Altitude sickness is a real and common concern for trekkers in Nepal, especially on routes that go above 2,500 meters. It can affect anyone, regardless of age, fitness level, or previous trekking experience. Most cases are mild, but severe altitude sickness can become dangerous if ignored.
Common early symptoms include headache, nausea, dizziness, fatigue, and loss of appetite. These symptoms usually appear when the body does not have enough time to adjust to reduced oxygen levels. The most effective way to prevent altitude sickness is slow and gradual ascent, allowing time for acclimatization. Many trekking itineraries include rest or acclimatization days for this reason.
Other important prevention measures include staying well hydrated, avoiding alcohol, eating regularly, and listening to your body. Trekking at a comfortable pace rather than rushing to higher altitudes helps significantly. Some trekkers also carry medication such as acetazolamide (Diamox), but this should only be used with proper understanding and, ideally, medical advice.
The golden rule in Nepal trekking is: if symptoms worsen, do not go higher. Descending is the most effective treatment. Guides are trained to recognize altitude sickness and respond appropriately, which is another reason many travellers choose to trek with professional support.
Have you experienced altitude sickness while trekking, and what helped you manage it?
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