Altitude Sickness in Central & South America

A Traveler’s Guide by Hey Doctor

Traveling through the Andes is an unforgettable experience. Destinations such as Cusco, Machu Picchu, Lake Titicaca, La Paz, Huaraz and high-altitude trekking routes attract thousands of travelers every year.

However, arriving at high altitude too quickly can cause *Altitude Sickness*, also known as Acute Mountain Sickness (AMS).

Understanding how to acclimatize and recognize the warning signs can help you enjoy your trip more safely.

What Is Altitude Sickness?

Altitude sickness occurs when the body has difficulty adapting to the lower oxygen levels at high altitude.

The risk generally becomes more important above approximately 2,500 meters (8,200 feet), although people can react differently to altitude.

Common high-altitude destinations in Latin America include:

• 🇵🇪 Cusco

• 🇵🇪 Lake Titicaca

• 🇵🇪 Huaraz

• 🇵🇪 Salkantay and other high-altitude treks

• 🇧🇴 La Paz

• 🇪🇨 High-altitude areas of Ecuador

• 🇨🇱 High-altitude areas of Chile and Argentina

  
  

Why Does It Happen?

At high altitude, atmospheric pressure is lower and there is less oxygen available with each breath.

Your body needs time to adapt. This process is called acclimatization.

The most important period for acclimatization is generally the first 3-5 days after ascending. Going too high too quickly increases the risk of altitude illness.

What Are the Symptoms?

Symptoms of mild Acute Mountain Sickness can include:

• 🤕 Headache

• 😵 Dizziness

• 🤢 Nausea

• 🤮 Vomiting

• 😴 Fatigue

• Loss of appetite

• Difficulty sleeping

• Shortness of breath during activity

Symptoms often begin within several hours after reaching a higher altitude.

Do not continue ascending if you are developing symptoms.

How Can You Acclimatize?

The best protection against altitude sickness is gradual ascent.

🏔️ Give Your Body Time

When possible:

• Ascend gradually.

• Avoid going directly from low altitude to a high sleeping altitude in one day.

• Above approximately 3,000 meters, avoid increasing your sleeping altitude by more than about **500 meters per day**.

• Consider an additional acclimatization day for significant increases in sleeping altitude.

🛌 *Take It Easy*

During your first 48–72 hours at high altitude:

• Avoid intense exercise.

• Rest more than usual.

• Avoid alcohol, particularly during the first 48 hours.

• Stay hydrated.

• Allow your body to adapt before starting demanding trekking activities.

Can Altitude Sickness Be Prevented?

There is no way to guarantee that you will not experience altitude sickness, but gradual acclimatization significantly reduces the risk.

For travelers who need to ascend rapidly, a doctor may recommend *acetazolamide (Diamox)* to help speed acclimatization and prevent Acute Mountain Sickness.

The decision to use medication should be made with a healthcare professional based on your itinerary and individual medical circumstances.

Do not take prescription medication without appropriate medical advice.

What Should You Do If Symptoms Appear?

If you develop mild symptoms:

1. Stop Ascending

• Do not continue climbing to a higher sleeping altitude while symptoms are present.

2. Rest

• Reduce physical activity and allow your body time to adapt.

3. Stay Hydrated

• Drink fluids normally, but avoid excessive water consumption.

4. Treat the Symptoms

• A healthcare professional may recommend medication for headache, nausea or other symptoms.

5. Monitor Your Condition

• If symptoms improve, continue acclimatizing before ascending further.

• If symptoms *get worse or fail to improve*, descent to a lower altitude may be necessary.

🚨 *When Is Altitude Sickness an Emergency?*

• Two severe forms of altitude illness require urgent medical attention:

• High-Altitude Cerebral Edema (HACE)

Warning signs include:

• Confusion

• Difficulty walking or loss of coordination

• Extreme drowsiness

• Changes in mental status

• Loss of consciousness

High-Altitude Pulmonary Edema (HAPE)

Warning signs include:

• Shortness of breath at rest

• Difficulty breathing

• Severe weakness

• Cough

• Chest tightness

• Blue or gray lips or skin

These conditions can become life-threatening.

Immediate descent and emergency medical treatment are required.

Oxygen should be used when available.

🏔️ Important for Travelers in Peru

Many popular Peruvian destinations are located at significant altitude.

For example:

Cusco: approximately 3,339 m

Lake Titicaca: approximately 3,812 m

Salkantay Trek: reaches approximately 4,630 m

Travelers arriving from sea level or low altitude can therefore experience symptoms soon after arrival.

If your itinerary includes Cusco, Rainbow Mountain, Salkantay, Ausangate, Huaraz or Lake Titicaca, plan your acclimatization carefully.

Hey Doctor - Medical Assistance for Travelers

Altitude sickness can be frightening when you're far from home and unsure whether your symptoms are normal.

Hey Doctor provides medical assistance and guidance for travelers throughout Latin America.

We can help travelers with:

👨‍⚕️ Medical consultations

🏥 Finding clinics and hospitals

💊 Medication and pharmacy guidance

🌎 Language assistance

🩺 Medical guidance for travelers

✈️ Travel insurance guidance

Feeling sick at high altitude?

Don't ignore worsening symptoms. Contact Hey Doctor for professional medical guidance.

- Hey Doctor -

Medical Assistance for Travelers in Latin America.