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Altitude sickness affects 10 to 25 percent of visitors above 3000 metres in the Alps, especially during rapid cable car rides, ski trips in glacier areas or high alpine hut-to-hut tours. Slow acclimatisation, drinking enough and avoiding alcohol are the most important steps to prevent symptoms. In this article you will discover how to recognise the signs of altitude sickness and what you can do to keep your Alps holidays safe and comfortable.
What altitude sickness is and when it occurs
Altitude sickness develops when your body is given too little time to adjust to the lower oxygen pressure at altitude. In the Alps this mainly becomes a risk above 2500 metres. The most common form is acute altitude sickness, in which symptoms such as headache, nausea, dizziness and fatigue occur within a few hours to a day after arrival at altitude.
More serious forms, such as fluid in the lungs or cerebral oedema, are rare but require immediate descent and medical help. The risk increases with rapid ascent, dehydration, alcohol consumption and heavy exertion shortly after arrival. Individual susceptibility also plays a role.
Recognising signs of altitude sickness in the Alps
Symptoms do not always appear immediately and can range from mild to severe. It is important that you recognise the signals before they get worse.
Common symptoms are:
- Headache, often starting at the end of the day or at night
- Nausea and loss of appetite
- Dizziness and mild confusion
- Fatigue, even after rest
- Shortness of breath during light exertion
- Sleep problems or restlessness at night
With severe symptoms such as extreme shortness of breath, coughing up froth, or serious coordination problems, immediate descent is essential. In 90 percent of milder cases, symptoms disappear by sleeping lower and taking extra rest.
Acclimatising while hiking in the Alps
Gradual adaptation to altitude is the best prevention. Your body needs time to produce more red blood cells and to use oxygen more efficiently. Rushing increases the risk of symptoms considerably.
Follow these acclimatisation steps for a safe mountain holiday:
- First spend two nights at 1500 to 2500 metres before going higher
- Above 3000 metres, increase your sleeping altitude by a maximum of 300 to 500 metres per night
- Take a rest day at the same altitude every three to four days
- Apply the ‘climb high, sleep low’ principle: climb higher during the day, but sleep lower so your body can adapt
- Plan routes in stages, for example starting in a valley at 1500 metres with day hikes to higher areas
This approach also works for less well-trained travellers. Hikers report on forums that hut-to-hut treks without acclimatisation often lead to night-time headaches, but that a gradual build-up and the ‘climb high, sleep low’ principle prevent symptoms.
Hydration and nutrition at altitude
At altitude you lose fluid more quickly due to dry air and faster breathing. Dehydration worsens symptoms of altitude sickness and reduces your ability to acclimatise.
Pay attention to the following:
- Drink at least three litres of water per day; your urine should remain light in colour
- Choose carbohydrate-rich foods such as muesli bars, dried fruit or pasta for steady energy
- Avoid alcohol, as it speeds up dehydration and worsens oxygen uptake
- Do not use sleeping tablets; they can suppress breathing
Beetroot juice can help naturally to improve oxygen uptake. Experience shows that some hikers find this supportive, although it is no substitute for proper hydration.
Medicines and medical preparation against altitude sickness
In the presence of risk factors or rapid ascent, for example after a flight to a high-altitude ski resort, you can consider medication. Acetazolamide (Diamox) is the most commonly prescribed drug and helps your body acclimatise faster by stimulating breathing.
Discuss this with a doctor beforehand, especially if you have:
- Existing heart or lung conditions
- Previous experiences with altitude sickness
- Rapid ascent to more than 3000 metres without acclimatisation
- Planned overnight stays above 3500 metres
Paracetamol helps against headaches, but only masks symptoms. It does not solve the underlying cause. Pack enough medicines for your trip and take a first aid kit with painkillers and any prescribed medication.
Practical tips for different situations in the Alps
The level of risk depends on the altitude, the speed of ascent and the duration of your stay. Adapt your preparation to your specific situation.
| Situation in the Alps | Recommended approach |
|---|---|
| Day hikes above 3000 metres from the valley | Low risk; hydrate well and build up exertion gradually |
| Hut-to-hut trek above 3000 metres | Acclimatise two to three days in advance; increase sleeping altitude by a maximum of 500 metres per night |
| Glacier skiing above 2500 metres | Plan in stages and take it easy for the first few days |
For multi-day tours such as to Mont Blanc or Grossglockner it is wise to choose routes with intermediate huts at 2000 to 2500 metres. This gives your body the chance to adapt gradually. Keep your schedule flexible so that you can add an extra rest day if you notice early warning signs.
What to do if you develop symptoms en route
If you recognise symptoms of altitude sickness during your hike or stay, take action immediately. Early intervention prevents them from getting worse.
Follow these steps:
- Stop climbing and rest at the same altitude
- Drink extra water and eat carbohydrate-rich snacks
- Take paracetamol for headache if needed
- If symptoms do not improve within a few hours, descend at least 300 to 500 metres
- Sleep lower than the place where you developed symptoms
Do not ignore the signals and do not go higher until you have fully recovered. Avoid heavy exertion until the symptoms have gone. With severe symptoms such as extreme shortness of breath or confusion, seek medical help immediately and descend as quickly as possible.
Preparing for a safe trip to the Alps
Good preparation starts at home. Check your health in advance, especially if you have existing conditions. Discuss with your GP whether you are fit for high alpine activities and whether medication such as Diamox is useful.
Make sure you take the following items with you:
- Enough water and high-capacity water bottles
- Carbohydrate-rich snacks and energy bars
- Paracetamol or other painkillers
- Any prescribed medication such as Diamox
- First aid kit with basic medical supplies
Plan your route so that you can acclimatise. Start in valleys such as Tyrol or Swiss mountain villages around 1500 metres and build up gradually. Choose routes with several intermediate huts and avoid rapid ascents by cable car without prior adaptation. Stress can intensify symptoms, so allow plenty of time and leave room for changes.
On the Traveler Tips website you will find more practical information about routes, preparation and destinations in the Alps. Discover how to plan your mountain holiday smartly and which regions best suit your wishes.
Frequently asked questions
Plan your route so that you gain altitude gradually: first spend the night at around 1500–2000 metres and only come above 2500–3000 metres after a few days. Avoid stages where you drive from the valley to a high altitude in one day and then stay there straight away; it is better to make stopovers and sleep lower than your highest point (‘climb high, sleep low’). Build space into your daily schedule for extra breaks, drinking enough and possibly a rest day if someone develops headache, nausea or dizziness. Keep your travel plan flexible so that you can always choose an alternative with a lower pass or valley route if symptoms arise.
Plan your route so that you ascend gradually, preferably with one or two nights at medium altitude (1500–2500 m) before you sleep above 2500–3000 m. Drink plenty of water on the way, eat regularly (preferably carbohydrate-rich) and avoid alcohol and sleeping tablets. Go easy on yourself in the first few days: take breaks, do not drive straight to the highest point to stay overnight there, and keep your schedule flexible so that you can sleep lower if symptoms occur. Watch out for early signs such as headache, dizziness or nausea and descend straight away (a few hundred metres is often enough) if these do not quickly disappear.
Yes, there are clear acclimatisation strategies: first sleep 1–2 nights at 1500–2500 metres and limit the increase in sleeping altitude above 3000 metres to about 300–500 metres per night, with a rest day every 3–4 days. Follow the ‘climb high, sleep low’ principle: climb higher during the day but spend the night lower. Choose Alpine routes with intermediate huts around 2000–2500 metres, so that you can ascend in stages. Combine this with drinking enough, light exertion in the first few days and avoiding alcohol and sleeping tablets.
Early symptoms of altitude sickness usually include a dull headache, nausea, dizziness, insomnia and unusual fatigue a few hours to a day after arriving at higher altitude. Take these signals seriously: stop ascending, rest, drink plenty of water, eat lightly and avoid alcohol and heavy exertion. If the symptoms do not clearly lessen within a few hours or get worse (for example severe headache, shortness of breath at rest, confusion), you must descend to a lower sleeping altitude. By increasing altitude slowly, applying ‘climb high, sleep low’ and scheduling rest days, you can usually continue your journey comfortably and safely.
Essential are good hydration (at least 3 litres per day, urine light in colour) and carbohydrate-rich food such as muesli bars and dried fruit to maintain sufficient energy. Avoid alcohol and sleeping tablets, as these disrupt breathing and acclimatisation. Take simple pain relief such as paracetamol with you for headaches. In consultation with a doctor, consider preventive medication such as Diamox if you have known risk factors or will be ascending quickly.
