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Allergies
An allergy is a reaction in the body to a normally harmless substance. Usually the immune system functions as the body’s defense against invading bacteria and viruses. In most allergic reactions, the immune system is responding to a false alarm. When you inhale an allergen (a substance that causes allergies), your immune system releases chemical substances that inflame the linings of your nose, sinuses, eyelids, lungs, and eyes. This causes itching, sneezing, runny nose, watery eyes, coughing, and wheezing.
Causes
Pollen
Mold
Dust Mites
Pets
Symptoms
Treatment
Medications
Allergy Shots
Self-Care
Related topics
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What to do About Allergies
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| Occasional allergy symptoms (itchy eyes, nose, and throat; runny nose; cough) |
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| Symptoms that last more than 2 weeks |
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| Allergy symptoms that occur at the same time each year |
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| Wheezing, shortness of breath |
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Resources
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