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Allergen. A substance, such as pollen, mold, dust mites, or animal dander, that can cause an allergic response.
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Bronchoconstriction. A tightening of the muscles around the airways, narrowing the airways and making breathing difficult.
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Inflammation. A swelling and irritation in the airways of the lungs common in asthma.
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Inhaler. A device that delivers asthma medication to the lungs.
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Mucus. A wet, sticky substance that is produced by the airways when inflamed or infected.
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Peak flow. A measure of how hard and fast air can be expelled from the lungs.
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Triggers, irritants or allergens, such as weather conditions, fumes, pollution or exercise, that can cause an asthma attack.
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Wheezing. The whistling or squeaky sound created by the airways.