Altitude Sickness (Acute Mountain Sickness)

Altitude sickness, also known as Acute Mountain Sickness (AMS), can occur when you travel to high elevations too quickly, typically above 2,500 meters (8,200 feet). It is common on high mountains such as Mount Kilimanjaro, but it is preventable and manageable with the right approach.

What Causes Altitude Sickness?

At high altitude, the air contains less oxygen. If your body does not have enough time to adjust, symptoms of altitude sickness may appear.

Common Symptoms of Altitude Sickness

Symptoms usually start 6–24 hours after gaining altitude and may include:

• Headache

• Nausea or vomiting

• Dizziness or lightheadedness

• Fatigue or weakness

• Shortness of breath during exertion

• Loss of appetite

• Difficulty sleeping

Types of Altitude Sickness

1. Mild AMS

• Headache and tiredness

• Usually improves with rest and hydration

2. Moderate AMS

• Persistent headache

• Nausea and reduced energy

• Needs close monitoring and slower ascent

3. Severe Altitude Illness (Rare but Serious)

Includes conditions affecting breathing or balance and requires immediate descent and medical attention.

How to Prevent Altitude Sickness

• Walk slowly (“pole pole”)

• Choose longer routes for better acclimatization

• Drink plenty of water

• Eat well, even if appetite is low

• Avoid alcohol and smoking

• Get enough rest

• Follow your guide’s instructions at all times

Treatment and Management

• Rest at the same altitude if symptoms are mild

• Do not climb higher with worsening symptoms

• Descend to a lower altitude if symptoms increase

• Inform your guide immediately if you feel unwell

Professional guides regularly monitor climbers and are trained to respond quickly.

Medications

Some climbers use preventive medication prescribed by a doctor. Always consult a healthcare professional before your trip.

Who Can Get Altitude Sickness?

Anyone can be affected—fitness level, age, and gender do not guarantee protection. The key factor is how fast you ascend.

Final Advice

Altitude sickness is serious but highly manageable with proper planning, slow ascent, and experienced guides. Listening to your body and communicating early is the best way to stay safe.