Health condition
Altitude and lung conditions
Altitude thins the air meaningfully above about 2,500 metres - and for people with asthma, COPD, pulmonary hypertension or past pneumothorax, trekking and high-altitude travel deserve a pre-trip respiratory review and a written plan.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Everyone at altitude risks acute mountain sickness: headache, nausea and fatigue from about 2,500m, prevented by ascending gradually (300-500m of sleeping altitude per day above 2,500m) and treated by stopping or descending
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Asthma is generally altitude-compatible with good control and a solid action plan; cold dry air is the main trigger to manage
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COPD, pulmonary hypertension and recent pneumothorax need individual specialist assessment - some situations preclude high altitude
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Specialist: a consultant respiratory physician for fitness-to-travel assessment; acetazolamide has a role in prevention for higher-risk itineraries
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
With ascent, each breath contains progressively less oxygen, and the body's compensations - faster breathing, higher heart rate, and over days, more red cells - take time: the cardinal rule of high places is gradualism, because acute mountain sickness spares neither the fit nor the young when ascent outpaces acclimatisation, and its severe forms (fluid on the brain or lungs) are emergencies whose treatment is descent. Lung disease recalibrates the equation: asthmatics generally travel well - altitude air is low in allergens - provided control is good and the cold-air trigger is respected, while COPD patients start closer to the oxygen cliff-edge, and conditions like pulmonary hypertension can deteriorate dangerously as low oxygen constricts lung blood vessels further.
Diagnosis and treatment routes
A pre-travel respiratory assessment matches the traveller to the itinerary: reviewing recent control and exacerbations, lung function and oxygen levels, and for marginal cases using hypoxic challenge testing - breathing a reduced-oxygen mixture that simulates altitude - to predict who will need supplemental oxygen or should reconsider. The output is a plan: optimised regular treatment, a written escalation pathway with standby medication, acclimatisation-conscious route design, acetazolamide prophylaxis where appropriate, and unambiguous rules for descent. Recent pneumothorax deserves its own caution given remote settings, and travel insurance disclosing lung conditions is not optional paperwork but part of the safety system. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant respiratory physician. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Altitude and lung conditions.
Quick, plain-English answers to what people ask us most.
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How does altitude affect people with lung conditions?
At higher altitudes, lower oxygen levels in the air can worsen symptoms for people with existing lung conditions such as COPD, asthma, or pulmonary fibrosis, as their lungs already have reduced capacity to compensate.
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What causes breathing difficulty at altitude for people with lung disease?
Reduced atmospheric oxygen at altitude means less oxygen is available with each breath, and people with compromised lung function have less reserve capacity to adapt, leading to worsened breathlessness.
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What are the symptoms of altitude-related breathing difficulty?
Symptoms include increased breathlessness beyond what's usual, fatigue, headache, and in more significant cases, symptoms of altitude sickness such as nausea and dizziness.
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Is travelling to altitude dangerous for people with lung conditions?
It can be, particularly for those with more severe underlying lung disease, so pre-travel assessment and planning, including possible supplemental oxygen, is often recommended for higher-risk individuals.
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Can altitude-related breathing problems be prevented?
Gradual ascent, avoiding overexertion at altitude, ensuring optimal control of the underlying lung condition before travel, and arranging supplemental oxygen if recommended can all help reduce risk.
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How is altitude risk assessed for people with lung conditions?
Specialists can use tests such as a hypoxic challenge test to simulate altitude conditions and predict how someone's oxygen levels might respond, informing recommendations about travel and oxygen use.
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How long does it take to adjust to altitude?
Some acclimatisation occurs over several days at altitude, but people with significant lung disease may continue to have reduced oxygen levels throughout their stay rather than fully adapting.
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Altitude effects vs typical exacerbation of lung disease — what's the difference?
A typical exacerbation is usually triggered by infection or other illness and can occur at any altitude, while altitude-related symptoms are specifically triggered by reduced oxygen availability at height and generally improve on returning to lower altitude.
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Should I get medical advice before travelling to altitude with a lung condition?
Yes, especially with moderate to severe lung disease, pre-travel assessment can identify your individual risk and any need for supplemental oxygen or medication adjustment during travel.
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When should I seek advice about altitude travel with a lung condition, and how quickly can I be seen privately?
Seek advice several weeks before travel to allow time for assessment and planning. NHS respiratory referral can take some weeks, while private specialist or travel health assessment is often available within about one to two weeks.