Asthma
Asthma is a condition that causes the airways in your lungs to be inflamed and very sensitive. When airways are inflamed, they start to swell. Every time you breathe, pollens, dust, germs, chemicals, animal dander and tobacco smoke can enter your body. All the different things you breathe can affect your lungs, especially if you have asthma. When you airways become irritated, there's less space for air to move in and out of your lungs. you may be short of breath or feel as if you cannot get a full breath of air. When your asthma is controlled, your airways are a little inflamed, but you can breathe easily. Muscles on the outside of the airways are relaxed and the lining inside the airways makes a small amount of mucus. This helps trap irritants so you can cough them out.
When you come in contact with a trigger, your airway becomes more inflamed. The tiny muscles outside the airway tighten and the lining inside produces more mucus. This clogs the narrow space in the airway making it more difficult to breathe.
When airways are inflamed, they are even more sensitive than normal. If continued exposure to triggers, the muscles continue to tighten and production of mucus increases. The airways continue to swell and the asthma is out of control. This is what most people call an asthma attack or flare-up. At this point action must be taken because this can progress to a life threatening condition

Uncontrolled asthma can lead to problems including: missed days from work, limitation of activities and can be life threatening requiring emergency medical care.
Asthma is a condition that can be managed with correct medications, trigger avoidance and an action plan for management. Self management skills are an important part of successful asthma management. (learn more... )
Triggers
For people with asthma, chemicals, odors, animal dander, smoke and physical activity can irritate the lungs. These things are called triggers because they trigger changes in the lungs. Sometimes triggers cause airways to tighten, swell and produce mucus. These are all signs that asthma is out of control.
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