What is Asthma

Asthma is a disease affecting the airways that carry air to and from your lungs. People who suffer from this chronic condition (long-lasting or recurrent) are said to be asthmatic.

The inside walls of an asthmatic's airways are swollen or inflamed. This swelling or inflammation makes the airways extremely sensitive to irritations and increases your susceptibility to an allergic reaction.

Asthma is a condition that affects the air passages of the lungs. It is a two-step problem:

1. When a person has asthma, the air passages are inflamed, which means that the airways are red and swollen.
2. Inflammation of the air passages makes them over extra-sensitive to a number of different things that can "trigger," or bring on, asthma symptoms.

During breathing, air is normally brought in through the nose where it is warmed, filtered, and humidified. It then passes through the throat and into the windpipe, called the trachea (TRAY-kee-a). The trachea divides into two large tubes called the right bronchus (BRONG-kus) and left bronchus. These then split up into much smaller tubes, which in turn branch into thousands of very small airways called bronchioles (BRONG-kee-olz). It is the large and small bronchi that are generally affected in asthma.





When a person is exposed to one of these irritants, or triggers, the oversensitive air passages react by becoming narrower, swollen, and even more inflamed. This obstructs airflow to and from the lungs and makes it very difficult for the person to breathe.

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