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Under-the-Tongue Hay Fever Pills Offer Little Benefit: Study
For serious grass allergy, shots may be more effective, researcher says
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What Is an Allergy?
Allergies are an abnormal response of the immune system. People who have allergies have an immune system that reacts to a usually harmless substance in the environment. This substance (pollen, mold, and animal dander, for example) is called an allergen.
Allergies are a very common problem, affecting at least two out of every 10 Americans.
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