Understand the Cause of Allergic Asthma

Most cases of asthma involve an allergy. Like nonallergic asthma, symptoms include coughing, wheezing, shortness of breath and chest tightness. But with allergic asthma, these symptoms are brought on by breathing allergens, substances that trigger an allergic reaction. Common allergens include pollens, molds, animal dander, dust mites and cockroach droppings.

Immune System 101
The immune system helps defend the body against attacks by substances that are foreign invaders. In an allergy, the substance that sets the immune system in motion is an allergen. This substance is normally harmless. But in an allergic person, the immune system mistakes it for a threat.

Antibodies are molecules made by the immune system to help capture unwelcome invaders. One such antibody is known as immunoglobulin E (IgE). Here's how it works:

  • When an allergy-prone person first comes across a certain allergen, the body makes IgE in response. There are different types of IgE, and each is specific to one particular allergen.
  • The next time the person runs across that allergen, the IgE captures it. This capture sets off the release of chemicals that cause the symptoms of an allergic reaction. In a person with allergic asthma, the airways become swollen and inflamed. That leads to coughing, wheezing and other asthma symptoms.

Is It Allergic Asthma?
Could your asthma be triggered by allergies? These questions can help you decide. Discuss your answers with your health care provider, who can make a definite diagnosis.

  • Are your asthma symptoms triggered or worsened when you come into contact with:
    -Certain foods?
    -Cockroaches?
    -Dogs or cats?
    -House dust?
    -    Indoor mold or mildew?
  • Do you have allergy symptoms, such as sneezing, itchy or watery eyes, and a stuffy or runny nose, that last for more than 10 days at a time?
  • Do your asthma symptoms act up when pollen and mold counts are high?
  • Do your asthma symptoms get worse every year in the spring or fall?
  • Have either of your parents had allergies or asthma?

You and your health care provider can work together to find the best treatment to control your symptoms. Your provider can also offer tips on reducing your contact with allergens.

For More Information
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