Some asthma sufferers have tightness or pain in the chest. They say it feels as if someone is sitting on them.
When asthma is most severe, the person may have extreme difficulty breathing. The disease can severely limit a person's activity, and even lead to death.
VOICE ONE:
Doctors do not know what causes asthma. Researchers believe a combination of environmental and genetic conditions may be responsible.
Forty percent of children who have parents with asthma will develop the disease. Seventy percent of people with asthma also have allergies. Allergies are unusual reactions of the body's immune system to otherwise harmless substances or conditions.
Doctors have identified many of the things that may trigger, or start, an asthma attack. Triggers are things that cause the asthma sufferer's airways to swell.
Different asthma patients usually have different triggers. Allergens are one of the most common triggers. These impurities in the air cause allergic reactions.
Some of the more common allergens include animal hair, dust, mold and pollen.
VOICE TWO:
Pollen is a fine dust that comes from grass, trees and flowers. Mold is a kind of fungus. It can grow on the walls or floors of homes. It is often in wet or damp areas like bathrooms, kitchens and basements. The Environmental Protection Agency estimates that twenty-one percent of asthma cases in the United States have links to mold and dampness in homes.
最新
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25