This is the page I'd ask every Spiti traveler to read before anything else on the practical side, because it's the one thing on this trip that can genuinely derail it — or worse, become dangerous — if ignored. Spiti isn't a hill station where altitude is a footnote. It's a genuinely high-altitude trip, and treating it that way from the start makes the difference between a memorable circuit and a miserable one. For the full trip picture, see our complete Spiti Valley guide.
A note before we go further: this is general travel information, not medical advice. If you have a heart or lung condition, are pregnant, or have any concern about how altitude might affect you specifically, talk to a doctor before you travel, and consider discussing preventive medication like Diamox with them in advance.
How High Spiti Actually Is
This is worth sitting with for a moment, because the numbers surprise people who think of Spiti as "just Himachal."
Kaza, the valley's main town and your base for most of the trip, sits at roughly 3,650 metres. That alone is higher than most travelers have ever been.
From there, it only goes up. Kibber sits around 4,270 metres. Langza and Hikkim sit around 4,400 metres. Komic, one of the highest motorable villages anywhere, reaches roughly 4,587 metres. Chandratal sits around 4,300 metres. Kunzum Pass, if you're doing the Manali side, tops 4,500 metres.
For comparison, altitude sickness risk is generally considered to start becoming relevant above 2,500 metres, and climbs meaningfully above 3,500. Everywhere on the core Spiti circuit sits at or above that line. This isn't a trip with one high point to be careful about — it's a trip that stays high throughout.
What Altitude Sickness Actually Feels Like
Acute Mountain Sickness (AMS) is your body's response to reduced oxygen at altitude, and it's genuinely common here — some sources studying the high-village loop above Kaza cite roughly one in four visitors experiencing some symptoms at that elevation.
Mild symptoms, which many travelers experience to some degree and which usually improve with rest and time, include headache, mild nausea, fatigue beyond what the day's activity would explain, loss of appetite, and difficulty sleeping.
Symptoms that mean stop and pay attention, rather than push through, include a worsening headache that doesn't respond to rest or hydration, persistent vomiting, noticeable shortness of breath even at rest, a sense of confusion or unusual clumsiness, and a cough that's new or productive.
Symptoms that mean descend immediately and seek medical help — these are signs of serious, potentially life-threatening altitude illness (HAPE or HACE) — include severe shortness of breath even at rest, a cough producing pink or frothy fluid, confusion or an altered mental state, difficulty walking in a straight line, or a severe headache with vomiting that doesn't improve. If you or a travel companion shows these signs, don't wait to see if it passes. Descend to lower altitude and get medical attention.
Why the Route You Choose Matters So Much Here
This is the single biggest factor within your control, and it's why we consistently recommend entering via Shimla-Kinnaur over Manali for a first Spiti trip, as covered in our route comparison guide.
The Shimla-Kinnaur route climbs in stages over two to three days, giving your body genuine time to adjust before you reach Kaza's elevation. The Manali route climbs from around 2,000 metres to over 4,500 metres at Kunzum Pass in a single day — exactly the kind of rapid ascent that most commonly triggers AMS. If you have a choice, enter slowly and exit fast, not the other way around.
The Acclimatization Rules That Actually Work
Build in a genuine rest day at Kaza before going higher. Not a light sightseeing day — an actual rest day, or at most gentle walking. This is the single highest-value thing you can do, and it's why our itinerary guide builds it in as a fixed day rather than an optional extra.
Climb high, sleep low, where you can. If your itinerary allows it, doing a high-altitude activity during the day and returning to sleep at a somewhat lower point helps your body adjust more gradually than sleeping at each new high point immediately.
Hydrate more than feels necessary. Dehydration compounds altitude symptoms and is easy to underestimate in the region's dry air.
Avoid alcohol and heavy sedatives for at least your first 24-48 hours at altitude. Both interfere with your body's natural acclimatization response and can mask early symptoms.
Eat lightly on your first day or two, favoring carbohydrates. Heavy, rich meals sit poorly at altitude for a lot of travelers.
Don't push straight from Kaza to the highest villages on day one. The Komic-Hikkim-Langza loop, sitting above 4,400 metres, is genuinely the highest-altitude day of a typical circuit — save it for after your Kaza rest day, not before.
Know your own history. If you've had AMS before at lower altitudes than Spiti, you're more likely to experience it again here, regardless of fitness level — altitude sickness isn't strongly correlated with physical fitness, which surprises a lot of travelers.
On Medication
Some travelers use acetazolamide (Diamox) as a preventive measure, starting it a day or so before ascending and continuing through the first days at altitude. This is a prescription decision between you and a doctor, ideally one familiar with altitude medicine, made well before your trip — not something to start figuring out once you're already in Kaza. If your doctor prescribes it, follow their guidance on timing and dosage rather than general trip-blog advice, including this one.
What to Do If Symptoms Show Up
Mild symptoms: stop ascending, rest, hydrate, and see if they improve over several hours. Don't go higher until they do.
Symptoms not improving, or worsening: descend to a lower altitude. This is the single most effective treatment for AMS, and it works faster than almost anything else you can do.
Severe symptoms (the ones listed above): descend immediately and seek medical attention. Kaza has basic medical facilities; more serious cases need evacuation to lower altitude and proper care. Don't wait it out hoping it resolves on its own.
For travel companions: know each other's baseline. Altitude sickness can include confusion that the affected person may not recognize in themselves — if a companion seems off, unusually confused, or is struggling more than the day's activity explains, take it seriously even if they insist they're fine.
Who Should Be Extra Cautious
Anyone with pre-existing heart or lung conditions, anyone pregnant, older travelers, and anyone who has had a serious altitude reaction before should talk to a doctor well before booking this trip, not after arriving in Kaza. This isn't meant to discourage — plenty of people in all these categories do this circuit successfully — but it's a conversation to have in advance with real medical guidance, not general travel advice.
Frequently Asked Questions
How high is Kaza, and is that dangerous?
Kaza sits at roughly 3,650 metres. It's not inherently dangerous, but it's high enough that altitude sickness is a real risk, which is why a rest day there before going higher is strongly recommended.
What is the highest point on the Spiti circuit?
Komic village, one of the highest motorable villages in the world, sits at roughly 4,587 metres. Kunzum Pass, if crossing via Manali, tops 4,500 metres as well.
How can I reduce my risk of altitude sickness in Spiti?
Enter via the Shimla-Kinnaur route for gradual acclimatization rather than the faster Manali route, build in a genuine rest day in Kaza before visiting higher villages, stay well hydrated, avoid alcohol in your first day or two, and don't rush the itinerary.
What should I do if I get altitude sickness in Spiti?
For mild symptoms, stop ascending, rest, and hydrate until they improve. For symptoms that worsen or don't improve, descend to lower altitude. For severe symptoms — confusion, severe breathlessness at rest, or a cough with pink or frothy fluid — descend immediately and seek medical attention.
Should I take Diamox for a Spiti trip?
Some travelers use acetazolamide (Diamox) preventively, but this should be discussed with a doctor before your trip, ideally one familiar with altitude medicine, rather than decided on the road.
