Understanding an Asthma Attack

See how asthma causes inflammation in the smooth muscle cells in the bronchioles, making your airways dangerously narrow.

See how, during an asthma attack, the airways in your bronchiole (which are tubes leading to the lungs) can quickly become filled with mucus.

On any given day, you are probably inhaling much more than just air. See how your body responds to potential allergens or irritants.

In a person with asthma, the histamines overreact, producing far more mucus than is needed. See how this mucus is made.

Asthma leads to unnecessary and often chronic inflammation that can damage airways permanently if left untreated. Read more.