel doctor 4 weeks out. Trial it at home first.
Carbohydrates are fuel. Loss of appetite is a symptom you push through — force small regular portions. Soup, rice, bananas, energy bars.
Brand name for acetazolamide — a mild diuretic that causes your kidneys to excrete bicarbonate, which triggers deeper breathing. This raises blood oxygen, effectively accelerating acclimatization.
Most of our climbers do. It's not a replacement for proper protocol, but it meaningfully reduces AMS severity at the cost of minor side effects. Discuss with your travel doctor. Some people prefer climbing without — it's a personal choice.
125mg twice daily, starting 24 hours before reaching 3,000m, continuing through summit day. Your doctor will prescribe based on your health profile. Do not exceed — more isn't better.
Tingling in fingers/toes (common), frequent urination (expected — it's a diuretic), altered taste of carbonated drinks (harmless), occasionally fatigue. Most resolve after stopping.
Anyone with sulfa allergies, severe kidney disease, or some liver conditions. Always get a doctor's clearance and trial it at home before your trip — reactions can happen.
Every climb is led by certified mountain guides trained in altitude medicine, with pulse oximetry and emergency oxygen at every camp. AMREF Flying Doctors coverage is included. Your safety is non-negotiable.
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