Altitude Sickness

What is altitude sickness?

Altitude sickness, also known as acute mountain sickness, can happen when you travel to high altitudes, usually above 3,000 metres. At these heights, there is less oxygen in the air, and your body may struggle to adjust.

Symptoms often start 6 to 24 hours after reaching a higher altitude. While altitude sickness is usually mild at first, it can become serious if symptoms are ignored or if you continue to climb.

Symptoms of altitude sickness

Common symptoms of altitude sickness include headache, dizziness, feeling lightheaded, nausea, and extreme tiredness. Some people also notice difficulty sleeping or a reduced appetite.

If you develop severe symptoms, such as shortness of breath at rest, a worsening headache that doesn’t improve, confusion, or problems walking steadily, you should descend immediately and seek medical help.

How to reduce the risk of altitude sickness

The most effective way to reduce the risk of altitude sickness is to ascend slowly. Try not to increase your sleeping altitude by more than 500 metres per day, and plan a rest day every three to four days.

Staying well hydrated is important. Drink plenty of water and avoid excess alcohol. If you develop a headache, avoid climbing higher. Pain relief such as paracetamol or ibuprofen may help with mild symptoms.

If symptoms don’t improve within 24 hours, it’s important to descend by at least 500 metres until you feel better.

Altitude sickness treatment and prevention

For some travellers, altitude sickness medication may help reduce the risk of symptoms or support acclimatisation. Treatment suitability depends on your destination, health, and travel plans.