You may not think of asthma as a killer disease. Yet nearly 500,000 Americans are hospitalized annually and more than 5,000 die annually of asthma.

Asthma is a chronic condition that occurs when the main air passages of your lungs, the bronchial tubes, become inflamed. The muscles of the bronchial walls tighten and extra mucus is produced, causing your airways to narrow. This can lead to everything from minor wheezing to severe difficulty in breathing. In some cases your breathing may be so labored that an asthma attack becomes life-threatening.

Yet asthma is a treatable disease, and most flare-ups and deaths can be prevented. In the past 20 years, scientists have gained a better understanding of asthma's cause. New drugs have been developed to replace standard medications. Greater emphasis also is now put on managing your own condition, much as people manage their diabetes with insulin. Together, you and your doctor can work to gain control over your symptoms, reduce the risk of severe attacks and help maintain a normal life.


Mechanism of asthma
Mechanism of asthma In asthma, airways in your lungs are inflamed and swollen. Muscles ...