Machu Picchu sits at 2,430 meters (7,972 feet), which is high enough to cause altitude sickness but moderate compared to nearby Cusco at 3,400 meters (11,155 feet). Most travelers feel the altitude not at the ruins themselves but in Cusco, where nearly every trip to Machu Picchu begins. Preparing well means understanding where the altitude will hit hardest, giving your body time to adjust, and knowing what to do if symptoms appear.
The Elevations You’ll Actually Face
The trickiest part of a Machu Picchu trip is that the highest altitude isn’t at the ruins. Cusco, where most international flights land, sits at 3,400 meters (11,155 feet). That’s nearly 1,000 meters higher than Machu Picchu itself. Many travelers step off the plane in Cusco and immediately feel lightheaded, short of breath, or nauseated before they ever reach the ruins.
Aguas Calientes, the small town at the base of Machu Picchu where you catch the bus up to the entrance, is only 2,040 meters (6,693 feet). The citadel is at 2,430 meters (7,972 feet), and if you climb Huayna Picchu, the iconic peak behind the ruins, you’ll reach 2,720 meters (8,924 feet). None of these are extreme elevations. The real challenge is Cusco, and if you’re trekking, the passes along the way. The Salkantay Trek tops out at 4,600 meters (15,090 feet), and Dead Woman’s Pass on the classic Inca Trail reaches roughly 4,200 meters (13,780 feet).
Give Yourself Two to Three Days in Cusco
The single most effective thing you can do is arrive early and take it easy. Two to three days of acclimatization in Cusco before heading to Machu Picchu or starting a trek is the standard recommendation. During that time, your body increases its red blood cell production and adjusts its breathing patterns to compensate for the thinner air.
During those first days, keep activity light. Walk around Cusco, visit a market, eat a slow meal. Resist the urge to do a strenuous hike on day one. Your body is working hard even while you’re sitting still. Some travelers use a “sleep low, explore high” strategy by spending their first nights in the Sacred Valley, which sits lower than Cusco at around 2,800 meters, then moving up to Cusco once they’ve had a day or two to adjust. This is a smart approach if your itinerary allows it.
Fitness Won’t Protect You
One of the most common misconceptions is that being in great shape prevents altitude sickness. It doesn’t. Research has found no correlation between physical fitness and altitude illness risk. Marathon runners and couch potatoes are equally vulnerable. The real risk factors are your rate of ascent, how high you go, how well you hydrate, and individual variability that’s largely genetic.
That said, being physically fit still matters for the trek itself. You’ll enjoy the Inca Trail or the climb up Huayna Picchu far more if your legs and lungs are conditioned for sustained effort. Just don’t assume that your fitness will spare you from headaches or nausea at altitude. Those are separate problems driven by how quickly your body adapts to lower oxygen levels.
Recognize the Symptoms Early
Acute mountain sickness typically starts within hours of arriving at altitude. The hallmark symptom is a headache, and the clinical definition requires a headache plus at least one other symptom: nausea, fatigue, dizziness, or difficulty sleeping. Most cases at Machu Picchu elevations are mild and resolve on their own within a day or two as your body acclimatizes.
What you need to watch for is a shift from mild discomfort to something more serious. High-altitude cerebral edema, a dangerous swelling of the brain, typically develops 24 to 72 hours after a gain in altitude. It’s characterized by confusion, difficulty walking in a straight line, or unusual changes in behavior. This is a medical emergency that requires immediate descent. It’s rare at Machu Picchu’s moderate elevation but more of a concern on the high passes of multi-day treks.
Ask Your Doctor About Acetazolamide
Acetazolamide (sold as Diamox) is the most widely used preventive medication for altitude sickness. It works by making your blood slightly more acidic, which triggers your body to breathe faster and take in more oxygen. The CDC recommends starting it the day before your ascent and continuing for the first two days at altitude, or longer if you’re still climbing.
The standard preventive dose is 125 mg twice a day, which is enough to reduce symptoms while minimizing side effects. The most common side effect is tingling in the fingers and toes, which is harmless but can be startling if you’re not expecting it. The medication also changes how carbonated drinks taste, making beer and soda flat and metallic. It’s a prescription medication, so you’ll need to see your doctor before you travel.
Hydration and Diet at Altitude
Dehydration sneaks up on you at altitude. The dry air and increased breathing rate pull moisture from your body faster than you’d expect. During activity, aim for 400 to 800 milliliters of water per hour, roughly two to three cups. Outside of hiking hours, keep sipping steadily. Water, soups, and herbal teas all count.
Your body also shifts toward burning more carbohydrates at altitude. For moderate trekking and acclimatization, a target of 5 to 8 grams of carbohydrates per kilogram of body weight per day is reasonable. For a 70-kilogram person, that’s 350 to 560 grams of carbs daily. In practice, this means favoring bread, rice, pasta, potatoes, and fruit over heavy, fatty meals. Many travelers experience reduced appetite at altitude, so eating smaller meals more frequently can help you keep your energy up without feeling overly full.
Alcohol deserves caution during your first couple of days. It’s a mild diuretic that can worsen dehydration, and its effects feel amplified at altitude. A single beer in Cusco can hit you like two or three at sea level. Give yourself at least a day or two before indulging.
Coca Tea: A Local Tradition
Hotels, restaurants, and locals throughout the Cusco region will offer you coca leaf tea, known as mate de coca. Peruvians have used it for centuries to ease altitude discomfort, and it’s legal and culturally ubiquitous throughout the Andes. Many travelers find it soothing, though rigorous clinical evidence for its effectiveness against altitude sickness is limited.
One concern for international travelers is drug testing. Coca leaves do contain trace amounts of cocaine, though the quantities are vanishingly small. Chewing about 30 grams of leaves produces blood cocaine levels around 98 nanograms, a nearly undetectable amount. Still, even these trace levels can trigger a positive result on sensitive drug tests. If you’re subject to workplace testing, keep this in mind.
Plan Your Itinerary Strategically
The smartest way to structure a Machu Picchu trip is to let geography work in your favor. If you fly into Cusco, you’re starting at the highest point of your journey. Spend your acclimatization days there, then descend to Aguas Calientes and Machu Picchu, where you’ll feel significantly better at the lower elevation.
If you’re doing a multi-day trek like the Inca Trail or the Salkantay Trek, the calculus changes. You’ll be climbing well above Cusco’s elevation on the high passes, making those acclimatization days even more important. Some trekkers add a day hike to a higher elevation near Cusco before their trek, spending a few hours above 4,000 meters and then descending to sleep. This “climb high, sleep low” approach helps your body prepare for the passes without the strain of sleeping at extreme altitude.
Many higher-end hotels in Cusco offer rooms with supplemental oxygen, which can ease your first night. If you’re particularly concerned about altitude, booking one of these hotels for your arrival night can make a noticeable difference in sleep quality. Oxygen is also available at some clinics and pharmacies in town if symptoms become uncomfortable.