Several members of the celebrity group suffered from altitude sickness during the five-day ascent.
Altitude sickness can be easily treated by descending immediately and allowing your body to acclimatise slowly.
Rescuers have been hampered by freezing weather, altitude sickness and risks of further landslides.
Most people who live near sea level experience mild altitude sickness starting at about 5, 000 feet.
Afflicted by altitude sickness, Glaisher experienced elation, followed by blindness and paralysis, and passed out.
Conversely, several heart-failure medicines are now in use to treat altitude sickness or help with acclimatization, researchers say.
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Workers operate machinery from inside pressurized cabins or inhale from oxygen canisters to stave off the worst effects of altitude sickness.
Bouts of malaria and altitude sickness slowed the journey as he travelled illegally through east Tibet and over the Himalayas to India.
Similar devices are often used in hospitals, but the consumer version is aimed at aviators, high-impact athletes and those susceptible to altitude sickness.
On top of that, altitude sickness generally kicks in around 8, 000 feet setting up house anywhere higher is pretty much relegating yourself to a semi-permanent hangover.
Symptoms of so-called acute altitude sickness, which are not life-threatening, include: mild headache, shortness of breath during ordinary activities, loss of appetite, insomnia and malaise.
Monks, unfettered by the altitude sickness suffered by many of the emergency workers sent from other parts of China, made valiant contributions to the rescue.
The climbers at Base Camp are usually well acclimatised and know how to avoid altitude sickness, which is caused by moving to high altitude too quickly.
Worsley, who came on as a second-half replacement at Twickenham, joked that Lewsey "may have had altitude sickness or something" - a reference to his training for Everest.
These trekking groups are often on a tight itinerary and may ignore the early symptoms of altitude sickness - headaches, loss of appetite - or may simply hide them because of peer pressure.
One of those mistakes people make is to rationalize their symptoms for example, to write off the hung-over feeling commonly associated with altitude sickness to jet lag (or an alcohol-related hangover), says J.
The air pressure is also now closer to what is normal in Denver, Colorado -- the mile-high city at 5, 280ft -- than the traditionally higher, and more mountaintop-like standard of 8, 000ft above sea level, sparing fliers from the mild altitude sickness that can be experienced when flying a long distance.
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