How to Prevent Altitude Sickness on Your Trip to the Andes

It’s understandable to arrive in Cusco, San Pedro de Atacama, or the Salar de Uyuni and want to make the most of every minute. But knowing how to prevent altitude sickness while traveling can make the difference between admiring an extraordinary landscape and spending your first day with a headache, nausea, or extreme fatigue. Altitude isn’t something you can overcome with sheer willpower—it’s managed through a steady pace, planning, and paying attention to your body’s signals.

Altitude sickness, also known as soroche, occurs when the body receives less oxygen at high altitudes. It can affect both very active travelers and people in good physical condition, especially if they ascend too quickly. The good news is that most cases can be prevented or alleviated with simple precautions before and during your trip.

What Is Altitude Sickness and Why It Might Change Your Itinerary

At higher altitudes, air pressure is lower, and each breath delivers less oxygen to the body. In Andean destinations, this is particularly relevant: Cusco is located at about 3,400 meters above sea level, La Paz is over 3,600 meters, the Salar de Uyuni is around 3,650 meters, and some mountain passes in northern Chile and Bolivia reach even higher elevations.

The most common mild symptoms are headache, loss of appetite, restless sleep, dizziness, nausea, shortness of breath when walking, and unusual fatigue. Not all travelers experience these symptoms with the same intensity. Age, physical condition, rate of ascent, prior rest, and personal history all play a role, but being in good shape does not guarantee immunity.

The most common mistake is planning a strenuous hike, a long tour, or a heavy dinner as soon as you land. A well-planned first day is not a waste of time: it’s an investment in being able to better enjoy Machu Picchu, the Altiplano lakes, or the desert trails in the days that follow.

Practical Ways to Prevent Altitude Sickness While Traveling

The main rule is to ascend gradually whenever the itinerary allows. If you’re traveling from a low-altitude city to Cusco, La Paz, or Uyuni, set aside the first 24 to 48 hours for low-key activities. A short city tour, free time near the hotel, or a cultural experience that doesn’t involve physical exertion are much wiser choices than starting with a hike.

Sleeping at a lower altitude before ascending further also helps. For example, an itinerary combining the Sacred Valley and Cusco can be organized to spend the first night in the valley, which is at a lower altitude than the city of Cusco. In northern Chile, it’s best to arrive in San Pedro de Atacama, rest, and save the geysers, high mountain passes, or altiplano lagoons for when your body has had time to acclimate.

Hydration is another helpful strategy. Drink water regularly during flights, transfers, and excursions, without forcing yourself to consume excessive amounts. The dry air of the Altiplano and physical activity can lead to dehydration, which may worsen headaches and discomfort. Electrolyte drinks can be helpful if you’ve been walking a lot or if it’s hot, though they are no substitute for rest or acclimatization.

During your first few hours at high altitude, eat light meals and avoid alcohol. Very large meals, foods that are hard to digest, and alcoholic beverages can disrupt your sleep and confuse or intensify certain symptoms. Prioritize moderate portions, easily digestible carbohydrates, fruits, and soups—especially on the first night.

It’s also a good idea to walk slowly. This is no minor recommendation: climbing stairs, carrying luggage, or rushing to catch up with a tour can feel very different at high altitudes. Take breaks, dress in layers, and avoid getting chilled after sweating. In cold, dry destinations, fatigue increases when your body has to adapt to both the climate and the altitude.

Acclimatization Based on Your Andean Destination

Not all trips require the same amount of time to adjust. A day trip from Santiago to high-altitude areas does not involve the same level of exposure as spending several nights in Bolivia or Peru. Your itinerary should take into account both the maximum altitude and the altitude at which you’ll be sleeping.

These values are approximate and vary by country, season, provider, and travel coverage. A pulse oximeter can be useful for travelers experienced with high altitudes, but a single reading alone does not determine whether you can continue an activity. Your overall condition and the progression of your symptoms matter more.

In Cusco, arriving, transferring to your hotel, resting, and engaging in a light activity the next day is usually an excellent approach. For a hike like the Mountain of Seven Colors, which exceeds 5,000 meters at some points, it is advisable to have spent several days acclimatizing and to confirm with the tour operator that the pace, stops, and transportation options are tailored to your needs.

In San Pedro de Atacama, your first excursions can focus on the town, the Valley of the Moon, or less demanding outings. The Altiplano lagoons and the Tatio Geysers, due to their altitude and early start times, are usually best enjoyed after one or two days of acclimatization. In Uyuni, where changes in elevation and temperature are part of the adventure, choosing a tour with clear logistics, suitable vehicles, and well-prepared guides adds a real layer of safety.

Medications and Local Remedies: When They Help and When They Don’t

Some travelers ask about preventive medications for altitude sickness. This decision should be made with a healthcare professional before the trip, especially if you have allergies, are pregnant, have chronic conditions, or are undergoing treatment. Do not self-medicate or use medications recommended by other travelers just because they worked for them.

Coca tea and other traditional herbal infusions are part of Andean culture and may be comforting for some people. However, they are no substitute for gradual acclimatization, a medical evaluation, or descending if warning signs appear. Additionally, anyone who must undergo drug testing or has medical restrictions should consult their doctor before consuming these beverages.

Carry your regular medications in your carry-on luggage and let the guide know if you have a condition that may require attention. A well-coordinated trip allows you to adjust your pace and exertion levels, but you must share this information before starting a mountain hike.

Warning Signs: When to Stop and Ask for Help

A mild headache that improves with rest and hydration is common during acclimatization. What should not be considered normal is discomfort that worsens as you continue to ascend. Shortness of breath at rest, chest pain or tightness, confusion, fainting, a persistent cough, lack of coordination, or continuous vomiting require immediate medical attention.

In such cases, do not continue the hike to “see if it goes away.” Stop the activity, inform the guide, seek medical assistance, and descend if the professional team advises it. At high altitudes, reacting quickly is a responsible decision, not a sacrifice of the experience.

Frequently Asked Questions About Preventing Altitude Sickness While Traveling

How many days do I need to acclimate?

It depends on the altitude upon arrival and the planned activity. For destinations like Cusco or La Paz, it’s common to allow between one and three days before a strenuous hike. If the trip includes passes above 4,500 meters, it’s best to be even more conservative.

Does altitude sickness only affect older people or those with health problems?

No. It can affect any traveler, even young and athletic people. People with heart or lung conditions, sleep apnea, or other medical conditions should consult their doctor before traveling to high altitudes.

Should I cancel my trip if I have a headache upon arrival?

Not necessarily. Rest, stay hydrated, eat light meals, and avoid continuing to ascend. If the headache is severe, doesn’t improve, is accompanied by other concerning symptoms, or gets worse, seek medical evaluation before continuing.

Can I exercise during acclimatization?

Yes, but it should be gentle. Leisurely walks and city tours can help keep you active without overexerting yourself. Save trekking, intense cycling, and high-altitude excursions for after you’ve acclimated.

South America rewards those who travel without rushing: leave room to breathe, sleep well, and listen to your body. With a gradual itinerary and the support of an expert operator like TravelAndes, altitude ceases to be a concern and becomes part of the adventure you came here to experience.