Indian Treks
High-altitude safety
AltitudeSicknessGuide
Understand AMS, recognise early signs, prevent problems with smart pacing, and know exactly what to do — because the right response at altitude is simple, decisive, and often just: go down.
What altitude sickness is
As you gain elevation, air pressure drops and each breath delivers less oxygen. Your body needs time to adapt. When ascent outpaces adaptation, you can develop Acute Mountain Sickness (AMS) — and in rarer cases, more serious forms that affect the brain or lungs.
Fitness helps you hike, but it does not make you immune. Strong athletes get AMS. Slow, honest pacing and early reporting protect you better than ego.
Know the signs — early vs serious
Tell your trek leader at the first persistent symptoms. Early honesty prevents emergencies.
Common AMS signs
- Headache that does not ease with rest/hydration
- Nausea or loss of appetite
- Unusual fatigue or weakness
- Dizziness or light-headedness
- Poor sleep / restless night at new altitude
Emergency red flags
- Severe headache + confusion or clumsiness
- Vomiting that prevents hydration
- Shortness of breath at rest
- Tight chest, persistent cough, frothy sputum
- Inability to walk straight (ataxia)
Prevention that works on real treks
Ascend gradually
Follow the itinerary’s acclimatisation days. “Climb high, sleep low” when the route allows. Do not skip rest days to “save time.”
Pace like a local
Use a slow, sustainable rhythm. If you cannot speak a short sentence, you are going too fast. Poles help regulate effort on climbs.
Hydrate & eat
Drink regularly even if you are not thirsty. Keep taking snacks — appetite often dips at altitude, but empty fuel tanks worsen symptoms.
Sleep & substances
Protect sleep. Avoid alcohol and sleeping tablets that suppress breathing. Quit smoking before the trip if you can.
Listen & report
Share headaches, nausea, or weird fatigue immediately. Leaders would rather adjust pace than evacuate later.
What to do if symptoms start
The single most effective treatment for AMS is descent. Medicines and oxygen can support, but they are not a green light to climb higher while sick.
| Situation | Action |
|---|---|
| Mild headache after a big gain day | Rest, hydrate, light snack, tell the leader; reassess in a few hours |
| AMS symptoms that persist or worsen | Do not go higher; rest at current altitude or descend as advised |
| Symptoms at night / poor coordination | Wake the leader; prepare to descend — do not wait for morning ego debates |
| Breathing trouble at rest or confusion | Emergency descent + oxygen/medical protocol; evacuate as directed |
About Diamox (acetazolamide)
Some doctors prescribe Diamox to aid acclimatisation for susceptible travellers. It is not a substitute for slow ascent, and it is not harmless for everyone.
Only take it if a qualified doctor recommends it for you. Discuss side effects (tingling, taste changes, increased urination), sulfa allergies, pregnancy, and kidney issues before the trip — not on the trail.
Who should be extra careful
- Anyone with previous AMS on a similar altitude profile
- Travellers flying directly to high cities then trekking immediately
- People with heart, lung, or blood-pressure conditions (get clearance)
- Those recovering from infection, anaemia, or poor sleep debt
- Anyone tempted to hide symptoms to “not delay the group”
How Indian Treks supports you at altitude
- Leaders trained in wilderness first aid and high-altitude awareness
- Itineraries with conservative gains and acclimatisation where needed
- Pulse oximeter checks and supplemental oxygen on relevant routes
- Clear briefings on symptoms, water, and pace from day one
- Authority to turn around or descend when safety requires it