Whether you're climbing or just visiting high-altitude destinations, precautions to prevent acute mountain sickness are worthwhile.
High-altitude illness encompasses a range of physical problems due to the effects of lowered partial pressure of oxygen with travel to high altitude.
Problems can vary from decreased exercise performance to acute mountain sickness and its complications.
The likelihood of symptoms and their severity increases progressively with altitudes above 1500m.
Travellers at risk
Travellers most at risk of developing mountain sickness are the unacclimatised, the young and those living at low altitudes, but there is considerable individual variation in susceptibility.
As well as trekkers in the Himalayas, or those climbing Mount Kilimanjaro, another group of travellers who can be affected by altitude are those going to high-altitude