Mountain holidays can be wonderful for families, whether you are skiing in the Rockies, hiking in the Andes or exploring a high national park. They can also bring an unexpected health concern: altitude sickness. Children may become unwell before parents realise that the change in elevation is responsible.
For Australian families, this issue often arises when travelling overseas. Most popular local alpine destinations, including Perisher, Thredbo and Mount Buller, are high enough for cold-weather safety concerns but generally sit below the elevations where altitude illness becomes common. A trip to Colorado, Nepal or Peru can involve a much faster and larger change.
Knowing the warning signs, allowing time to acclimatise and having a sensible response plan can make a mountain trip safer. This guide explains what parents should watch for, when to descend and when to seek urgent medical care.
Altitude sickness, also called acute mountain sickness, happens when the body has not adapted to reduced oxygen levels. It is most likely above about 2,500 metres, although some people develop symptoms at lower elevations or after a rapid ascent. Fitness does not guarantee protection, and a child who coped well on a previous holiday may feel different on another trip.
Children can experience headache, nausea, poor appetite, dizziness, tiredness and disturbed sleep. Younger children may simply become clingy, irritable or unusually quiet. A toddler who cannot explain a headache may cry when standing, refuse food or want to be carried.
These signs can resemble jet lag, dehydration, motion sickness or a virus. The timing is important: symptoms that begin several hours after arriving at altitude, particularly after sleeping high, deserve attention. A child with asthma, heart disease, lung disease or another chronic condition should have an individual travel plan from their doctor before departure.
Book a pre-travel appointment with your GP or a travel medicine clinic several weeks before the trip. Discuss the route, sleeping elevations, planned activities, existing medical conditions and any regular medicines. Healthdirect and the Australian Government’s Smartraveller service provide useful general advice, but they do not replace personalised medical assessment.
Ask the doctor whether your child needs a prescription medicine such as acetazolamide. It is not suitable for every child and should never be borrowed from another traveller or started without professional advice. Pack a written list of medicines, allergies, emergency contacts and insurance details, along with a small first-aid kit.
Plan the first day around rest rather than achievement. A family flying from Sydney, Melbourne, Brisbane or Perth into a high-altitude city should avoid scheduling a strenuous hike immediately after landing. If you are joining a tour, check whether the itinerary allows gradual ascent and whether guides have a clear emergency procedure for children.
The mild form of altitude illness usually starts with headache plus one or more symptoms such as nausea, dizziness, fatigue or loss of appetite. A child may stop joining games, complain that their legs feel heavy or fall asleep at an unusual time. Sleep can be unsettled, but repeated waking combined with headache or vomiting should not be dismissed as ordinary travel fatigue.
Check your child regularly during the first 24 hours after reaching a higher elevation and after each major ascent. Offer ordinary meals and small, regular drinks, but do not force excessive water. Clear urine is not a requirement, and overhydration can be dangerous. Avoid alcohol for adults supervising children, as it can make judgement and dehydration worse.
A simple note on your phone can help you track the time of arrival, sleeping altitude, symptoms, food, fluids and medicines. This is especially useful when moving between lodges or national parks. If several family members feel ill, consider shared causes such as food poisoning, carbon monoxide exposure or a contagious infection rather than assuming altitude is the only explanation.
Stop climbing if your child develops possible altitude sickness. Rest at the same elevation, keep them warm and supervise closely. Do not allow them to ski, hike or play energetically while symptoms continue. If the headache or nausea is mild and improves after rest, seek advice from a local doctor or mountain clinic before ascending again.
Descent is the most important treatment when symptoms worsen or fail to improve. A drop of at least 500 to 1,000 metres may be advised, but the exact decision depends on the child’s condition, location and available medical care. Do not leave a sick child alone while another adult goes for help; use the resort’s patrol, guide service or emergency team.
Emergency warning signs include confusion, difficulty walking normally, extreme drowsiness, fainting, breathlessness while resting, blue or grey lips, a persistent cough, frothy sputum, chest tightness or repeated vomiting. These may indicate severe altitude illness affecting the brain or lungs. Call local emergency services immediately, arrange urgent descent and follow professional instructions. In Australia, call 000; overseas, use the local emergency number and your travel insurer’s assistance line.
A gradual itinerary is easier on children than a packed schedule. Spend the first night at a lower elevation where possible, then increase sleeping altitude slowly. Build in quiet afternoons, warm clothing, sunscreen and frequent toilet breaks. Cold, dry mountain air can increase fluid loss, while strong ultraviolet exposure can cause sunburn even on cloudy days or reflected snow.
Food should be familiar and easy to eat. Pack muesli bars, crackers, fruit pouches or other snacks your child already tolerates instead of relying entirely on unfamiliar resort meals. Australian families used to grabbing supplies at a Coles or Woolworths before a road trip may find that high-altitude villages have smaller shops and higher prices, so carry essentials without overpacking.
Long transfers can also exhaust children before they reach the mountains. These scenic drive games can make a lengthy journey calmer and give everyone a mental break before arrival. Keep screen time, audiobooks and simple activities available, especially when a flight is followed by a winding road.
A child who feels well at the hotel may become unwell on a steep trail or during a full day of skiing. Begin with short, low-intensity activities and return before fatigue becomes severe. Use a child carrier only when an adult can monitor breathing, temperature and behaviour closely. Do not confuse a quiet child resting in a carrier with a child who is unusually lethargic.
Ask accommodation staff, ski schools and park rangers about current conditions, evacuation routes and nearby medical services. In places such as Yellowstone or Grand Teton, distance and weather can make rescue slower than families expect. In overseas resorts, learn the local terms for medical clinic, emergency descent and oxygen, while remembering that supplemental oxygen is a temporary support rather than a substitute for descending.
Families visiting Australia’s Snowy Mountains during July school holidays should still prepare for ordinary mountain risks, including hypothermia, sun exposure, falls and road closures. At lower local elevations, altitude sickness is less likely, so severe symptoms should prompt consideration of other causes. A medical professional can help distinguish altitude illness from influenza, gastroenteritis, concussion or an allergic reaction.
| Situation | What parents may notice | Sensible response |
|---|---|---|
| Mild early symptoms | Headache, reduced appetite, nausea, tiredness or poor sleep | Stop ascent, rest, monitor closely and seek medical advice |
| Symptoms continuing or worsening | Increasing headache, vomiting, unsteady walking or marked fatigue | Arrange prompt medical assessment and prepare to descend |
| Severe altitude illness | Confusion, inability to walk, breathlessness at rest, blue lips or fainting | Call emergency services, begin urgent descent with professional support |
| Symptoms at modest altitude | Fever, diarrhoea, rash, injury or symptoms affecting several people | Consider infection, injury or another cause and obtain medical care |
A mountain holiday does not need to be cancelled because your family is travelling with children. Careful pacing, realistic activity plans and early action reduce the chance that a small problem becomes an emergency. Save this guide with your travel documents, discuss the warning signs with every supervising adult and seek professional advice before setting off for a high-altitude destination.