Many travellers from Singapore visit high mountain destinations such as Nepal, Tibet, Bhutan, Peru, and parts of China or India12. These locations are at high altitude where oxygen levels are lower1. Because Singapore is at sea level, our bodies are not used to such environments. Understanding altitude sickness is important before travelling.
Altitude Sickness: Symptoms, Prevention, and Safe Travel Advice
#altitude #acclimatization #medication #trekking
What Is Altitude Sickness?
Altitude sickness occurs when the body is unable to adapt to lower oxygen levels at high elevation1. As altitude increases, the air becomes thinner and contains less oxygen1. The body requires time to adjust through a process known as acclimatisation1.
If this adjustment does not occur adequately, symptoms may develop. This condition can affect anyone regardless of age or fitness1.
Symptoms of Altitude Sickness
Common early symptoms include headache, dizziness, nausea, fatigue, and poor sleep13. Symptoms often appear within a few hours to one day after arrival at high altitude1.
More severe symptoms include confusion, difficulty walking, breathlessness at rest, or chest discomfort14. These signs require urgent medical attention.
Why Singapore Travellers Are at Higher Risk
Individuals living at sea level are less adapted to low-oxygen environments2. Rapid travel to high altitude locations increases the likelihood of symptoms12. Examples include Kathmandu, Lhasa, and Cusco.
How to Prevent Altitude Sickness
- Gradual ascent is the most important preventive measure1
- Increase sleeping elevation slowly and allow time for acclimatisation1
- Stay well hydrated and avoid excessive exertion during the first few days2
- Avoid alcohol and smoking, which may worsen symptoms1
- Listen to your body and rest if symptoms appear
Medical Advice Before Travel
Travellers may wish to seek medical advice before travelling to high altitude destinations. A doctor can assess individual risk factors such as past history, itinerary, and planned activities13. Recommendations are personalised and based on clinical assessment.
When to Seek Medical Attention
Seek medical advice if symptoms are persistent, worsening, or affecting daily function1. Urgent care is required if there is severe headache, confusion, breathlessness at rest, or difficulty walking14. Descending to a lower altitude is often necessary if symptoms worsen1.
Final Advice
Altitude sickness is common but manageable with proper preparation1. Understanding symptoms, planning gradual ascent, and recognising warning signs are key. This article is for educational purposes only and does not constitute medical advice. Consult a licensed doctor for personalised assessment before travel if needed.
References
- Luks AM, et al. Wilderness Medical Society Clinical Practice Guidelines. Wilderness & Environmental Medicine. 2024.
- CDC Yellow Book. High-Altitude Travel and Altitude Illness. 2025.
- Derstine M, et al. JAMA Clinical Guidelines Synopsis. 2024.
- Hackett PH, Roach RC. High-Altitude Illness. NEJM. 2001.