Altitude Sickness in the Atacama — What You Need to Know
What altitude sickness actually feels like
Mild: you notice you are breathing a bit more, maybe a slight headache or heavy limbs. You can still hike or sit in a van. This is normal above 2,400 m for many visitors and goes away in hours. Serious (rare): intense headache, vomiting, confusion. If that happens, descend immediately and tell the guide. On a tour, the guide watches for it and will help. Most people at 4,320 m feel mild-to-nothing. Some feel a headache. Very few need to exit early. But respect the altitude; it is real.
The acclimatization order that works
Day 1–2 at 2,408 m: Moon Valley ($60) and sandboarding ($89) or Baltinache ($58) are ~2,500 m. Stargazing ($33) at town level. You are settling, eating, drinking water. Let your body adjust. Day 3+: El Tatio ($60, 4,320 m) or Piedras Rojas ($85, ~4,000 m). By now, your body has acclimatized. Most visitors do fine. This is not medical advice — it is what every guide and the Atacama tourism board recommend. Follow it and altitude is a non-issue.
What to do the night before El Tatio
You will be picked up at ~4:30 am for a pre-dawn El Tatio sunrise ($60). The night before: eat normally, drink water (at least 2 L), avoid alcohol, get sleep. On the tour morning: eat a light breakfast (the operator provides one at the site). Bring layers and gloves; you will be cold and tired but awake. Most visitors find it exhilarating, not grueling. Yes, it is early. Yes, it is freezing. Yes, it is worth it.
Spend day 1–2 low (2,500 m), save El Tatio and Piedras Rojas for day 3+. Drink 2+ L water daily. Mild headache above 4,000 m is normal. Severe symptoms are rare on tours; the guide helps if needed.
Medication and acclimatization
Coca tea (made from coca leaves, legal in Chile) is a traditional remedy. Some visitors swear by it; science is mixed. Ibuprofen or acetaminophen can help a mild headache. Prescription altitude medication (like Diamox) exists but is overkill for the Atacama if you follow the acclimatization order. Hydration and rest are your best tools. If you have a heart condition or chronic lung disease, talk to your doctor before high-altitude tours.
One more thing: this is itinerary advice, not medical advice
I can tell you the altitude and the order that works. I cannot diagnose altitude sickness or tell you whether it is safe for you personally. If you have serious health concerns, consult a doctor before you book. On the tour, the guide is trained to recognize symptoms and help. Trust them.
Frequently asked questions
Do you get altitude sickness in the Atacama?
Mild symptoms (headache, breathlessness) are common above 4,000 m, but serious sickness is rare on tours. San Pedro is 2,408 m (mild breathing change). El Tatio is 4,320 m. Spend day 1–2 low, save high tours for day 3+. Drink water. Follow the order and you are fine.
How high is El Tatio?
About 4,320 m, one of the world's highest geyser fields. Pre-dawn temperatures around −10°C in winter. Mild headache or breathlessness hits some visitors. The guide watches for symptoms. Most people feel fine; some get a headache that passes after a few hours.
What are the symptoms of altitude sickness?
Mild: slight headache, breathlessness, heavy limbs — normal above 2,400 m, goes away in hours. Serious (rare): intense headache, vomiting, confusion. If serious symptoms start, tell the guide to descend. Hydration and acclimatization prevent most issues.
Can I take altitude medication?
Coca tea is traditional. Ibuprofen helps a mild headache. Prescription medication (Diamox) is overkill if you acclimatize (day 1–2 low, day 3+ high). Hydration is your best tool. If you have heart/lung conditions, consult a doctor.