High altitude: Altitude sickness occurs at high altitude. So what is high altitude?
Altitude is defined on the following scale:
Most people can go up to 8,000 feet (2,438 meters) with minimal effects. If you have been at that altitude before and had no problems, you can probably return to that altitude without problems if (and only if) you are properly acclimatized.
If you have not been to high altitude before, caution is strongly recommended. No specific factors such as age, sex, or physical condition are known to correlate with the susceptibility to altitude sickness. Some people are simply more susceptible than others. There is no telling, so caution is the better part of wisdom.
An even more serious problem is high-altitude cerebral oedema due to leakage of fluid into the brain tissues. Again, descent is by far the best treatment.
Lockheed Martin information on the High Altitude Airship (HAA) lighter-than-air vehicle
The High Altitude Medicine Guide. These web pages provide information about altitude illness and other health issues affecting travellers to high mountainous ...
These pages show the latest things happening at our Institute which is part of Clinica IPPA created in July 1970, located in the city of La Paz, Bolivia (3510 m).
Outdoor Action Guide to High Altitude: Acclimatization and Illnesses by Rick Curtis, Director, Outdoor Action Program. Last Page update 07/07/1999