If you have asthma and you enjoy outside activities that take you to
higher elevations or much, much higher, the possible danger has
certainly crossed your mind. Well, the news isn't all bad, though it
is cautionary.
Asthma is a chronic lung condition, characterized by a difficulty with
breathing. People with asthma have extra sensitive or hyper-responsive
airways. During an asthma attack, their airways become irritated and
react by narrowing and constructing, causing increased resistance to
airflow, and obstructing the flow of the air passages to and from the
lungs.
There's no question, as an asthma sufferer you're more likely to be
affected by altitude sickness than if you didn't have the disease.
However, if you're fit and healthy, with asthma that's well
controlled, you should have no problems coping. This is, of course,
provided you ascend slowly and recognize and accept your limitations.
Altitude will generally have little effect on stable asthmatics.
If your asthma is so severe that your blood oxygen is low, then air
travel can put you in danger of reducing your blood oxygen level even
further. That, combined with the dry, cool conditions generally
encountered at high altitudes, could trigger asthma symptoms. In
addition, if your destination is a high altitude, a city such as
Denver for example, and you're unaccustomed to that altitude and have
little opportunity to acclimatize, you may experience heightened
symptoms. As always, discuss this with your doctor ahead of time....

Natural Asthma Treatment: http://groups.google.com/group/asthmacvh